WorldWideScience

Sample records for aquiculture

  1. DISSOLVED AND PARTICULATE ORGANIC CARBON IN YANTAI SISHILI BAY AQUICULTURE WATERS

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Investigation of dissolved organic carbon (DOC) and particulate organic carbon (POC) at 12 stations in Yantai Sishili Bay in May, August, and November of 1997 and March and May of 1998 showed that DOC concentrations varied from 1.14 mg/L to 5.35 mg/L; that the average values at all stations in each cruise varied from 1.52 mg/L to 2.12 mg/L; that POC concentrations varied from 0.049 mg/L to 1.411 mg/L; and averaged 0.159 mg/L to 0.631 mg/L in each cruise. Horizontal distribution of DOC was influenced by factors such as continental input, organism activity, temperature, aquiculture environment, etc. The higher POC concentration occurred along the coast. The vertical distribution of DOC and POC changed obviously in spring and summer, but not obviously in autumn and winter. DOC concentration was highest in summer and POC in spring; both were lowest in winter. The seasonal change of DOC was consistent with primary productivity seasonal variation, and that of POC was consistent with chlorophyll-a seasonal variation. The seasonal change trend of the C/N ratio of dissolved organic matter was obvious, but the C/N ratio of particulate organic matter had no such trend.

  2. Quantitative Detection of Trace Malachite Green in Aquiculture Water Samples by Extractive Electrospray Ionization Mass Spectrometry

    Science.gov (United States)

    Fang, Xiaowei; Yang, Shuiping; Chingin, Konstantin; Zhu, Liang; Zhang, Xinglei; Zhou, Zhiquan; Zhao, Zhanfeng

    2016-01-01

    Exposure to malachite green (MG) may pose great health risks to humans; thus, it is of prime importance to develop fast and robust methods to quantitatively screen the presence of malachite green in water. Herein the application of extractive electrospray ionization mass spectrometry (EESI-MS) has been extended to the trace detection of MG within lake water and aquiculture water, due to the intensive use of MG as a biocide in fisheries. This method has the advantage of obviating offline liquid-liquid extraction or tedious matrix separation prior to the measurement of malachite green in native aqueous medium. The experimental results indicate that the extrapolated detection limit for MG was ~3.8 μg·L−1 (S/N = 3) in lake water samples and ~0.5 μg·L−1 in ultrapure water under optimized experimental conditions. The signal intensity of MG showed good linearity over the concentration range of 10–1000 μg·L−1. Measurement of practical water samples fortified with MG at 0.01, 0.1 and 1.0 mg·L−1 gave a good validation of the established calibration curve. The average recoveries and relative standard deviation (RSD) of malachite green in lake water and Carassius carassius fish farm effluent water were 115% (6.64% RSD), 85.4% (9.17% RSD) and 96.0% (7.44% RSD), respectively. Overall, the established EESI-MS/MS method has been demonstrated suitable for sensitive and rapid (<2 min per sample) quantitative detection of malachite green in various aqueous media, indicating its potential for online real-time monitoring of real life samples. PMID:27529262

  3. Aquiculture remote monitoring system based on IOT Android platform%基于物联网Android平台的水产养殖远程监控系统

    Institute of Scientific and Technical Information of China (English)

    李慧; 刘星桥; 李景; 陆晓嵩; 宦娟

    2013-01-01

    the TXT file is saved (such as year-month-data-hour-minute-second) in order to avoid the problem of having the file overwritten by a file with the same name file. Therefore, the user needs not designate the name of the saving TXT file. To the Android application, many control nodes can be controlled remotely. The system adopts CC2430 as the underlying management chip. Temperature measurement accuracy of the system can reach 0.5℃. In addition, pH measurement accuracy of the system can reach 0.3. A good control algorithm can achieve good control precision. In our system, in order to obtain more control precision, an intelligent fuzzy PID control algorithm is applied in the remote MCU control system. Dissolved oxygen is a very important parameter in aquiculture. In the system dissolved oxygen control precision can be controlled within ±0.3 mg/L. Moreover, the SOKCET communication is designed in an independent thread to the system. Thus, the reaction of the control system is very sensitive. The function of the system is not limited by time, regional, and climate conditions. The interface of the application is designed in the Android Mobile phone, so the user can handle the application flexibly and conveniently, and the user can browse data from the mobile phone, send remote control commands, and control the bottom water, pump water supply pump, and aerator in any location with an Internet connection. The IP address is exported into a SQLite database, so the IP data can be obtained automatically from the database by the system after the application is started, and it does not need input from the user repeatedly. Many mobile phone clients of the system can share a single server. Thus, the system has a very high price-performance ratio. After practical testing of the system in the Changdang Lake experiment area in Liyang, Jiangsu province, the indicators have reached the requirements, and the control effect of the system is very good. The system has the advantages of

  4. 水产养殖物联网监控系统的设计%The Design of Aquiculture Water Quality Monitoring and Control System Based on Internet of Things

    Institute of Scientific and Technical Information of China (English)

    杜炎城; 陈威; 曹佃国

    2013-01-01

    针对蓝色经济区水产养殖粗放式管理现状,设计了新型水产养殖物联网监控系统。该系统的传感器节点负责水质数据采集功能,并通过Zigbee无线传感器网络将数据发送给汇聚节点,汇聚节点通过GPRS模块接入Internet网络,将数据传送至远程监控中心。同时监控中心设置的各项参数通过Internet和汇聚节点传到采用PIC单片机的控制节点,实现水质的自动控制。监测中心软件采用C++ Builder开发,为用户提供形象直观的实时数据监测平台。经过在日照市某水产养殖基地的试用,系统性能满足水产养殖水质监控的应用要求。%A new water quality monitoring and control system based on internet of things is designed in order to change the current situation of traditional extensive management in aquiculture. The proposed system uses sensor nodes to acquire data of water temperature, pH value, and dissolved oxygen concentration. The sink nodes are used to collect data from the sensor nodes through a wireless sensor network. A remote monitoring and control center is responsible to process data downloaded from the sink nodes through GPRS and internet. The control nodes are responsible to operate actuators exactly according to the operation instructions from the center. The monitoring and control software, which is compiled using C++ builder, can provide users with a real-time data monitoring and control platform with visual images. This system is operating in a aquiculture base in Rizhao. The results demonstrate that the system features higher acquisition frequency, smaller size, lower cost, and good flexibility, and can implement real-time monitoring and control of water quality parameters in a wide range of water types.

  5. ARCHETYPES OF CONSTRUCTED WETLANDS SYSTEMS FOR TREATMENT OF AQUICULTURE EFFLUENT = PROTÓTIPOS DE SISTEMAS CONSTRUÍDOS DE ÁREAS ALAGADAS PARA TRATAMENTO DE EFLUENTES DE PISCICULTURA

    Directory of Open Access Journals (Sweden)

    Roberto Naves Domingos

    2008-01-01

    Full Text Available The aquaculture is an activity that finishes causing eutrofization them water bodies in which its effluent one is launched, decurrent of the nutrition and prophylaxes used in its reservoirs. The components that cause greater problems are those that contain nitrogen and phosphorus. The management used in the aquiculture must be guided in such way to prevent the eutrofization and to provide treatment of effluent and water reuse. Constructed wetland system (CWS’s has been efficient for treatment of waters, effluent and domestic and industrial sewer, being pertinent so that physical, chemical and biological processes occur similar as they happen in natural ecosystems. Initially some archetypes of CWS’s had been simulated, in laboratory scale, using 46 L reservoirs, with aeration system, being vegetated with a polyculture of aquatic macrophytes, for effluent treatment of tanks of Tilapia of the Nile creation. The analyzed types of support matrix had been: soil of cerrado area; soil plus brick fragments (1:1 (aggregate; soil plus brick fragments (3:1; and brick fragments. The results had demonstrated that CWS’s contend soil plus aggregate was efficient to treat the effluent one used in this study. After the stabilization of CWS’s, better efficiencies had been observed in the system only contend brick fragments or only soil, depending on the analyzed parameter. = A piscicultura é uma atividade que acarreta o processo de eutrofização nos corpos de água nos quais seu efluente é lançado, decorrente da nutrição e profilaxias utilizadas em seus tanques de criação. Os compostos que contribuem para o processo de eutrofização são aqueles que contêm nutrientes, como nitrogênio e fósforo. Os manejos utilizados na piscicultura devem ser orientados de tal modo a se evitar o processo de eutrofização, e contemplar tratamentos dos efluentes. Sistemas construídos de áreas alagadas Cosntructed Wetland System - CWS’s têm mostrado efici

  6. Simultaneous determination of arsenic and mercury of sea-water aquiculture base environment medium by flow injection Hydride Generation-Atomic Fluorescence Spectrometry%流动注射氢化物发生原子荧光光谱法同时测定海水养殖基地环境介质As和Hg

    Institute of Scientific and Technical Information of China (English)

    黄月芳; 曹军; 丁智; 仇东辉; 郝玉凤

    2012-01-01

    应用氢化物发生原子荧光光谱技术,同时测定海水养殖基地环境介质底泥、海水和水产品中微量As和Hg.研究了载流、KBH4浓度对As和Hg测定的影响.在最佳实验操作条件下,As和Hg检出限分别为0.028 3 μg/L、0.017 4 μg/L.底泥中As和Hg的加标回收率分别为89.7%~ 112.6%和91.7% ~ 110.8%,相对标准偏差分别为2.7%~5.3%和2.2% ~4.3%;海水中As和Hg的加标回收率分别为90.2%~ 101.8%和90.0%~ 108.8%,相对标准偏差分别为3.1%~5.6%和2.1%~4.5%;水产品中As和Hg的加标回收率分别为89.6%~ 102.0%和89.2.0%~ 108.0%,相对标准偏差分别为2.6%~4.9%和1.7%~4.4%.%A systemic method for simultaneous determination of arsenic and mercury of sediment, seawater and fishery product in sea-water aquiculture base was developed by Hydride Generation-double channel Atomic Fluorescence Spectrometry ( HG-AFS). Effects of flowing acid and concentration of KBH4 solution on the determination of As and Hg were studied and optimized. The detection limits were found to be 0. 028 3 μg/L and 0. 017 4 μg/L for As and Hg, respectively. The proposed method was applied to the determination of As and Hg. The values of RSD's ( n = 10) were in the ranges of 2. 7% -5.3%(As) and2.2% -4.3%(Hg) in sediments, 3.1% -5.6%(As) and 2.1% -4.5%(Hg) in seawater, 2.6% -4.9%(As) and 1.7% -4.4% (Hg) in fishery product, respectively. Result s of recovery test were found in the ranges of 89. 7% -112. 6% (As) and 91.7% -110.8% (Hg) in sediments, 90.2% -101. 8% (As) and 90.0% -108.8% (Hg) in seawater, 89.6% -102.0% (As) and 89. 2.0% -108.0% (Hg) in fishery product, respectively.

  7. Recherches et formation en hydrobiologie - pêches - aquicultures au Mali

    Directory of Open Access Journals (Sweden)

    Reizer, C.

    1989-01-01

    Full Text Available Researches and training in Hydrobiology Fisheries Aquaculture in Mali. A study on local goats in Burundi, specially the growth rate of the kid during the first weeks after birth, has been undertaken. Milk yield has been monitored to establish milking and suckling abilities of local goats. The results of daily controls have given a milk yield average of 511 g/day up to day 56 post partum. Lactation yield has been significantly affected by the doe's weight. During the first month, heavy goats have produced the equivalent of a glass of milk per day (about 200 ml for human consumption in addition to the quantity taken up by the kids. The daily weight gain of 54.05 g recorded from birth to 28 days of age in youngs is low, probably due to the limited quantity of milk available to them. Nevertheless local kids show an excellent conversion ratio of suckled milk, with a value of 3.93 kg of milk to produce 1 kg liveweight during the first 28 days, representing a very high food conversion.

  8. DISSOLVED AND PARTICULATE ORGANIC CARBON IN YANTAI SISHILI BAY AQUICULTURE WATERS

    Institute of Scientific and Technical Information of China (English)

    赵卫红; 王江涛; 焦念志; 赵增霞

    2001-01-01

    Investigation of dissolved organic carbon (DOC) and particulate organic carbon (POC) at 12 stations in Yantal Sishili Bay in May, August, and November of 1997 and March and May of 1998 showed that DOC concentrations varied from 1.14 mg/L to 5.35 mg/L; that the average values at all staticrLs ineach entise varied from 1.52 mg/L to 2.12 mg/L; that POC concentrafions varied from 0.049 mg/L to 1.411mg/L; and averaged 0.159 mg/L to 0.631 mg/L in each cruise. Horizontal distribution of DOC was influ-enced by factors such as continental input, organism activity, temperature, aquieulture environment, etc. The higher POC concentration occurred along the coast. The vertical distribution of DOC and POC changed obviously in spring and summer, but not obviously in autumn and winter. DOC concentration was highest in summer and POC in spring; both were lowest in winter. The seasonal change of DOC was con-sistent with primary productivity seasonal variation, and that of POC was consistent with ehlorophyll-a sea-sanal variation. The seasonal change trend of the C/N ratio of dissolved organic matter was obvious, but the C/N ratio of particulate organic matter had no such trend.

  9. Métodos de estudos de sustentabilidade aplicados a aquicultura Sustainable development in aquiculture: methodology and strategies

    Directory of Open Access Journals (Sweden)

    Márcia Noélia Eler

    2007-07-01

    Full Text Available O objetivo deste artigo é introduzir reflexões sobre as estratégias de interconexão da aqüicultura no contexto sócio-ambiental, conclamando os atores comprometidos com o setor a pesquisar e utilizar métodos de viabilidade em conformidade com o princípio da sustentabilidade. Sendo que o conceito de desenvolvimento sustentável defendido é aquele que tem como paradigma a inclusão da dimensão social e ambiental desde o estágio de planejamento até a operação. Para tanto, a metodologia da avaliação do ciclo de vida do produto, critérios de avaliação de impacto ambiental, assim como, a adoção da bacia hidrográfica como unidade de gestão participativa, são instrumentos apresentados tendo a piscicultura de água doce como exemplo. A Legislação ambiental brasileira é apresentada como critério norteador e determinante na busca do desenvolvimento sustentável.The objective of this article is to introduce the reader to a reflection about the strategies of interconnection of the aquaculture in the human-environmental context, shouting the committed actors with the sector it research and utilize approaches of feasibility in conformity with the beginning of the sustainability. Sustainability is a complex idea and an abstract concept that provides a framework for interdisciplinary dialogue, interaction and research. The Principle of Sustainable Development as it was endorsed in the Rio-Declaration of 1992, interpreted as comprising the inter-relation of natural and technological aspects on the one hand, with socio-economic and value-based considerations on the other. This study applies a consequential approach to system delimitation and includes future scenarios. The latter are used to predict the impact potential over a longer time span. Also, the methodology for life cycle impact assessment (LCA, environmental impact evaluation criteria, as well as, the adoption of the basin as unit of management participatory. Interconnecting each aquaculture process, Brazilian environmental Legislation is as a criteria determinant in the search of the sustainable development.

  10. Performance and ecological design of closed re-circulating aquiculture system%封闭循环水集约化养殖池塘的生态设计与性能研究

    Institute of Scientific and Technical Information of China (English)

    唐天乐; 杨晓姝; 唐文浩

    2011-01-01

    在分析传统池塘养殖和工厂化养殖生态系统结构与功能缺陷的基础上,运用生态补偿和环境补偿原理对传统养殖池塘的结构、功能与过程进行了生态设计,并在实际生产条件下对新型封闭循环水集约化水产养殖池塘进行了性能测试.结果表明,封闭循环水集约化水产养殖池塘的结构有利于垂直混合增氧、集污和引污,具有持续高效地分离污染物的净水功能,水环境稳定利于水产动物生长,长期运行并不造成硝态氮、氨氮等的积累,可不洗塘、不肥水、不换水、不排水,达到废水零排放,对于传统池塘养殖生产方式转变和产业可持续发展具有重大意义.%Based on the analysis of ecosystem structure and functional defects of the traditional ponds culture and factory farm,a ecological design for the traditional ponds 'structure, function and process by the principle of ecological and environment compensation, anda performance tnst in the new type closed re-circufating intensive aquaculture ponds under the conditions of actual production were done.The results showed that the structure of the new type ponds was aided the vertical structure of mixed aerobic,collecting and excluding sewage, and it hod the performance of the high continuous function to purify water and separate pollutants.The stability of water environment was good for the growth of the aquatic animals, and its long-term operation would not accumulate NO3 -N and NH4-N.The users didn't need to wash the ponds, fertilize,change and drain the water.So,the new type ponds could be zero discharge of wastewater ,and it might be significant to change the traditional modes in production in pond culture and good for the industrial sustainable development.

  11. 池塘循环水养殖模式构建及净化湿地面积配比%Modeling of recirculating water aquiculture system in pond and proportion of purification wetlands area

    Institute of Scientific and Technical Information of China (English)

    彭刚; 陆全平; 郝忱; 刘伟杰; 严维辉; 唐建清; 童军

    2013-01-01

    建立了在池塘养殖中具有较好净化效果的净化湿地和养殖池的面积配比公式,构建了一种具有较高生产推广价值的池塘循环水生态养殖净化系统,系统由生态养殖区、湿地净化区、生态沟渠、尾水汇集区、净水汇集区、动力设备、潜流坝等组成,养殖尾水经过系统净化处理后可循环使用或达标排放.

  12. Environmental cost of pond aquiculture in Shanghai: an empirical analysis based on double-bounded dichotomous CVM method%上海池塘养殖环境成本——基于双边界二分式CVM法的实证研究

    Institute of Scientific and Technical Information of China (English)

    唐克勇; 杨正勇; 杨怀宇; 范晓赟

    2012-01-01

    池塘养殖具有食品供给、空气质量调节、文化服务等多重功能,但在其生产过程中也会产生环境成本.正确认识池塘养殖的正、负生态服务价值,对于避免养殖生产过程中存在的盲目和短视、保持水产养殖业本身的可持续发展、促进水产养殖经济与环境的和谐发展具有重要的现实意义.依据双边界二分式CVM法,通过随机抽样调查法获得当地居民对于环境污染时的受偿意愿(WTA)水平,利用STATA10.0软件定量核算了2010年上海环淀山湖地区的池塘养殖环境成本为1982.26万元/a,约合5105元·a-1·hm-2).研究表明,居民家庭收入、受教育程度、年龄等社会经济因素对居民的环境污染受偿意愿具有显著性的影响,但其具体的影响力大小和方向还有待进一步的探讨.研究同时表明,双边界二分式CVM法具有较强的稳定性,政府应综合考虑各种因素,制定并执行针对性、公平性的生态补偿政策.%At present, academics on the ecological services value research focus on the positive aspects, while the negative service values, such as environment cost, is received little attention. Pond aquaculture performs multiple functions, including aquatic products supply, air quality adjustment as well as culture service and so forth. As a kind of special ecological system, the pond aquaculture also has the environment cost in its production process. A clear cognition of the positive and negative ecological services values in pond aquaculture will be a great significance to avoid the blindness and short-term version in the process of production, keep the development of pond aquaculture sustainable and promote the development of aquaculture in harmony with the environment protection. This paper firstly adopts double-bounded dichotomous contingent valuation method (CVM) and random cluster sampling method to attain the local residents' willing to accept (WTA) , 354 questionnaires were sent out and 340 effective questionnaires were returned, the effective response rate was therefore 96. 05%. Then the paper adopt Logit and Biprobit regression models of econometrics and STATA10.0 software was utilized for analyzing the environment cost of pond aquaculture in the DianShan Lake, Shanghai. Through these methods adopted, the paper has summarized these results as following; 1) The ecological compensation E(WTA) standard of Shanghai residents for the environment pollution damage is 104. 89 RMB Yuan per person in Logit model and 121. 89 RMB Yuan per person in Biprobit model; 2) In 2010, the total pond aquaculture environment cost is about 19. 8226 millionYuan, namely 5105 RMB Yuan*a -hm ) ; 3) The latest research released that several economic social factors such as the income of the household, education background and age lay a great influences on residents' willingness to accept the ecological compensation, but these factors will cause no strict trend influences on the residents' WTA at present. Such as the income of the household, education background of residents affect the E (WTA), which shows a positive effect on the relationship of E (WTA) standard. The 18-45 years old residents pay more attention to the environmental protection. If government takes the ecological compensation policy, they may be the main stakeholders. The paper also mentions the discussions; 1) Because these social economic factors have common influences on the E (WTA) standard of residents, but the size and direction of these influences are not absolute, it needs to do a further study based on the actual situation to establish a stable structure model to determine the size and direction of these influences; 2) By the LR and WALD test, the research indicates that the double-bounded dichotomous discrete CVM has a stronger stability than the single-bounded dichotomous discrete CVM, thus the double-bounded dichotomous discrete CVM can become a relatively stable research method for ecological system service value study; 3 ) The environment property right should be the applicable standard to WTA and WTP. Meanwhile, improving the questionnaire design accuracy, adjusting the research course etc can overcome the differences between WTA and WTP effectively; 4) Government should make and conduct a make-up policy for ecological compensation according to the real situation in order to achieve the environmental equity and sustainable development.

  13. Composição e cinética de degradação do ácido ascórbico em rações para aquicultura Composition and degradation kinetics of ascorbic acid in rations for aquiculture

    OpenAIRE

    Ricardo de Figueiredo Guilherme; José Marcelino Oliveira Cavalheiro; Olivaldo Lacerda Brasileiro; João Paulo de Sousa Prado; Thiago Brandão Cavalheiro

    2009-01-01

    O crescente desenvolvimento da aquicultura nos últimos anos vem despertando o interesse de se estudar a melhor forma de utilização das rações, visto que estas podem elevar em até 60% o custo total de produção. O nível de inclusão de ácido ascórbico em uma dieta deve considerar a variação da matéria-prima, as interações entre nutrientes e as perdas no processamento, estocagem e lixiviação. O estudo foi conduzido para avaliar a estabilidade térmica, fotoquímica e lixiviação do ácido ascórbico e...

  14. Outlook on China's Food Standards

    Institute of Scientific and Technical Information of China (English)

    2004-01-01

    @@ The output of many kinds of foods in China have stood first on the world list, such as fruits, vegetables,meats, rape oil, aquiculture, etc. But China's export volume is minor. For example, the rate of apples exported is less than 1% of the total production, accounting for 6% of the world export volume. This results from quality and safety concerns, particularly the latter one. In order to improve this situation, central government has issued Project of Farming Region for Superior Agricultural Products (2003-2007) recently. The project says that 1118 standardized demonstration regions (base) of producing superior agricultural products will be established within the next 5 years. The superior agricultural products include wheat, special-purpose corn, high oil soy been, cotton, "double-low" rape, "double-high″ sugar cane, citrus fruit, apples,beef cattle, mutton sheep, milk, aquiculture etc.

  15. Compounded Ecological Ditch used for Improving Fishpond Water

    Directory of Open Access Journals (Sweden)

    Jian-qiang Zhu

    2012-10-01

    Full Text Available In order to guarantee a good water quality for freshwater aquiculture in fishpond, compounded ecological was constructed around the fishpond and an experimental study was made that it improves fishpond water quality. A compounded ecological ditch based on the simple transformation of general ditch, has a regular cross-section of isosceles trapezoid, with a lining of permeable brick where ceramsite stroma etc were filled in the grids of the permeable bricks and some hydrophytes were grown in the ditch, including spatterdock, Myriophyllum verticillatum, Vallisneria natans (Lour. Hara etc. According to the study, after aquiculture wastewater treated by the compounded ecological ditch, the water quality will be improved obviously; the important sign is an increase for DO and apparent decrease for TN, TP, NO3 --N, NH4 +-N and CODMn. The removal rate (Rm of the main substances is significantly relative to their initial Concentration (C0 and the distance of them carried by flowing water (Df. When compounded ecological ditch is used to purify fishpond water, besides slow velocity of the flow (6-9 m/h, the ditch must have a certain length which is suggested to be more than 100 m. On the other hand, a good effect will be procured in fishpond water purification only if an initial concentration exceeds 2.0 mg /L for TN, 0.6 mg/L for NO3 --N and 8.0 mg/L for CODMn.

  16. Urbanização e gestão do litoral centro-sul do estado de Santa Catarina

    Directory of Open Access Journals (Sweden)

    M. Scherer

    2006-01-01

    Full Text Available Thirty six municipalities form the littoral of Santa Catarina State. These municipalities are divided in five sectors: north, center-north, center, center–south and south. Six municipalities belong to the center-south littoral and in this sector is located the bigger coastal lagoon chain of the State. Laguna is the faster growing municipality in this region and has the highest number of inhabitants. The rapid and non-organized urbanization of this area has been causing remarkable environmental impacts such as water pollution, sand dune erosion, loss of coastal vegetation and biodiversity. Activities such as prawn farms, agriculture, tourism and urbanization are the most impacting activities. For a sustainable development of the region some actions should be taken, such as: sewage treatment, urban planning,aquiculture zoning, coastal ecosystems preservation, development and implementation of management plan for conservation areas, environmental laws enforcement.

  17. 水库网箱养鱼环境经济学分析%Environmental Economics Analysis of Raising Fish in Net Box in Reservoir

    Institute of Scientific and Technical Information of China (English)

    林道辉; 杨志峰

    2001-01-01

    This paper dealed with the influences of raising fish in net boxon the quality of water of aquiculture area and the whole Miyun Reservoir. We also analyzed its cost and benefit and pointed out that it was not worthwhile to raise fish in net box in Miyun Reservoir in the sight of environmental economics.%以密云水库为研究对象,分析了水库网箱养鱼对水库局部水域水质和水库出水水质的影响程度,并从环境经济学角度对水库网箱养鱼进行了费用-效益分析,指出应禁止在密云水库进行网箱养鱼作业。

  18. Winter habitat selection of red-crowned crane (Grus japonensis)

    Institute of Scientific and Technical Information of China (English)

    张洪海; 杨月伟

    2000-01-01

    This paper studied the winter habitat selection of red-crowned cranes (Grus japonensis) in Yancheng National Natural Reserve, Jiangsu Province. There were six types of habitat used by red-crowned cranes, i.e. salt-works, aquiculture ponds, reed lands, grassy tidal lands, salting wormwood lands and wheat fields. The wheat field was a new type of habitat used by red-crowned cranes. More than 70 percent of red-crowned cranes chose grassy tidal lands, salting wormwood lands, and reed lands as their most important habitats. In recent years, the distribution of red-crowned cranes moved southward gradually. Red-crowned cranes prefer artificial or semi-artificial wetlands rather than original wetlands, successive distribution was broken into fragments.

  19. Depuration of paralytic shellfish toxins in Japanese scallop (Patinopecten yessoensis) in natural environment

    Institute of Scientific and Technical Information of China (English)

    SONG Tao; LIU Lei; SONG Xiaoping; LIANG Yubo; ZHUANG Guohong

    2015-01-01

    To study the paralytic shellfish toxins (PSTs) depuration in Japanese scallopPatinopecten yessoensis in natural environment, Japanese scallops naturally contaminated with paralytic shellfish poisoning (PSP) toxins in the Dayao Bay in the northern Huanghai Sea are transited to Qipanmo waters in the Bohai Sea of no reported PSTs incidents. The levels and profile of PSTs during 30-day depuration are detected by the high performance liquid chromatography with fluorescence detection (HPLC-FLD). The results show that the toxicity of the PSTs in soft tissues decreases to a relatively low level at Day 9. Moreover, the depurated ratio at the early stage of the PSTs depuration is higher than that at the later stage. The toxicity analysis of dissected organs reveals that the digestive gland is the most contaminated PSTs part, which is of important implication for the human health and scallop aquiculture. The mortality of Japanese scallops during PSTs depuration experiment is relevant to PSTs level in the soft tissue.

  20. STUDY OF RED TIDE PREDICTION MODEL FOR THE CHANGJIANG ESTUARY

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    This paper based on field data (on red tide water quality monitoring at the Changjiang River mouth and Hutoudu mariculture area in Zhejiang Province from May to August in 1995, and May to September in 1996) presents an effective model for short term prediction of red tide in the Changjiang Estuary. The measured parameters include: depth, temperature, color diaphaneity, density, DO, COD and nutrients (PO4-P, NO2-N, NO3-N, NH4-N). The model was checked by field-test data, and compared with other related models.The model: Z=SAL-3.95 DO-2.974 PH-5.421 PO4-P is suitable for application to the Shengsi aquiculture area near the Changjiang Estuary.

  1. Editorial of the First Edition of the “Ambiente e Água” Scientific Journal

    Directory of Open Access Journals (Sweden)

    Getulio Teixeira Batista

    2007-06-01

    Full Text Available This release is the first edition of this new interdisciplinary scientific journal, named Ambiente e Água - An Interdisciplinary Journal of Applied Science, Ambi-Agua, in short. The journal was so named to characterize the emphasis in publishing scientific papers in the areas of Environmental Sciences and Water Resources, once these scientific areas typically integrate systems and processes of the ecosphere (biosphere and atmosphere. Specifically, this Journal will publish scientific findings in the area of Hydrology, Hydrogeology, Environmental Engineering and Sanitation, Forest Engineering and Forest Resources, Ecology, Aquiculture, Oceanology and Fishing Resources, Agronomy, Agrometeorology and Agricultural Engineering, Global Change, Fishing Engineering and Zootechnology, Geography, Geology, Environmental Science, Environmental Legislation and Pollution, among others. As well as, papers in the areas of Remote Sensing, Geotecnologies and Spatial Analysis concerned with the study of water, environment and public health.

  2. An Operational Coastal Forecasting System in Galicia (NW Spain)

    Science.gov (United States)

    Balseiro, C. F.; Carracedo, P.; Pérez, E.; Pérez, V.; Taboada, J.; Venacio, A.; Vilasa, L.

    2009-09-01

    The Galician coast (NW Iberian Peninsula coast) and mainly the Rias Baixas (southern Galician rias) are one of the most productive ecosystems in the world, supporting a very active fishing and aquiculture industry. This high productivity lives together with a high human pressure and an intense maritime traffic, which means an important environmental risk. Besides that, Harmful Algae Blooms (HAB) are common in this area, producing important economical losses in aquiculture. In this context, the development of an Operational Hydrodynamic Ocean Forecast System is the first step to the development of a more sophisticated Ocean Integrated Decision Support Tool. A regional oceanographic forecasting system in the Galician Coast has been developed by MeteoGalicia (the Galician regional meteorological agency) inside ESEOO project to provide forecasts on currents, sea level, water temperature and salinity. This system is based on hydrodynamic model MOHID, forced with the operational meteorological model WRF, supported daily at MeteoGalicia . Two grid meshes are running nested at different scales, one of ~2km at the shelf scale and the other one with a resolution of 500 m at the rias scale. ESEOAT (Puertos del Estado) model provide salinity and temperature fields which are relaxed at all depth along the open boundary of the regional model (~6km). Temperature and salinity initial fields are also obtained from this application. Freshwater input from main rivers are included as forcing in MOHID model. Monthly mean discharge data from gauge station have been provided by Aguas de Galicia. Nowadays a coupling between an hydrological model (SWAT) and the hydrodynamic one are in development with the aim to verify the impact of the rivers discharges. The system runs operationally daily, providing two days of forecast. First model verifications had been performed against Puertos del Estado buoys and Xunta de Galicia buoys network along the Galician coast. High resolution model results

  3. 广东沿海赤潮发生与城市发展的关系%A relationship between red tide outbreaks and urban development along the coasts of Guangdong Province

    Institute of Scientific and Technical Information of China (English)

    刘晓南; 王为

    2004-01-01

    Red tides are one of the main coastal catastrophic events in Guangdong Province of southern China. The comparison between the number of red tide events and the development indexes of cities along the coasts of the province shows that the regional differences in red tide outbreaks has close relations with the coastal urban developments. The cause for an initiation of red tide blooms may be natural factors, while wastewater caused by the fast development of population, industry and aquiculture of the coastal cities enhanced the blooms. It may explain why the two periods of frequent outbreaks of the red fides over the last two decades matched the urban developments in the coastal areas of Guangdong not only spatially but also temporally. The red tides in the ftrst period were restricted only to the coasts of middle Guangdong, where urbanization process was at a higher speed than the other coastal areas of the province. In the second period, fast development of the coastal cities in eastern Guangdong led to an increase in the occurrence of red fides in local sea areas of the same coasts.

  4. [Determination of endosulfan pesticide residues in Litopenaeus vannamai by capillary gas chromatography].

    Science.gov (United States)

    Liu, Xiaosong; Huang, Daxin; Lu, Shengyu

    2007-05-01

    A method is described for the determination of endosulfan pesticide residues in Litopenaeus vannamai by capillary gas chromatography. The residues of alpha-endosulfan and beta-endosulfan were extracted from the sample with ethyl acetate, and the extract was cleaned up using a neutral alumina column and an active carbon column after concentrated and then eluted with a mixture of n-hexane-ethyl acetate (1 : 1, v/v). During the process of purification, the flow rate of eluent was controlled within 3 mL/min. The eluate was collected and evaporated to 1 mL for analysis. The determination was performed on a gas chromatograph equipped with an electron capture detector. The retention time was used for qualification and the external calibration standard was used for quantitation. The results obtained showed that the recoveries were 80.5% - 97.3% for alpha-endosulfan and 81.1% - 109.5% for beta-endosulfan. The limit of detection (LOD) was 0. 002 mg/kg, and the limit of quantitation (LOQ) was 0. 007 mg/kg for both. The precision of the method, expressed as the relative standard deviation for the within-laboratory repeatability, was generally below 8.5%. The method was used for the analysis of Litopenaeus vannamai samples from Guangxi Province, a Litopenaeus vannamai aquiculture area in south China. PMID:17679437

  5. Nutrient and chlorophyll a anomaly in red-tide periods of 2003-2008 in Sishili Bay, China

    Institute of Scientific and Technical Information of China (English)

    HAO Yanju; TANG Danling; YU Long; XING Qianguo

    2011-01-01

    Sishili Bay is the most important aquiculture and tourism area for the city of Yantai, China; however, red tides occurred frequently and have caused huge economic losses in this bay in recent years. To gain a better understanding of the local ecological environments in the bay, we conducted this research between 2003 and 2008 to analyze variations in nutrients and chlorophyll (chl-α) during high frequency red tide period (May to September). The results show that the chl-α concentration increased from 2.70 in 2003 to 7.26 mg/m3 in 2008, while the concentration of total inorganic nitrogen (TIN) and silicate (SiO3-Si) increased lineally from 5.18 and 1.45μmol/L in 2003 to 18.57 and 9.52 μmol/L in 2008, respectively, and the annual phosphate (PO4-P) varied between 0.15 and 0.46 μmol/L. Special attention was given to a red tide in August 2007 occurred when water temperature was high and nutrient concentrations increased sharply because of a heavy rainfall. Overall, the results show the P limitation in Sishili Bay, and reveal that red tides were caused by eutrophication from terrestrial inputs and local warm weather, particularly during rainy periods. Therefore, to control red tide, greater efforts should be made to reduce sewage discharges into Sishili Bay, particularly during rainfall seasons.

  6. A relationship between red tide outbreaks and urban development along the coasts of Guangdong Province

    Institute of Scientific and Technical Information of China (English)

    LIUXiaonan; WANGWei

    2004-01-01

    Red tides are one of the main coastal catastrophic events in Guangdong Province of southern China. The comparison between the number of red tide events and the development indexes of cities along the coasts of the province shows that the regional differences in red tide outbreaks has close relations with the coastal urban developments. The cause for an initiation of red tide blooms may be natural factors, while wastewater caused by the fast development of population, industry and aquiculture of the coastal cities enhanced the blooms. It may explain why the two periods of frequent outbreaks of the red tides over the last two decades matched the urban developments in the coastal areas of Guangdong not only spatially but also temporally. The red tides in the first period were restricted only to the coasts of middle Guangdong, where urbanization process was at a higher speed than the other coastal areas of the province. In the second period, fast development of the coastal cities in eastern Guangdong led to an increase in the occurrence of red tides in local sea areas of the same coasts.

  7. Discussion on 'Aquatic Animal Nutrition and Feed Science' Teaching Experience%浅谈水产专业“水生动物营养与饲料学”教学体会

    Institute of Scientific and Technical Information of China (English)

    雷宇杰; 伦峰; 彭新亮; 龚静

    2012-01-01

    'Aquatic animal nutrition and feed science' is a professional foundation course in higher vocational education of aquiculture specialty.The teaching reformation and exploration were condncted from the positioning of the course,students' interest,theory teaching,practice teaching and assessment examination and other aspects of teaching experience to develop students' learning initiative,stimulate students interest in learning,train students thinking and independent problem solving skills,improve aquatic animal nutrition and feed science teaching effect.%水生动物营养与饲料学是高职高专水产专业的一门专业基础课。从课程定位、学生兴趣、理论教学、实践教学以及考核检查等方面进行了教学改革与探索,从而发挥学生的学习能动性,激发学生的学习兴趣,培养学生思考和独立解决问题的能力,提高水产动物营养与饲料学的教学效果。

  8. Design of Aquaculture Environment Monitoring System Based on ZigBee Technology%基于ZigBee技术的水产养殖环境监测系统设计

    Institute of Scientific and Technical Information of China (English)

    刘玉梅; 张长利; 王树文; 李正仁

    2011-01-01

    传统的水产养殖手段科技储备不足,浪费了人量的人力和物力.本文采用目前无线传感器网络界士流的ZigBee技术,结合GPRS通讯技术,以及网络数据库技术,设计完成了一套完整的水产养殖环境监测系统,对影响鱼类生长的温度,溶解氧含量、PH值等水环境因素进行实时数据采集监测.系统由无线传感器网络节点和网络管理平台两部分组成,设计了良好的人机交换界面.实验表明该系统能实现对水产养殖环境的实时监测,能满足目前水产养殖自动化和统一管理的需求.%The traditional aquiculture means is lack of technology of advantages, wasting a great deal of manpower and material.This paper adopts mainstream ZigBee technology in wireless sensor network field, combined with GPRS communication technology and network database technology, a set of aquaculture environment monitoring system is designed and completed, for the factors such as the growth of fish temperature, oxygen content, PH value of water environment, realtime data acquisition and monitoring are adopted. The system consists of wireless sensor network node and network management platform, designing a good man-computer exchange interface. Through commissioning in the test experiments,the system can realize real-time monitoring to the aquaculture environment, can satisfy the present requirements for aquaculture automation and unified management.

  9. 不同来源嗜水气单胞菌耐药基因检测%Detection of resistance genes in Aeromonas hydrophila strains

    Institute of Scientific and Technical Information of China (English)

    靳晓敏; 葛慕湘; 张艳英; 房海; 陈翠珍

    2015-01-01

    采用PCR方法,对分离于唐山和秦皇岛养殖场的宽体金线蛭( Whitmania pigra)、中国林蛙( Rana temporar-ia chensinensis)、牙鲆( Paralichthys olivaceus)、草鱼( Ctenopharyngodon idellua)、青鱼( Mylopharyngodon piceus)以及鲤(Cyprinus carpio)肝脏的42株不同水产养殖动物的致病性嗜水气单胞菌(Aeromonas hydrophila)进行了4种耐药基因β-内酰胺类(TEM)、氨基糖苷类(ant (3″)-I)、磺胺类(Sul3)和四环素类(tet(A))的检测。结果表明:42株嗜水气单胞菌均100%携带TEM、 ant (3″)-I和Sul3,不携带tet(A)。所检不同水产动物源嗜水气单胞菌均携带TEM、 ant (3″)-I及Sul3耐药基因,从分子层面表明该致病菌多重耐药或潜在耐药严重。%42 pathogenic strains of Aeromonas hydrophila isolated from the liver of Whitmania pigra, Rana chensinensis, Paralichthys olivaceus, Ctenopharyngodon idellua, Mylopharyngodon piceus and Cyprinus carpio cultured in the farms of Tangshan and Qinhuangdao were investigated for the presence of resistance genes -TEM, ant (3″)-Ⅰ, Sul3 and tet(A) using PCR method.The results showed that all detected strains were positive for TEM , ant (3″)-Ⅰand Sul3 gene, and negative for tet ( A) gene.A.hydrophila strains isolated from different aquiculture animals contained multiple resistant genes showed antibiotic resistance or potential resistance of the pathogenic strains was serious .

  10. Using integrated multivariate statistics to assess the hydrochemistry of surface water quality, Lake Taihu basin, China

    Directory of Open Access Journals (Sweden)

    Xiangyu Mu

    2014-09-01

    Full Text Available Natural factors and anthropogenic activities both contribute dissolved chemical loads to  lakes and streams.  Mineral solubility,  geomorphology of the drainage basin, source strengths and climate all contribute to concentrations and their variability. Urbanization and agriculture waste-water particularly lead to aquatic environmental degradation. Major contaminant sources and controls on water quality can be asssessed by analyzing the variability in proportions of major and minor solutes in water coupled to mutivariate statistical methods.   The demand for freshwater needed for increasing crop production puulation and industrialization occurs almost everywhere in in China and these conflicting needs have led to widespread water contamination. Because of heavy nutrient loadings from all of these sources, Lake Taihu (eastern China notably suffers periodic hyper-eutrophication and drinking water deterioration, which has led to shortages of freshwater for the City of Wuxi and other nearby cities. This lake, the third largest freshwater body in China, has historically beeen considered a cultural treasure of China, and has supported long-term fisheries. The is increasing pressure to remediate the present contamination which compromises both aquiculture and the prior economic base centered on tourism.  However, remediation cannot be effectively done without first characterizing the broad nature of the non-point source pollution. To this end, we investigated the hydrochemical setting of Lake Taihu to determine how different land use types influence the variability of surface water chemistry in different water sources to the lake. We found that waters broadly show wide variability ranging from  calcium-magnesium-bicarbonate hydrochemical facies type to mixed sodium-sulfate-chloride type. Principal components analysis produced three principal components that explained 78% of the variance in the water quality and reflect three major types of water

  11. 中国大陆海岸线近30 a的时空变化分析%The analysis of spatial and temporal changes of the continental coastlines of China in recent three decades

    Institute of Scientific and Technical Information of China (English)

    高义; 王辉; 苏奋振; 刘桂梅

    2013-01-01

    基于遥感和地理信息系统的方法与技术,以1980、1990、2000和2010年4个时期为特征年,对近30年来我国大陆海岸线时空变化特征进行了分析研究。结果显示:(1)海岸类型转化显著,人工岸线所占比例由1980年的24.6%上升到2010年的56.1%;(2)海岸线变化呈现显著区域特征,变化较剧烈的区域集中在珠江口岸段、长江口-杭州湾岸段、海州湾-吕四段、滦河口-潍河口段及辽河口-葫芦岛港段;(3)3个时期相比,海岸开发由早期的围垦养殖向后期的城镇建设和海洋运输开发方式转变,并且这种转换方式在南方早于北方。%This paper is mainly focused on the continental coastline changes of China in the span of 1980-2010 . Remote sensing images of Landsat MSS ,TM and ETM+in the year of 1980 ,1990 ,2000 and 2010 are processed to extract coastlines and land use in the gap of coastline changes .Based on the technology of RS and GIS ,the spa-tial and temporal changes of coastline are analyzed ,the result show that :(1) the coastline type changes significant-ly ,the length of artificial coastline in 1980 ,1990 ,2000 ,and 2010 occupies 24% ,39.3% ,49.4% and 56.1% ,re-spectively ;(2) the coastline change shows a significant regional characteristic ,coastline changed significantly in the coast segment of the Zhujiang Estuary ,the Changjiang Estuary to the Hangzhou Bay ,the Lvsi Port to the Haizhou Bay ,the Weihe to the Luan Estuaries and the Liaohe Estuary to the Huludao Port ;(3) comparing the three sub periods of the research span ,a coastal reclamation is mainly focuses on an urban construction and a maritime trans-port in the later period while focuses on aquiculture in the earlier period ;from the north to the south ,the changes of continental coastline of China show significant temporal and spatial heterogeneity .

  12. 臭氧对斜带石斑鱼胚胎发育和初孵仔鱼的毒性效应%The toxic effects of ozone on the embryonic development and post-embryonic larvae of Epinephelus coioide

    Institute of Scientific and Technical Information of China (English)

    郑锦滨; 钟声平; 张钰霆; 郭书林; 陈信忠; 毛勇; 苏永全; 王军

    2014-01-01

    Epinephelus coioide is one of the most important seawater fish that cultured in China. In recent years, with the breakthrough of grouper artificial seedling rearing, the farming scale of grouper has expanded rapidly, and the gross of cultured grouper reached 59 534 tons in 2011. The effective prevention and control of virus, vibrio, and the effective treatment for harmful water quality factors is the key link in grouper artificial seedling rearing. In traditional pond farming mode, strong oxidizers, such as chloride, iodine and potassium permanganate, have played a significant role in disease prevention and water treatment. In recent years, flatfish industrial farming system, as a mature mode, has been driving the technology intergration of grouper recirculating aquiculture system. The solid oxidants mentioned above were greatly limited in the advanced farming mode, while ozone, a kind of gas disinfectant, not only can remove toxic substance such as nitrite, hydrogen sulfide, ammonia nitrogen and killed pathogenic bacteria effectively, but also will not cause secondary pollution, has been widely applied in water treatment of recirculating aquiculture system in the European Union, the United States, Japan and other developed countries. Although the efficiency and stability of ozone disinfection was widely recognized, its security, especially its toxic effects on the cultured livestock, cannot be ignored. In order to evaluate the ozone disinfection and the potential toxicity of ozone to E. coioide, the efficiency of ozone at two kind of concentration (0.05 mg/L and 0.30 mg/L) on water treatment, such as removing vibrio and nitrite, was as-sessed. Furthermore, using the zygote of E. coioide as material, the toxic effects of ozone on the embryonic develop-ment and post-embryonic larvae were discussed. Our results demonstrated that the efficiency of ozone on water treat-ment was favorable, when the concentration of ozone reached 0.30 mg/L, the removal rate of nitrite

  13. Application of Ecological Carbon Fiber Filler in Treatment of Intensive Aquaculture Wastewater%生态碳纤维填料用于集约型水产养殖废水处理

    Institute of Scientific and Technical Information of China (English)

    谌莉莎; 海热提

    2012-01-01

    随着水产养殖逐步从粗放型向集约型养殖发展,水产养殖废水对水环境污染日益加剧.为实现废水循环利用,采用生态碳纤维材料作为接触氧化池内填料处理集约型水产养殖废水,进行中试研究.通过改变曝气强度和水力停留时间(HRT)参数,确定对接触氧化池处理效果及运行特性的影响.试验结果表明:生态碳纤维填料具有易挂膜的优点,接触氧化池内用实际水产养殖废水接种活性污泥,24h后填料表面附有棕褐色的生物膜,池内水体清澈透明.曝气强度和HRT是影响接触氧化池处理效果的重要因素.在DO为3mg几,pH在7~8.5左右,HRT为10h时,COD、NH4+-N、TP、浊度去除率分别为80%、60%、30%和80%左右.NO2 -N、NO3-N浓度分别低于0.1 mg/L和0.5 mg/L,经过接触氧化池处理后的水进入消毒池,出水用于养鱼实现废水循环利用.%As the aquaculture gradually develops from extensive to intensive farming, the effluent water from aquaculture is polluting environment increasingly. To achieve wastewater recycling, pilot study was done by using ecological carbon fiber as contact oxidation filler to treat aquaculture effluent. The treatment effect and operational characteristics on the contact oxidation tank mainly depend on aeration intensity and hydraulic retention time. Results showed that ecological carbon fiber only need 24 h to produce biological membrane on its surface showing clear effluent under the practical aquatic wastewater vaccinating activated sludge. With condition of DO 3 mg/L, pH range 7-8.5 and HRT 10 h, removal rate of COD, NH4+-N, TP and turbidity were 80%, 60%, 30% and 80% respectively. The effluent with concentration of NO2--N and NO3"-N less than 0.1 mg/L and 0.5 mg/L respectively through the treatment of contact oxidation process can be used for aquiculture achieving wastewater recycling.

  14. Rendimento da Atriplex nummularia irrigada com efluentes da criação de tilápia em rejeito da dessalinização de água Behavior of saltbush (Atriplex nummularia irrigated with effluents from tilapia raised in brackish water

    Directory of Open Access Journals (Sweden)

    Everaldo R. Porto

    2006-03-01

    Full Text Available Com o objetivo de avaliar a influência no rendimento da erva-sal (Atriplex nummularia e em algumas características do solo, quando irrigada com efluentes da criação de tilápia (Oreochromis sp. em rejeito da dessalinização de água salobra no semi-árido brasileiro, a erva-sal foi irrigada durante um ano com quatro volumes de efluentes na Embrapa Semi-Árido, em Petrolina, PE, cuja salinidade média foi, de 8,29 dS m-1. O delineamento experimental foi de blocos ao acaso com quatro tratamentos e três repetições. Os tratamentos T1, T2, T3 e T4 correspondem, respectivamente, aos volumes de efluentes aplicados semanalmente, de 75, 150, 225 e 300 L planta-1 . A salinidade média do solo na profundidade 0 - 90 cm foi de 0,40 dS m-1, antes de serem iniciadas as irrigações. Após a colheita, respectivamente para os tratamentos T1, T2, T3 e T4, as salinidades médias dos perfis de solo na mesma profundidade (0 - 90 cm foram de 8,02, 6,09, 4,97 e 4,60 dS m-1 e os rendimentos de matéria seca da erva-sal, de 9,75, 12,26, 14,49 e 13,81 t ha-1. O maior rendimento de matéria seca por litro de efluente aplicado foi para o tratamento T1, com 4,84 g L-1 que apresentou, também, a melhor relação entrada/saída de sal, removendo 13,84% do total de sal incorporado ao solo.Looking forward to reduce environmental impacts resulting from desalinization of brackish water in the region of the crystalline rocks in the semi-arid Brazil, saltbush (Atriplex nummularia was cultivated during one year with four different volumes of aquiculture effluent generated from an intensive tilapia (Oreochromis sp raising system, with a mean salinity of 8.29 dS m-1, in an experimental field of Embrapa Semi-Arid. A completely randomized block design, with four treatments and three replications was used. The treatments T1, T2, T3 and T4 corresponded, respectively, to the weekly volumes of irrigation of 75, 150, 225 and 300 L of water per plant. The mean soil salinity of the

  15. Assessment of coastal wetland ecosystem health based on the press-state-response model: a case study on Liaohe delta%基于PSR模型的滨海湿地生态系统健康评价——以辽河三角洲滨海湿地为例

    Institute of Scientific and Technical Information of China (English)

    林和山; 陈本清; 许德伟; 王建军; 郑成兴; 黄雅琴; 李荣冠

    2012-01-01

    Based on press-state-response model, this paper selected population, economy, environment, resource exploitation, policies and laws, management decision etc. , as indicators for evaluating the health of coastal wetland ecosystem rated on scales of worst, worse, common, good and excellent. Results showed that the health of coastal wetland ecosystem of Liaohe delta was in a common health status. Due to over-cultivation, the natural wetland in Liaohe delta decreased by 11 072 hm from 1988 to 2007. The areas of Suaeda salsa wetland decreased 75% (2 440 hm ) , while aquiculture land increased 182% (9 359 hm ). Water body was seriously polluted by COD (3.06 mg/dm3) , TIN(795.45 u.g/dm3) , phosphate (44. 01 礸/dm3) and Pb(6.46 礸/dm3). According to the analysis of the pollution status and distribution characters, agricultural and industrial pollutions from Liaohe river and adjacent area were important pollutant sources. Owing to environmental problems, wetlands of Phragmites com-munis and Suaeda salsa, species and abundance of birds, and benthic diversity in Liaohe delta degenerated seriously. Finally, actions for ecological protection and management were proposed for the ecosystem of Liaohe delta wetland.%以PSR评价模型为基础,选取人口、经济、环境、资源开发、政策法规和管理决策等指标,诊断和评估滨海湿地生态系统在湿地开发和环境污染等一系列人类活动干扰下的健康现状,将健康等级分为优、良好、一般、较差和极差等5级.结果表明,辽河三角洲滨海湿地生态系统健康状态一般,由于过度的围垦开发,自然湿地面积在1988 ~2007年间减少了11 072 hm2,其中,碱蓬湿地减少了75% (2 440 hm2),而水产养殖场增加了182%(9 359 hm2).流域及沿岸的工农业排污致使评价区域内水体污染较严重,COD、TIN、活性磷酸盐和Pb的含量分别达到3.06 mg/dm3、795.45、44.01和6.46 μg/dm3,普遍为四类或劣四类水质.环境的恶化,导致

  16. Distribution of net-phytoplankton and its influence factors in spring in Xiangshan Bay%象山港春季网采浮游植物的分布特征及其影响因素

    Institute of Scientific and Technical Information of China (English)

    江志兵; 朱旭宇; 高瑜; 廖一波; 寿鹿; 曾江宁; 黄伟

    2013-01-01

    根据2010年春季象山港28个站位的网采样品,共鉴定出浮游植物6门55属158种,其中硅藻135种(占总丰度的99.0%),甲藻18种,其余门类(金藻、蓝藻、绿藻和隐藻)5种.浮游植物平均丰度为35.29×104个/m3,其分布呈较强的斑块状(3.41× 104-142.35×104个/m3),高值区位于横山至白石山水域及乌沙山电厂邻近水域.Shannon-Weiner多样性指数和Pielou均匀度指数总体表现为港口和港口外高于港中部和港底.琼氏圆筛藻(Coscinodiscus jonesianus)为绝对优势种,其丰度(284.97×103个/m3)占总丰度的80.8%.典范对应分析结果显示,影响浮游植物群落的主要因子依次为透明度、悬浮物、温度、水深和氮磷比.光照充足、电厂温排水适度温升、营养盐丰富和氮磷比合适(接近Redfield比值16)导致了港内微藻旺发.受径流、水交换和海洋开发等影响,象山港的理化参数表现了明显的斑块和梯度分布,这为浮游植物的生长提供了不同类型的生境,客观上造成了其分布的空间异质性.聚类、多维尺度和相似性分析结果表明,港底、港中部、港口至港口外区域间的群落组成差异较大.结合历史数据分析表明,象山港浮游植物丰度的升高及群落结构的改变与电厂运行、水产养殖、临港工业发展和滩涂围垦等海洋开发活动有关.%Xiangshan Bay (121°25′-120°00′E,29°05′-29°46′N),located at the East China Sea,is a long semienclosed bay with slow rate of water exchange.As one of the most important marine economic bases in Zhejiang Province,it has confronted a series of ecological challenges due to the coastal power plants (Ninghai and Wushashan Power Plant) running,excessive aquiculture,industrial development,tidal flat reclamation,and sea-crossing bridge construction.These large-scale human activities certainly lead to hydrodynamic alteration,temperature elevation,and eutrophication aggravation in this bay

  17. Ecological sensitivity of Xiamen City to land use changes%厦门市土地利用变化下的生态敏感性

    Institute of Scientific and Technical Information of China (English)

    黄静; 崔胜辉; 李方一; 邱全毅; 马克明

    2011-01-01

    of Geographic Information System (GIS) technology, the spatial distributions of ecological sensitivity were derivate. The results showed that construction land area increased significantly from 67.48 km in 1987 to 308.21 km in 2007, as much as 4. 57 times. The sustained expansion of construction land came from agricultural land and forest. From the year 1987 to 2007, shoreline length of Xiamen City experienced an increase-decrease process, from 290. 19 km in 1987, 343.23 km in 1992, to 299.93 km in 2007. The reclamation aimed at aquiculture causing the coastal line to zigzag and fragment, while the reclamation for transportation or construction land causing the shoreline smoother and shorter. The Land Use Intensity increased from 2.44 in 1987 to 2. 52 in 2007, while the ecosystem services value showed a generally decreasing trend of 7. 39×109 Yuan in 1987 to 7. 02×109Yuan in 2007. The mechanism research of the ecosystem sensitivity to land use change indicated that Land Use Intensity and the ecosystem services value showed an opposite trend and Land Use Intensity increased inversely with the decline of the ecosystem services value. The ESI increased from 1. 50 in 1992 to 4.94 in 1997 , then decreased to 4. 12 in 2002, and finally increased slowly to 4.47 in 2007. Overall, in the past twenty years, the level of ecosystem affected by land use changes was not very severe. Most of the high ecological sensitivity areas located in the coastal area.%当前,城市化与全球变化背景叠加,海岸带生态系统发生了巨大的变化,沿海城市在全球变化下的脆弱性、敏感性与适应能力等问题已经成为政府和科学界关注的重要问题.土地利用变化是导致生态系统敏感性的重要因素之一.以厦门市作为沿海城市的典型代表,对近20 a土地利用变化下的生态敏感性进行系统研究.分析了城市建设用地扩张、围填海等主要土地利用活动对生态敏感性的影响机制;其次建立土地