三峡小流域水体硝态氮含量变化特征及其影响因素研究  

Variations and Influencing Factors of Nitrate Nitrogen Concentration in Water in a Small Watershed of Three Gorges Area

作　　者：冯明磊[1] 胡荣桂[1] 许克翠 肖宏宇[1] 阮雷雷[1] 林杉[1] 

机构地区：[1]华中农业大学资源与环境学院,武汉430070 [2]湖北省秭归县水土保持局,秭归443600

出　　处：《环境科学》2008年第1期13-18,共6页Environmental Science

基　　金：国家自然科学基金项目(40471131)

摘　　要：为了解三峡地区典型农业流域水体水质状况以及对流域各影响因素的响应，在2004年和2005年间，对三峡库区内长江一级支流曲溪的水体硝态氮含量进行了连续监测，利用划分子流域的方法，分析了该流域异质景观条件下溪流水硝态氮含量的变化特征.结果表明，该流域溪流水体中硝态氮含量变化在0.4-14.6 mg·L^-1之间，且其含量冬季〉秋季〉夏季〉春季，年际之间也存在着一定的差异，随着农业活动对环境影响的日益加剧水体中硝态氮含量还有加大的趋势；在该流域内水体硝态氮含量与不同类型的土地利用之间存在不同程度的相关性；而且流域内地质水文特征等环境因素对水体硝态氮含量有一定的影响，说明在流域尺度上水体硝态氮含量对影响因素的响应是明显的.In order to study the water quality and response to influencing factors in typical watersheds of Three Gorges area between 2004 and 2005, the variation characteristics of nitrate nitrogen concentration were analyzed under heterogeneous landscape condition through continuous observation with method of dividing into sub-watersheds in Quxi watershed （ the flint-grade branch, located in Three Gorges）. The results suggested that nitrate nitrogen concentration fluctuated between 0.4 and 14.6 mg·L^-1 with the highest in winter,higher in autumn and summer and lower in spring. Discrepancy also exists in different years. In addition, nitrate nitrogen concentration shows increasing trends with the aggravating impacts of agricultural activities on environment. Moreover, nitrate nitrogen concentration had some relationships with different land use types and space layout to some extent, and was also affected by geological and hydrological characters in the sub-watersheds, which indicated that response of nitrate nitrogen concentration in water was evident to influencing factors.

关 键 词：三峡地区 子流域 硝态氮含量 

分 类 号：X522[环境科学与工程—环境工程]