基于RS与 GIS的太行山山地丘陵区水土流失风险评价--以河北省赞皇县为例

摘要

太行山山地丘陵区由于地形、地貌、气候等自然条件和人类活动的干扰，出现了一定程度的水土流失。本文以河北省赞皇县为例，选取美国陆地卫星2010年Landsat5TM遥感影像、DEM数据和土地利用现状等数据，在RS和GIS的技术支持下，提取对水土流失影响较大的植被覆盖度、地形坡度和土地利用类型等因子，对赞皇县水土流失强度进行等级划分。结果表明：赞皇县水土流失程度有微度、轻度、中度、强度、极强度和剧烈几种情况，其中以微度、轻度和中度为主，分别占土地总面积的69．27％、19．30％和10．86％，主要集中分布于自然保留地、旱地和园地。%Due to natural conditions such as terrain , physiognomy , climate and interference of human activities, there was a certain degree of soil erosion in the Taihang Mountain hilly area .Taking Zanhuang County for example and selecting Landsat 5TM remote-sensing image, DEM and land -use map in 2010 as primary data, the major factors affecting soil erosion , such as vegetation coverage , terrain slope, land-use type and so on ,were extracted based on RS and GIS .And the soil erosion intensity in Zanhuang County was graded.The results showed that the soil erosion in Zanhuang County was divided into the degrees of mired , mild, moderate, strength, pole strength and fierce.Among which, mired, mild and moderate were the prima-ry, which took up 69.27%, 19.30%and 10.86%of total land area respectively , and mainly distributed in nature reserve , dry land and garden plot .