大理河流域土壤侵蚀风险及其空间格局分析

Analysis of soil erosion risk and its spatial pattern in Dali river basin

本文利用遥感影像提取大理河流域相关信息,采用水利部部颁标准评价土壤侵蚀风险等级,并与地形特征进行叠加分析。结果显示:研究区侵蚀风险以中度和轻度为主;坡度是主要影响因素,坡度越大侵蚀风险区越集中,尤其是强度及以上区域,集中程度达到90%以上;侵蚀主要分布在1000m—1400m的两个高程带内。研究结果可以辅助管理部门进行侵蚀治理决策。

This paper extracted the spatial information of Dali river basin from RS imagery, and assessed the soil erosion risk ac- cording to the National Professional Standard for classification and gradation of soil erosion. Subsequently the topographical features of the study area were used in overlay analysis with erosion risk. The results showed that the dominant soil erosion risk is moderate and slight in the basin area; the slope is the main influencing factors, the greater the slope gradient is, the more concentrated the erosion risk areas are, especially in erosion risk areas where greater than more severe erosion, the concentration is more than 90%. Erosion is mainly distributed in the two elevation zones of 1000m-1400m. These results could be used to assist the management for decision-mak- ing department.