Groundwater nitrate contamination in an agroecosystem in Zhangye Oasis, Northwest China
A study assessed the risk of nitrate (NO3 --N) pollution in groundwater was conducted in Zhangye Oasis, Northwest China. The mean value of NO3 --N concentrations of groundwater samples was 10.66±0.19 mg/L, NO3 --N concentrations exceeding 10 mg/L (the threshold of drinking water set by World Health Organization) was found in 32.4％ of 71 wells, and were 13％, 33.3％, 52.4％, and 50.0％ in the groundwater from drinking wells, irrigation wells, hand-pumping wells and groundwater table observation wells, respectively. The result showed that the samples which NO3 --N concentrations above the dinking water standards nearly were collected from the depth of lower than 20 meter. Groundwater NO3 --N concentrations under vegetable area, seed maize area and intercropped maize area were significantly higher than that under urban area or paddy area. Groundwater NO3 --N pollution in sandy soil area was more severely than that in loam soils area.
groundwater NO3--N soil type of land use
Yang Rong Su Yongzhong
Linze Inland River Basin Comprehensive Research Station,Laboratory of Watershed Hydrology and Applied Ecology,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou,China
国际会议
北京
英文
1-4
2009-06-11（万方平台首次上网日期，不代表论文的发表时间）