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《Chinese Journal of Ecology》 2007-11
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Effects of nitrogen addition on soil nitrogen availability in sandy grassland

YU Zhan-yuan,ZENG De-hui,AI Gui-yan,JIANG Feng-qi(Daqinggou Ecological Station,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China)  
By the method of top-closed core insertion,a field experiment of nitrogen addition(20 g·m-2·a-1)was conducted in Daqinggou Ecological Station in 2006 to investigate the seasonal dynamics of soil nitrogen mineralization and available nitrogen in a sandy grassland of southeastern Keerqin sandy land.The results showed that nitrogen addition increased significantly the contents of soil ammonium nitrogen,nitrate nitrogen,and inorganic nitrogen from June 1 to October 15,and the rates of net nitrogen mineralization and nitrification from September 1 to October 15.The seasonal fluctuation of soil available nitrogen was increased,with the ranges of 1.29-11.60 mg·kg-1·30 d-1 in net nitrogen mineralization rate,-4.15-11.20 mg·kg-1·30 d-1 in nitrification rate,and 6.49-20.66 mg·kg-1 in inorganic nitrogen content.The net nitrogen mineralization and nitrification rates increased but ammonium nitrogen content decreased with time,while nitrate nitrogen and inorganic nitrogen contents varied in "V" shape,with the lowest contents observed on July 15,the peak time of biomass production.It was concluded that the soil nitrogen availability in test sandy grassland was lower,and nitrogen addition could significantly increase the capability of its soil nitrogen supply.
【Fund】: 国家重点基础研究发展计划(2007CB106803);; 辽宁省陆地生态过程与区域生态安全重点实验室开放基金项目(06ZDS212SS);; 中国科学院知识创新工程青年人才领域前沿项目(07SBS115S3)资助
【CateGory Index】: S812.2
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