自然降雨条件下紫色土坡地氮素随径流迁移特征  

Characteristics of nitrogen transfer with runoff on sloping cropland of purple soil under natural rainfall

作　　者：陈正维 朱波[2,3] 刘兴年[1] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室水利水电学院,四川成都610065 [2]中国科学院山地表生过程与生态调控重点实验室,四川成都610041 [3]中国科学院成都山地灾害与环境研究所,四川成都610041

出　　处：《人民长江》2014年第13期82-85,共4页Yangtze River

基　　金：国家重点基础研究发展计划“973”项目(2012CB417101)

摘　　要：为研究自然降雨条件下紫色土坡地氮素随径流流失的特征,采用野外径流观测法,对一紫色土丘陵区2013年4次典型降雨产流事件进行了监测,测定了径流量及径流中氮素的形态、浓度与通量的变化情况。结果表明:自然降雨条件下,地表径流和壤中流径流量均与降雨量呈显著的正相关性;径流方式对紫色土坡耕地氮素形态在径流中的分配影响显著;地表径流中的氮素以颗粒态氮的形式流失,而壤中流中的氮素以可溶态氮的形式流失;氮素随壤中流淋失是紫色土坡地氮素流失的主要方式。研究结果可为调控长江上游紫色土丘陵区氮素流失提供参考。To analyze the characteristics of nitrogen loss in the slope cropland of purple soil, the runoffs in four rainfall proces-ses in a hilly area of purple soil in Sichuan Basin were monitored, also the variation of form, concentration and flux of nitrogen in the runoff process were measured. The results indicate that under natural rainfall event, the surface flow and interflow are both in a significant positive correlation with rainfall volume;the distribution of nitrogen forms in the runoff is significantly influenced by runoff mode;the main form of nitrogen loss was particulate nitrogen in surface flow and was dissolved nitrogen in interflow. It in-dicated that the interflow was the main transport pathway of nitrogen loss. This research provides a reference for non-point source pollution control in the hilly area of purple soil in upstream of Yangtze River.

关 键 词：紫色土 地表径流 壤中流 坡耕地 颗粒态氮 可溶性氮 

分 类 号：TV121[水利工程—水文学及水资源]