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《Acta Scientiae Circumstantiae》 2011-06
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Temporal and spatial changes of nitrogen mass balance in a terrestrial ecosystem of Jiangxi Province,China

LI Xinyan,LI Hengpeng Nanjing Institute of Geography and Limnology,State Key Laboratory for Lake Science and Environments,Chinese Academy of Sciences,Nanjing 210008  
Estimate of the nitrogen(N) mass balance of a terrestrial ecosystem in Jiangxi province for the period 1995—2005 has been made by using the mass balance model.Spatial distributions of the surplus intensities of N are displayed using a geographical information system.Results indicate that the mean annual N inputs vary between 155.5×107 and 184.2×107 kg·a-1,with a mean value of 168.5×107 kg·a-1.Diffuse sources show that biological N fixation constituted the largest source of total N inputs accounting for about 43.1%,while chemical N fertilizer is the second largest contributor,accounting for about 30.9% of the total N inputs.Atmospheric nitrate N deposition and manure N application(including domestic animal and human) account for 17.0% and 9.1% of total N inputs,respectively with N surplus ranging from 39.6×107 to 59.0×107 kg·a-1,showing a stable trend.The surplus intensities of N are highest in the region around the Poyang Lake owing to high intensity agricultural activities,high population intensity and fertilizer utilization.The continuous surplus of N is likely to lead to N saturation in the aquatic ecosystem thus resulting in eutrophication.The study concludes that anthropogenically enhanced N inputs into the ecosystem are about 2~3 times that from natural sources.
【Fund】: 中国科学院知识创新工程重要方向项目(No.KZCX2-YW-337);; 国家自然科学基金项目(No.40871238);; 研究所学科领域发展支持项目(No.NIGLAS2010XK02)~~
【CateGory Index】: X171
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