Abstract:

Land use change affects the surface runoff, and analyzing its change law and driving force is helpful to realize the rational utilization of land resources and water resources. Taking the Suzi River basin in the upper reaches of Dahuofang Reservoir as the research object, this study evaluates the effects of climate factors, human factors and land use change on the water volume of Dahuofang Reservoir by using transfer matrix analysis and correlation analysis methods, and discusses the reasons for the increase of water area of the reservoir mainly from the perspective of land use. The results show that the area of reservoir water increased year by year from 2000 to 2020, and the two main land use changes were the increase of forest area and the decrease of farmland area, both of which had positive effects on the water yield of the basin. At the same time, climate change also had a positive effect on the increase of reservoir water quantity.

Key words: land use, transfer matrix, correlation analysis, water yield, driving force, Dahuofang Reservoir, Suzi River basin