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以ArcGIS9.2为平台,构建了生态系统减轻水库泥沙淤积服务物质量和价值量评估模型。整合2000年的相关数据将此模型应用于二滩水库,并模拟了10种不同土地利用/覆被情景下集水区生态系统该项服务的能力和在水库使用年限内服务总价值的响应。结果表明:2000年,二滩水库集水区土壤保持量12.1亿.ta-1,高值区分布于雅砻江干流和支流水网附近。泥沙输移比在河道附近和水库周边较高。水库周边是最为主要的保沙区。水库使用年限内,集水区对于减轻二滩水库泥沙淤积服务总价值27.53亿元。集水区内不同结构类型的土地利用/覆被情景对保沙能力所产生的影响各异,模拟保沙量符合林地>草地>裸地>农田规律,农田保沙能力最弱,是二滩水库最为主要的产沙源。
Taking ArcGIS9.2 as a platform, an ecosystem assessment model of reducing the quantity and value of sediment services in reservoirs was constructed. The model was applied to Ertan reservoir by integrating relevant data from 2000 and simulating the response of the catchment ecosystem to the service and the total service value over the service life of the reservoir in 10 different land use / cover scenarios. The results showed that in 2000, the soil retention of the Ertan Reservoir catchment was 1.21 billion tons-1, with the high-value areas located near the mainstream of the Yalong River and the tributary water network. Sediment transport ratio is higher near the river and around the reservoir. Surrounding the reservoir is the most important sand holding area. Within the service life of the reservoir, the water catchment area will have a total value of 2.753 billion yuan to alleviate the sedimentation service of the Ertan Reservoir. Land use / cover scenarios with different types of structures in catchment area have different impacts on sand holding capacity. The simulated sand holding amount is in line with the laws of woodland> grassland> bare land> farmland, Reservoir is the most important source of sediment production.