重庆大学学报：自然科学版2011，Vol.34Issue(11)：141-147,7.
三峡库区紫色土坡耕地小流域氮收支估算及污染潜势
Input-output budgets for nitrogen in a typical purple soil sloping ploughland in Three Gorges areas
摘要
Abstract
The Xinzheng watershed in Zhongxian county,Chongqing,is a typical purple soil sloping ploughland in the Three Gorges areas.In 2009,the input-output budgets in this watershed is investigated and the results indicate that the nitrogen input is 918.26 kg/（hm2·a） and the output are 569.46 kg/（hm2·a）.Furthermore,chemical fertilizer nitrogen is the main input source,accounting for 57.63%,and the main output track is nitrogen in crops,accounting for 36.22%.In this small watershed,the nitrogen loss load is 258.77 kg/（hm2·a）.And the primary lost nitrogen is gaseous species,which is approximately 65.11% of the total lost nitrogen.In addition,nutrient nitrogen balance index is 3.4 in this watershed and the nitrogen surplus load is 348.80 kg/（hm2·a）,much higher than the risk value,indicating potential occurrence pollution in ploughland.关键词
紫色土/坡耕地/氮收支/三峡库区Key words
purple soil/sloping ploughland/input-output budgets for nitrogen/Three Gorges areas分类
资源环境引用本文复制引用
郭劲松,刘京,方芳,孙军益,孙志伟,杜立刚..三峡库区紫色土坡耕地小流域氮收支估算及污染潜势[J].重庆大学学报：自然科学版,2011,34(11):141-147,7.基金项目
国家重大水专项资助项目 （）
重庆市重点科技攻关项目 （）
