供需权衡视角下甘肃省水源涵养服务空间格局演化研究OA

The gap between water supply and demand in Gansu Province continues to widen,accompanied by the superposition of supply-demand conflicts and ecological degradation.This study selected Gansu Province as the research area.From the perspective of the supply-demand trade-off of water conservation services,a water conservation supply assessment model and a water demand assessment model were used to quantitatively evaluate changes in the water conservation supply-demand pattern.The results showed that:From 2000 to 2020,the spatial dis-tribution of water conservation volume in Gansu Province exhibited a pattern of high in the south,low in the north,low in the west and high in the east.High water conservation volume was concentrated in the Qilian Mountains and the Qinling Mountains.Meanwhile,water conservation volume showed a fluctuating trend of increase,decrease,and then increase.The maximum water conservation deficit increased from 303.701×104 m3 in 2000 to 648.525×104 m3 in 2020.The deficit areas shifted from a scattered northwest-southeast and southwest-northeast distribution pattern in 2000 to an agglomeration around the Lanzhou metropolitan area.The distribution pattern of cold and hot spots of water conservation supply-demand surplus changed.Hot spots migrated from Gannan to the eastern part of the Qilian Mountains,while the cold spot agglomeration area continued to expand,spreading from the junction of Jiuquan,Jiayuguan,and Zhangye cities along the Hexi Corridor into Zhangye City.