砒砂岩区小流域泥沙来源研究  

Study of Sediment Source of Small Watershed in Pisha Rock Area

作　　者：王晓[1] 

机构地区：[1]黄河水利委员会绥德水土保持科学试验站,陕西绥德718000

出　　处：《中国水土保持》2000年第4期17-18,共2页Soil and Water Conservation in China

基　　金："八五"期间黄河上中游管理局重点课题"晋陕蒙接壤区砒砂岩分布区水土保持综合治理研究"的部分内容

摘　　要：砒砂岩区是我国土壤侵蚀最严重的地区之一。据在小纳林沟试验观测 ,该区农耕地、荒坡地、林草地的年土壤侵蚀模数分别为 64 2 4、5 95 6、12 10t/km2 ,汛期 6～ 9月份侵蚀厚度占全年侵蚀厚度的 68 3 5 % ,流域年土壤侵蚀模数为18670t/km2 ,其中沟谷地年侵蚀产沙量占流域年侵蚀产沙量的 84 89% ,沟间地年侵蚀产沙量占 15 11%。水蚀、重力侵蚀是该区主要的侵蚀方式。Pisha rock area is one of the regions with the most severe soil erosion in China. According to the experimental observation in Xiaonalin gully, annual average soil erosion on farmland, waste slope and grass land are respectively 6 424 t/km 2 , 5 956 t/km 2 and 1 210 t/km 2 with average soil erosion thickness in flood season of June to September accounting for 68 35% of the annual total. The annual soil erosion modulus in the watershed is 18 670 t/km 2 in which sediment yield from gully makes up 84 89% of the watershed total while sediment from lands between gullies are only 15 11% of the watershed total. Water erosion and gravity erosion are the main types in the area.

关 键 词：土壤侵蚀 泥沙来源 沟间地 沟谷地 砒砂岩区 

分 类 号：TV141.3[水利工程—水力学及河流动力学] S157[农业科学—土壤学]