基于GIS的西藏自治区冻融侵蚀敏感性评价  

GIS-Based Sensitivity Evaluation on Freeze-Thaw Erosion in Tibet

作　　者：李辉霞[1,2] 刘淑珍[2] 钟祥浩[2] 张建国[2] 王小丹[2] 

机构地区：[1]佛山科学技术学院旅游与资源环境学系,广东佛山528000 [2]中国科学院,水利部成都山地灾害与环境研究所,四川成都610041

出　　处：《中国水土保持》2005年第7期44-46,共3页Soil and Water Conservation in China

基　　金：佛山科学技术学院博士启动项目"基于3S技术的草地植被退化与土壤退化互动关系研究";国家重大基金项目(50099620)

摘　　要：通过寻找多年冻土下界与等温线的关系,确定了西藏自治区冻融侵蚀的范围,并运用GIS技术对西藏自治区冻融侵蚀的敏感性作了评价:①加权叠加气温年较差、年均降水量和地形起伏度三个单因素图层,得出冻融侵蚀敏感性指数分布图;②根据敏感性指数的分布情况对冻融侵蚀敏感性进行了分级。评价结果表明,西藏大部分地区属冻融侵蚀敏感区,敏感性总体分布表现为南部高海拔冻融侵蚀区高于北部高纬度冻融侵蚀区。Through looking for the relation between the lower bound of frozen earth and isotherm for many years, the paper ascertains the scope of freeze-thaw erosion of Tibet and evaluates the sensitivity by GIS technology: a) it obtains a distribution map of sensitivity indexes of freeze-thaw erosion based on the three single-factor figures of weighted superposition temperature annual amplitude, annual precipitation and topographic relief and; b) it grades the sensitivity of freeze-thaw erosion based on the distribution of sensitivity indexes. The results of evaluation show that the majority region of Tibet appertain to sensitive area of freeze-thaw erosion and the overall distribution of sensitivity shows that it is higher in the southern high elevation freeze-thaw erosion zone than that of in the northern high latitude zone.

关 键 词：GIS 冻融侵蚀 敏感性评价 西藏 

分 类 号：S157.1[农业科学—土壤学]