Groundwater Contamination with NO_3-N in a Wheat-Corn Cropping System in the North China Plain

作     者：ZHAO Bing-Zi ZHANG Jia-Bao M. FLURY ZHU An-Ning JIANG Qi-Ao BI Jin-Wei ZHAO Bing-Zi~1 ZHANG Jia-Bao~(1,*2) M.FLURY~2 ZHU An-Ning~1 JIANG Qi-Ao~1 BI Jin-Wei~1 1 State Experimental Station for Agro-Ecology,State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008(China) 2 Department of Crop and Soil Sciences,Center for Multiphase Environmental Research,Washington State University,Pullman,WA 99164(USA)

作者机构：State Experimental Station for Agra-Ecology State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 （China） Department of Crop and Soil Sciences Center for Multiphase Environmental Research Washington State University Pullman WA 99164 （USA） 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2007年第17卷第6期

页      面：721-731页

核心收录：

学科分类：08[工学] 0818[工学-地质资源与地质工程] 0903[农学-农业资源与环境] 0815[工学-水利工程] 0901[农学-作物学] 

基　　金：Project supported by the Knowledge Innovation Program of the Chinese Academy of Sciences(No.kzc x2-yw-406) the National Basic Research Program of China(No.2005CB121103) 

主　　题：中国 北方平原 小麦 玉米 地下水 污染 

摘      要：The North China Plain,where summer corn(Zea mays L.)and winter wheat(Triticum aestivum L.)are the major crops grown,is a major agricultural area in *** soils make the region susceptible to groundwater pollution by NO_3-N,which is applied to fields in large amounts of more than 400 kg NO_3-N ha^(-1)as fertilizer.A field experiment was established in 2002 to examine the relationship among N fertilization rate,soil NO_3-N,and NO_3-N groundwater *** adjacent fields were fertilized with local farmers N fertilization rate(LN)and double the normal application rate(HN),respectively,and managed under otherwise identical *** fields were under a traditional summer corn/winter wheat *** a 22-month period,we monitored NO_3-N concentrations in both bulk soil and soil pore water in 20-40 cm increments up to 180 cm *** also monitored NO_3-N concentrations in groundwater and the depth of the groundwater *** significant differences in soil NO_3-N were observed between the LN and HN *** identified NO_3-N plumes moving downward through the soil *** HN treatment resulted in significantly higher groundwater NO_3-N,relative to the LN treatment,with groundwater NO_3-N consistently exceeding the maximum safe level of 10 mg L^(-1),but groundwater NO_3-N above the maximum safe level was also observed in the LN treatment after heavy *** rain in June,July,and August 2003 caused increased NO_3-N leaching through the soil and elevated NO_3-N concentrations in the *** rise of the groundwater table into NO_3-N- rich soil layers also contributed to the increased NO_3-N concentrations in the *** results indicate that under conditions of average rainfall,soil NO_3-N was accumulated in the soil *** subsequent significantly higher- than-average rainfalls continuously flushed the soil NO_3-N into deeper layers and raised the groundwater table,which caused continuous groundwater contami