Spatio-temporal variation and driving factors of water supply and demand in Shiyang River Basin
To promote the scientific utilization of regional water resources and the sustainable development of the ecological environment,it was imperative to conduct research on the matching relationship between water yield supply and demand in river basins.In this regard,the Shiyang River Basin(SYB)was chosen as the study area.Employing a range of methodologies including remote sensing imagery,site monitoring data,and reanaly-sis product data from 1990,2000,2010,and 2020,we utilize the InVEST model,water demand estimation method,and geographic detector to comprehensively analyze the status and evolution characteristics of the water yield supply and demand in the SYB during the aforementioned period.This research aims to contribute to the ad-vancement of sustainable water resource allocation in the region and was a critical step towards achieving long-term ecological balance and sustainable development in the basin.The results showed that:(1)Over the period spanning from 1990 to 2020,the spatial distribution of water supply within the SYB has been characterized by a high concentration in the southwest and a lower level in the northeast region.The lowest water yield occurred in 1990,measuring approximately 16.56×108 m3,while the highest yield was recorded in 2010,amounting to around 19.37×108 m3.Woodland and grassland exhibit the highest contribution rates in terms of water production.(2)The water demand in 1990 was the highest(20.39×108m3)and the lowest in 2020(17.78×108m3).Cultivat-ed land is the land use type with the highest water demand in the basin.(3)The matching degree of water supply and demand in the southwestern mountainous area of the basin is higher,followed by the Shiyang River main-stream and tributary area,while the matching degree of water supply and demand in the northeastern and eastern regions of the basin is lower.The polarization of supply and demand index in the study area is obvious,and the spatial distribution of water resources supply and demand in the region is extremely uneven.From 1990 to 2020,the matching status of water production services in Shiyang River showed signs of gradual improvement,and the matching degree of supply and demand of water production services in the basin was significantly improved in 2020.(4)The results of the geo-detector show that the largest factor affecting the spatial differentiation of water yield in the basin among the ten factors was the average annual precipitation.Additionally,the combined effect of multiple driving factors and their interactions has a greater explanatory power than that of a single factor alone.Furthermore,there were two types of enhancement observed:the synergistic effect of two-factor combinations and non-linear enhancements.Therefore,it is crucial to prioritize the strengthening of adaptive management poli-cies for watershed climate change and to promote coordinated watershed management.
water yieldsupply and demand relationshipspatio-temporal patternInVEST modelShiyang River Basin
NETL
NSTL
万方数据
