王快水库流域土地利用变化的径流响应

Response of Streamflow to Land Use Changes in Wangkuai Reservoir Watershed

土地利用变化是影响流域径流的重要因素之一。文中以王快水库流域为研究区,基于1980年、2005年、2010年三期土地利用数据,应用ArcGIS10.3软件和SWAT模型,分析不同时期土地利用变化情况及其对径流的影响。结果表明:1)林地和草地是王快水库流域的主要土地利用类型,2005~2010年1889.99 km^(2)的草地转换为林地;2)SWAT模型在该流域具有较好的适用性,该流域径流量总体呈减少趋势,2005~2010年多年平均径流量减少了0.51亿m^(3);3)林地面积与径流变化呈显著负相关(p<0.01),草地面积与径流变化呈显著正相关(p<0.01)。研究成果可为王快水库流域水资源合理规划、土地资源合理配置提供科学的理论依据。

The land use changes was one of the important factors to streamflow.Taking Wangkuai Reservoir watershed as the study area,based on the land use data in 1980,2005 and 2010,ArcGIS 10.3 software and SWAT model was used to analyze the change characteristics and relationships of land use and steamflow.The results showed that:1)Forest land and grassland are the main land use types in the Wangkuai Reservoir watershed.During 2005 to 2010,1889.99 km^(2) of grassland was converted to forest land.2)The SWAT model had good applicability in this watershed.The average annual streamflow showed decreased trend,Which decreased by 0.51×10^(8) m^(3) from 2005 to 2010.3)The area of forest land and streamflow changes were significantly negatively correlated(p<0.01),and grassland area was significantly positively correlated with streamflow changes(p<0.01).This research could supply scientific support for the water resource and land use scheme in Wangkuai Reservoir watershed.