Sample records for 氮 (nitrogen)
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41

植被覆盖度和综合治理对纸坊沟流域土壤氮素流失的影响(英文)

Zhang, Xingchang(张兴昌); Shao, Mingan(邵明安)

[中文摘要]:同小流域土壤侵蚀一样,小流域土壤氮素随洪流流失也受到植被覆盖度的影响,通常经过调整小流域内土地利用结构以达到控制水土流失。该研究以8.27 km2纸坊沟流域和1:400比例流域模型为研究对象,研究植被覆盖度和综合治理对纸坊沟流域土壤氮素流失的影响。结果表明:在模拟降雨下,当流域植被覆盖度分别为60%、40%、20%和0时,流域模型铵态氮流失量分别为87.08、44.31、25.16和13.71 kg/km2,硝态氮为85.50、74.05、63.95和56.23 kg/km2,全氮为0.81、1.18、1.98和7.51 t/km2;在自然降雨下,1998年与199...

DRIVER (Chinese)

54

X-Rays and Nitrogen Mustard: Independent Action in Chinese Hamster Cells

Sakamoto, K.; Elkind, M. M.

We have studied the combined effects of X-irradiation and nitrogen mustard treatment on the colony-forming ability of Chinese hamster cells. In contrast to X-irradiation, nitrogen mustard acting by itself yields an exponential dose-effect relationship. Moreover, whether delivered in immediate sequen...

DRIVER (Chinese)

56

The impact of ancient civilization on the northeastern Chinese landscape: palaeoecological evidence from the Western Liaohe River Basin, Inner Mongolia

Li, Y. Y.; Willis, K. J.; Zhou, L. P.; Cui, H. T.

The Western Liaohe River Basin in northeastern China is one of the cradles of ancient Chinese civilization. Archaeological records from this region indicate that human occupation began about 8000 years ago and that agriculture and pastoralism were important activities from an early stage. Very littl...

DRIVER (Chinese)

73

Review Of Kelvin's Equation And Its Modification In Characterization Of Mesoporous Materials

Zhang, Y; Lam, FL-Y; Yan, Z-F; Hu, X

Physical And Mathematical Models As Well As Calculation Methods Of Nitrogen Bed On Porous Media Have Been Introduced To Evaluate The Structural Parameters Of Mesoporous Materials. Kelvin's Equation Is A Link Between The Relative Adsorbate Pressure, The Mean Pore Radius, And Pore Capillarity On The B...

DRIVER (Chinese)

80

Organic carbon and nitrogen isotopes in surface sediments from the western Arctic Ocean and their implications for sedimentary environments Organic carbon and nitrogen isotopes in surface sediments from the western Arctic Ocean and their implications for sedimentary environments

CHEN; Zhihua; SHI; Xuefa; CAI; Deling; HAN; Yibing; YANG; Zuosheng

We thank the teams Chinese Arctic Research of the First and Second Expeditions in 1999 and 2003 for their excellent field work and Miss Li Hongyan for giving help on isotope analyses. We are very grateful to Professors Zhao Jinping and Shi Jiuxin for providing nice map-plotting software and some ref...

DRIVER (Chinese)

111

Characterization and quantification of ammonia-oxidizing archaea (AOA) and bacteria (AOB) in a nitrogen-removing reactor using T-RFLP and qPCR

Jin, Tao; Zhang, Tong; Yan, Qingmei

Using ammonia monooxygenase α-subunit (amoA) gene and 16S rRNA gene, the community structure and abundance of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in a nitrogen-removing reactor, which was operated for five phases, were characterized and quantified by cloning, termina...

DRIVER (Chinese)

117

Azoto, fosforo, kalio, kalcio ir magnio kiekiai įvairiomis azoto normomis tręštų pekininių kopūstų gūžėse ir augalų liekanose Amounts of nitrogen, phosphorus, potassium, calcium and magnesium in the heads and plant residues of chinese cabbage crop fertilised with different rates of nitrogen

Staugaitis, Gediminas; Viškelis, Pranas

2000-2002 m. Lietuvos sodininkystės ir daržininkystės institute tirti makroelementų – azoto, fosforo, kalio, kalcio ir magnio – kiekiai įvairiomis azoto normomis tręštų pekininių kopūstų gūžėse ir augalų liekanose. Nustatyta, jog pekininių kopūstų sausojoje medžiagoje vidutiniškai yra 3,87% azoto (N...

DRIVER (Chinese)