基于GIS与USLE的榆中县土壤侵蚀  

Soil erosion of Yuzhong County based on GIS and RS

作　　者：耿豪鹏[1] 潘保田[1] 王超[1] 黄波[1] 

机构地区：[1]兰州大学西部环境教育部重点实验室,兰州730000

出　　处：《兰州大学学报（自然科学版）》2009年第6期8-13,共6页Journal of Lanzhou University(Natural Sciences)

基　　金：国家基金委创新研究群体科学基金项目(40721061);国家重点基础研究发展计划(973计划)项目(2005CB422001);甘肃省科技支撑计划项目(0708NKCA122)

摘　　要：在GIS与RS技术支持下应用USLE模型对位于黄土高原西部的榆中县进行土壤侵蚀强度的定量估算,探讨区域土壤侵蚀的空间变异性以及与坡度梯度和土地利用方式之间的关系.得出榆中县的年均侵蚀总量为813137t,年均侵蚀模数为247t/km^2,并且土壤侵蚀的空间变异性明显,年均侵蚀模数与年均侵蚀总量随坡度梯度的增加都呈指数增加.在分析不同土地利用方式下的土壤侵蚀状况后发现,低覆盖度草地才是区域最主要的侵蚀地带.Quantitative research on the soil erosion intensity in Yuzhong County, western Loess Plateau, was estimated via utilizing USLE model supported by GIS and RS technology. An analysis of spatial variability of regional soil erosion was discussed. Furthermore, the effect of slope gradient and land use patterns on erosion intensity also were mentioned, It is concluded that annual average sediment yield is 813137 t and mean soil erosion rate is 247t/km^2 in Yuzhong whereas spatial variability of soil erosion is abrupt. When the slope gradient increases, mean soil erosion rates as well as total sediment yields increase exponentially. After analyzing soil erosion situations of different land use patterns, the results indicate that the low cover steppe is the place where major erosion occurs in the region.

关 键 词：土壤侵蚀 通用水土流失方程 地理信息系统 遥感 黄土高原 榆中县 

分 类 号：P964[天文地球—自然地理学] S157.1[农业科学—土壤学]