不同高程带上的土壤侵蚀特征分析

Analysis of Soil Erosion Under Different Elevation Condition

利用遥感和地理信息系统技术对中国不同高程带上的土壤侵蚀情况进行了分析 ,结果表明轻度以上水蚀的百分比和水蚀综合指数的最高值都出现在第 6级高程带上 ,即在 10 0 0～ 35 0 0m的高程带上 ,分别为 49.2 %和 180。风蚀综合指数和土壤侵蚀综合指数最高值分别为 5 99和 367,均在第 6级高程带上。冻融侵蚀综合指数最高值为 2 18,出现在第 8级高程带上。在各个高程带上均有水蚀分布 ,在 1,8级 ,极强和剧烈的水蚀分布比例几乎为 0 ,而在 6级高程带上 ,却均在 69.9%以上。高程等级从 1级到 5级 ,均以水蚀为主。在 6级 ,以水蚀和风蚀为主 ,分别占 5 1.1%和 45 .2 %。在 7和 8级 。

Soil erosion under different elevation was analyzed by using remote sensing and geographical information system technologies. It is shown that the maximum of percentage of water erosion above light and water soil erosion index are 49.2% and 180 respectively, it takes place in the region with the altitude between 1 000 and 3 500 meters. The maximum of the wind erosion index and soil erosion integrative index are 599 and 367 respectively, takes place in the region with the altitude between 1 000 and 3 500 meters. The maximum of frozen soil erosion index, 218, in the region with altitude above 5 000 meters. The water erosion dominates in the region with altitude under 1 000 meters. The Water erosion and wind soil erosion dominate in the region with altitude between 1 000 and 3 500 meter. The frozen soil erosion dominates in the region with altitude above 3 500 meters.