气候和土地利用变化对径流变化影响研究——以伊洛河流域伊河上游地区为例

在实际调查基础上,利用遥感和地理信息系统技术,分析伊洛河流域伊河上游地区气候和土地利用变化对径流变化的影响。结果显示,在研究区域中,林地面积最大,1987-2008年,林地、库塘和建设用地面积持续增加,草地、河流和未利用地面积持续减少,耕地面积则先增加后减少。20世纪80年代以来,土地利用变化在不同阶段都使得年平均径流量减小;80-90年代,气候变化使得年平均径流量减小,而90年代到2000年以后,气候变化使得年平均径流量增加,这与90年代年平均降水量减少,而2000年以后年平均降水量增加密切相关。

The Impacts of Climate and Landuse Changes on The Runoff Effects:Case in The Upper Reaches of The Yihe River,The Yiluo River Basin

This paper investigated the climate and landuse changes in the upper reaches of the Yihe River since the 1980s.Based on the field investigation,remote sensing and GIS technology,the distributed hydrological model,SWAT(the Soil and Water Assessment Tool) model,was constructed for the studied basin.The results showed that: in the study area,woodland was the dominant landuse type.In 1987-2008,the area of woodland,pond and construction land increased,while the area of the grassland,river and unused land decreased.The area of arable land increased at first,then reduced.Since the 1980s,landuse changes led to the annual average runoff decreased at different stages.From the 1980s to the 1990s,climate changes caused the annual average runoff to decrease,while increase after 2000.All these had a close relation with the annual average precipitation,which was low in the 1990s and increased after 2000.