三峡库区坡耕地农桑系统对径流拦截和氮磷流失的影响  

Effects of Configuration Mode of Crop-mulberry System in Slope Cropland on Runoff Interception and Loss of Nitrogen and Phosphorus in the Three Gorges Reservoir

作　　者：谢雪东 倪九派[1] 周川[1] 

机构地区：[1]西南大学资源环境学院,重庆400716

出　　处：《水土保持学报》2015年第5期66-69,94,共5页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(413712751);中央高校基本科研业务费项目(XDJK2013016)

摘　　要：采用野外径流小区观测的方法,分析了三峡库区坡耕地5种不同的桑树配置模式(横坡垄作CK、两带等高桑+横坡垄作T1、三带等高桑+横坡垄作T2、四边桑+等高桑+横坡垄作T3、四边桑+横坡垄作T4)拦截径流和氮磷营养元素的效果。结果表明:(1)3次采样获取数据均呈现出T3、T4处理对于坡耕地径流量的控制较对照组CK有显著作用,而T1、T2处理下显示的结果与试验预期效果有所差异;(2)对于坡耕地上氮磷元素控制,T3、T4处理相较于对照CK而言更加高效、更加明显,一定程度上控制了土壤径流流失带走土壤养分中的氮磷元素;(3)不同处理之下土壤径流中养分含量相关分析显示,磷酸、总磷、铵氮之间两两互为共进关系,总氮及铵氮含量与处理之间呈极显著负相关关系,总磷及磷酸盐含量与处理之间呈显著负相关关系。Based on observations in runoff plots,The authors analyzed effects of 5different mulberry planting patterns（CK：Cross ridge;T1：Cross ridge＋mulberry trees on middle-slope and lower-slope;T2：Cross ridge＋mulberry trees on upper-slope,middle-slope and lower-slope;T3：Cross ridge＋mulberry trees on middle-slope and in the four sides of the slope;T4：Cross ridge＋mulberry trees＋mulberry trees in the four sides of the slope）on runoff interception and the control of nitrogen and phosphorus loss in the Three Gorges Reservoir area of China.The results showed that：（1）The sampling results showed that compared to CK treatment,T3 and T4treatments were more useful to control slope cropland runoff yield,but the effects of T1 and T2were different from what we expected.（2）T3and T4 treatments showed better effects on controlling the loss of nitrogen and phosphorus in slope cropland than CK treatment,which controlled the loss of soil nitrogen and phosphorus to some extent.（3）The authors analyzed the relations between different nutrient contents in runoff,and the results showed that positive correlations existed between phosphate,total phosphorus,and ammonia nitrogen content,while the contents of total nitrogen and ammonia nitrogen were negatively correlated,and the contents of total phosphorus and phosphate were also negatively correlated.

关 键 词：种植模式 径流拦截 横坡垄作 土壤氮素 土壤磷素 

分 类 号：S157.2[农业科学—土壤学]