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Nitrogen sink in a small forested watershed of subtropical China

查看全文 作　　者：Laiming [1,2]Huang Jinling [1,2]Yang Ganlin [1,2]Zhang 高影响力作者 机构地区：[1]State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;[2]Graduate School of Chinese Academy of Sciences, Beijing 100049, China高影响力机构 出　　处：《Journal of Environmental Sciences》索引2011年第23卷第3期,共8页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (No. 41071141,40625001);the International Foundation of Science (No. C/4077-2);the fund from Institute of Soil Science,Chinese Academy of Sciences (No. ISSASIP0704) 摘　　要：Global nitrogen (N) emission and deposition have been increased rapidly due to massive mobilization of N which may have longreaching impacts on ecosystems.Many agricultural and forest ecosystems have been identified as secondary N sources.In the present study,the input-output budget of inorganic N in a small forested watershed of subtropical China was investigated.Inorganic N wet deposition and discharge by stream water were monitored from March,2007 to February,2009.The concentrations and fluxes of inorganic N in wet precipitation and stream water and net retention of N were calculated.Global N input by dry deposition and biological fixation and N output by denitrification for forested watersheds elsewhere were reported as references to evaluate whether the studied forested watershed is a source or a sink for N.The results show that the inorganic N output by the stream water is mainly caused by NO 3-N even though the input is dominated by NH 4 +-N.The mean flux of inorganic N input by wet precipitation and output by stream water is 1.672 and 0.537 g N/(m 2 ·yr),respectively,which indicates that most of inorganic N input is retained in the forested watershed.Net retention of inorganic N reaches 1.135 g N/(m 2 ·yr) considering wet precipitation as the main input and stream water as the main output.If N input by dry deposition and biological fixation and output by denitrification are taken into account,this subtropical forested watershed currently acts as a considerable sink for N,with a net sink ranging from 1.309 to 1.913 g N/(m 2 ·yr) which may enhance carbon sequestration of the terrestrial ecosystem. 关 键 词：森林流域 小氮肥 亚热带 水槽 中国 森林生态系统 输入输出 大气降水
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