考虑环境成本综合效益的泾河流域最佳管理措施评价与筛选

Assessment and selection of the best management practices for the Jinghe River Basin considering the comprehensive benefits of environmental costs

基于土壤和水评估工具(SWAT)评估9种单一最佳管理措施(BMPs)及其不同组合共计103种BMPs情景布设对非点源污染的消减效率,并基于信息熵的多属性决策方法评估泾河流域BMPs实施成本和非点源控制有效性之间的权衡.研究发现,SWAT模型在泾河流域非点源污染模拟中适用性较好,不同的BMPs对非点源污染负荷削减量存在较大差异,组合BMPs比单一BMPs在降低非点源污染负荷方面表现更好.在农业耕作过程中减少化肥50%的施用量、将坡度大于25°的农田退耕还草以及在河道进行植草水道措施建设是泾河流域具有最大环境成本综合效益值的优选组合BMPs.

The Soil and Water Assessment Tool(SWAT)was used to evaluate the effectiveness of nine individual BMPs,as well as their various combinations-03 different scenarios in total-for reducing non-point source pollution(NPSP).A multi�attribute decision analysis method based on information entropy was also employed to assess the tradeoffs between the cost of implementing watershed BMPs and their effectiveness in controlling NPSP.The results reveals that the SWAT model was well-suited for simulating NPSP in the Jinghe River Basin,and the load reduction of NPSP varied greatly with different BMPs.Combined BMPs performed better than single BMPs in reducing the load of NPSP.The combination of reducing fertilizer application by 50%during agricultural cultivation,returning farmland with a slope greater than 25°to grassland,and planting grass in river channels was the preferred combined BMPs for the Jinghe River Basin with the highest comprehensive benefits value of environment and cost.