Current Status and Control Effectiveness of Soil and Water Loss in Three Gorges Reservoir Region Evaluated by Remote Sensing Technology
The Three Gorges Reservoir region plays an essential role in the ecological and environmental system of the Yangtze Riv-er basin.Thus,extra attentions should be paid to the regional ecological and environmental issues.Soil erosion is one of the key en-vironmental problems affecting the regional ecological security and restricting the reservoir region from executing its function as an ecological protective screen.During 2020-2022,the Monitoring Center of Soil and Water Conservation,Ministry of Water Resourc-es has implemented the remote sensing monitoring station for soil and water loss assessment in the Three Gorges Region,and orga-nized the regional soil erosion dynamic monitoring project.In the project,tasks including field investigations and numerical simula-tion were coupled with remote sensing technology to derive the factors and modulus of soil erosion in the reservoir region,and to evaluate the effectiveness of soil erosion control practices.The results showed that:(1)Forest land and cultivated land were the dominated areas suffering from soil erosion;(2)The steeper areas in terms of higher slopes were more prone to water erosion;(3)During 2020-2022,soil erosion area in the reservoir region showed a decreasing trend at a rate of around 264 km2/a,while the area of soil and water conservation practices was increasing at a rate of 865 km2/a indicating a fairly good achievement of regional soil erosion control strategies.In the further work,reasonable soil and water conservation practices can be designed in the erosion area especially with large slopes,as to further improve the effectiveness of soil and water erosion prevention in the reservoir region.Re-sults of this study can provide supports for comprehensive control strategies of soil erosion in the reservoir region,and for the eco-system construction in the Yangtze River basin.
soil erosion factorssoil erosion modulussoil and water conservation measureseffectiveness evaluation
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