【作者】 文鑫； 邓祥征； 赵永宏； 林英志；

【Author】 Wen Xin~1,Deng Xiangzheng~(2,3),Zhao Yonghong~(2,4),Lin Yingzhi~(2,3) (1 Department of Land Science,China University of Geosciences,Beijing 100083,2 Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101, 3 Center for Chinese Agricultural olicy,Chinese Academy of Sciences,Beijing 100101,4 Graduate University of Chinese Academy of Sciences,Beijing 100049,

【机构】 中国地质大学(北京)土地科学技术学院； 中国科学院地理科学与资源研究所； 中国科学院农业政策研究中心； 中国科学院研究生院；

【摘要】 利用氮素平衡模型,以滇池流域为研究区,对2009年滇池流域陆地生态系统氮收支平衡进行了核算,并分析了氮收支情况对滇池流域环境的影响。研究结果表明:滇池流域氮素流动具有耕地系统氮盈余,而草地系统氮亏损的特征。耕地氮的总收入为26290t,总支出为14055t,盈余12864t。草地氮的总收入为114t,总支出为209.03t,亏损94.67t。一方面,耕地氮素大量盈余,通过地表径流流入滇池是造成其水体富营养化的重要原因之一;另一方面,由于草地氮素的亏损,是造成草场严重退化的重要原因。更多还原

【Abstract】 Estimate of the nitrogen(N ) mass balance of a terrestrial ecosystem in Dianchi Lake catchments for 2009 has been made by using the mass balance model,and analysis its influences on the local environment.Results indicate that input of nitrogen in the watershed mainly comes through the farmland system and only a little through the pasture system.In the former the input is much higher than its output,leaving a surplus o f 12864 t,while in the latter the input is lower than the output,resulting in a deficit of 94.671.The massive loss o f nitrogen is a primary factor causing degradation o f the local pastures. In addition,the surface run off in the watershed brings as high as o f nitrogen into the surface water every year,posing a great pressure on the local water environment.更多还原