Title :
Groundwater Nitrate Contamination in an Agroecosystem in Zhangye Oasis, Northwest China
Author :
Yang Rong ; Su Yongzhong
Author_Institution :
Lab. of Watershed Hydrol. & Appl. Ecology, Chinese Acad. of Sci., Lanzhou, China
Abstract :
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 10.66plusmn0.19 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.
Keywords :
agricultural pollution; agricultural products; agriculture; crops; food products; groundwater; irrigation; nitrogen; nitrogen compounds; soil pollution; water pollution; NO3 --N pollution; NO3-N; Northwest China; Zhangye Oasis; agroecosystem; drinking water; drinking wells; groundwater; hand-pumping wells; intercropped maize area; irrigation wells; loam soils; nitrate pollution; sandy soil; seed maize area; vegetable area; Agriculture; Contamination; Feeds; Fertilizers; Irrigation; Pediatrics; Production; Rivers; Soil; Water pollution;
Conference_Titel :
Bioinformatics and Biomedical Engineering , 2009. ICBBE 2009. 3rd International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2901-1
Electronic_ISBN :
978-1-4244-2902-8
DOI :
10.1109/ICBBE.2009.5162894
