关键词: 水土流失, 动态监测, 3S技术, 三峡库区汝溪河, 土壤侵蚀, 转移矩阵

Abstract:

In the aim of providing basic data and decision-making basis for soil and water conservation work,we carried out dynamic monitoring on soil and water loss and ecological environment under the support of RS, GIS and GPS technologies. With Ruxi River in Three Gorges Reservoir region as study area, we obtained the pattern, intensity and distribution of soil erosion through spatial overlay based on information of land-use types, vegetation coverage and slope gradient.According to Classification standard of soil erosion, we analyzed the dynamic changes of soil and water loss in 2014 and 2015, and adopted transfer matrix to analyze the area and types of land-use changes. Results suggest that from 2014 to 2015,although the land-use patterns of Ruxi River have experienced structural adjustment, the distribution of soil and water loss were generally stable. The area of microsoil erosion was slightly increased, the area of mild and intense soil erosion kept balance,the area of moderate soil erosion was slightly reduced, and the extremely or severe conditions have been alleviated.

Key words: water and soil loss, dynamic monitoring, 3S technology, Ruxi River in Three Gorges Reservoir region, soil erosion, transfer matrix