摘要
应用地理信息系统软件的空间分析功能,从土壤侵蚀空间分布特征和流域平均土壤侵蚀模数的角度对草海流域土壤侵蚀现状进行了分析,并提出了水土保持建议。研究表明:草海流域土壤侵蚀面积占流域总面积30.58%,以轻度侵蚀为主,草海流域平均土壤侵蚀模数为870t/km2.a,属于轻度侵蚀地区,中度以上侵蚀主要分布在西南部、东部、南部。从土壤侵蚀与坡度关系来看,Ⅲ级坡度侵蚀面积百分比最大;Ⅵ级坡度平均侵蚀模数最大,为3 232t/km2﹒a;Ⅱ级坡度上侵蚀总量最大。从土壤侵蚀与土地利用现状的关系来看,梯平地、经果林地、难利用地侵蚀面积最大,荒草地平均土壤侵蚀模数最大,为4 273t/km2﹒a;坡耕地侵蚀总量最大。
Based on the application of at Caohai Watershed from the view of Geographic Information System technology, erosion space distribution features and it is analyzed the soil erosion status average soil erosion modulus, and raised the soil conservation suggestions. The study shows that the soil erosion area in Caohai watershed accounts for 30.58% of the total watershed area, mainly the mild erosion. The average soil erosion modulus is 870t/km2 · a, be- longing to mild erosion areas, while the moderate or severe erosion areas are distributed in the southwest, the east or south of watershed. From the view of the relation between soil erosion and slope grades, the soil erosion area at grade III has the highest percentage, while the largest average erosion modulus is grade VI of 3 232t/km2 · a; the erosion at grade II has the maximum amount. From the view centage of soil erosion largest average erosion the maximum. area of ladder ground, cash modulus is waste grassland of the relation between soil erosion and current land use, the per- fruit trees land and the land difficult to use is the maximum, and the largest average erosion modulus is waste grassland of 4 273t/km2· a , the erosion amount of sloping farmland reaches the maximum.
出处
《亚热带水土保持》
2012年第3期4-9,18,共7页
Subtropical Soil and Water Conservation
基金
十二五国家科技支撑计划课题"高原湿地退化生态系统恢复重建技术研究及示范"子专题:"草海流域受损生态系统治理技术与示范(2011BAC0203-3)"
关键词
草海流域
土壤侵蚀
地理信息系统
Caohai watershed, soil erosion, geographical information system
