不同耕作方式对紫色土侵蚀的影响  

Study of Soil Erosion in Areas of Purple Soil Under Various Cultivation Systems

作　　者：王勇强[1] 王玉宽[1] 傅斌[1] 王先拓[1] 王道杰[1] 

机构地区：[1]中国科学院水利部成都山地灾害与环境研究所

出　　处：《水土保持研究》2007年第3期333-335,共3页Research of Soil and Water Conservation

基　　金：国家973项目(2003CB415202);中科院知识创新项目(KZCX3-SW-330)

摘　　要：采用人工模拟降雨试验法对四川盆地丘陵区不同耕作方式紫色土侵蚀的影响实验结果表明:在平面耕作与顺坡垄作两种耕作方式下地表侵蚀率随着降雨历时的变化过程可以用对数相关方程进行描述,20 min是侵蚀率变化的转折点;两种耕作制起初的径流含沙量变化起伏较大,以后随着降雨历时的延长,含沙量总体趋于稳定;顺坡耕作加大了土壤侵蚀,两种方式地表稳定侵蚀率最大可以相差30多倍。With artificial simulation of rainfall tests, under various cultivation systems erosion and sedimentation in hilly areas of purple soil are studied and the following results are obtained： Under contour cultivation and down slope-ridge cultivation sedimentation rate varied with rainfall course and could be described with logarithmic equation, sedimentation rate didn＇t change until 20 rain after runoff began; Under the two cultivation the sediment concentration firstly little variety, with the rainfall going the sediment concentration has a stable trend. Compared the two cultivation, down slope-ridge cultivation aggravate the soil erosion, the stable erosion ratio under down slope-ridge cultivation is at most 36 times than contour cultivation.

关 键 词：紫色土区 人工模拟降雨 径流含沙量 稳定侵蚀率 

分 类 号：S157[农业科学—土壤学]