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《Environmental Science》 2011-10
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Assessment of Shallow Groundwater Nitrate Concentrations in Typical Terrestrial Ecosystems of Chinese Ecosystem Research Network(CERN) During 2004-2009

XU Zhi-wei1,2,ZHANG Xin-yu1,SUN Xiao-min1,YUAN Guo-fu1,WANG Sheng-zhong2,LIU Wen-hua3(1.Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;2.College of Urban and Environmental Science,Northeast Normal University,Changchun 130024,China;3.Key Laboratory of Water Cycle and Related Land Surface Processes,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China)  
The nitrate-N(NO-3-N) concentrations of 38 shallow groundwater wells from 31 of the typical terrestrial ecosystems on Chinese Ecosystem Research Network(CERN) were assessed using the monitoring data from 2004 to 2009.The results showed that the average values of NO-3-N concentrations were significantly higher in the agricultural(4.85 mg·L-1±0.42 mg·L-1),desert(oasis)(3.72 mg·L-1±0.42 mg·L-1) and urban ecosystems(3.77 mg·L-1±0.51 mg·L-1) than in the grass(1.59 mg·L-1±0.35 mg L-1) and forest ecosystems(0.39 mg·L-1±0.03 mg·L-1).Nitrate was the major form of nitrogen,with between 56% to 88% of nitrogen in the nitrate-N form in the shallow groundwater of desert(oasis),urban and agricultural ecosystems.Nitrate-N concentrations for some agricultural ecosystems(Ansai,Yanting,Yucheng) and desert(oasis) ecosystems(Cele,Linze,Akesu) analysis exceeded the 10 mg·L-1 World Health Organization drinking water standards between 14.3% and 84.6%.Significant seasonality was found in Ansai,Fengqiu,Yanting agricultural ecosystems and the Beijing urban ecosystem using the relatively high frequency monitoring data,with the higher nitrate concentrations usually found during summer and winter months.The monitoring results indicated that the shallow groundwater of agricultural ecosystems was contaminated by agricultural management practices,i.e.fertilization,while the shallow groundwater of forest ecosystems was under natural condition with no contamination from human activities.
【Fund】: 中国科学院知识创新工程重要方向项目(KZCX2-EW-310 KZCX2-YW-433-01);; 国家自然科学基金项目(40701186);; 国家水体污染控制与治理科技重大专项(2009ZX07528-004-03)
【CateGory Index】: X523;X824
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