Abstract:

The research on coupling coordination of regional water and land resources aims to promote regional social and economic development and sustainable utilization of water and land resources. In this research， the Fenhe River Basin is selected as the research area. Based on the multi-source remote sensing data， socio-economic statistical data， and reanalysis product data in 2006， 2013， and 2018， the evaluation index system of water and soil resources coupling coordination is constructed. The coupling coordination degree model， spatial autocorrelation model， and geographic detector are used to measure the coupling coordination degree of water and soil resources in the study area from 2006 to 2018， and identify its dominant influencing factors. The results showed that： （1） In 2006， 2013， and 2018， the coupling coordination degree of water and land resources in the basin was mainly low coordination and moderate coordination， which was between ［0.10， 0.50］. In space， the high-value area is mainly located in the middle and upper reaches of the basin， and the low-value area is concentrated in the middle and lower reaches and has obvious time heterogeneity. The multi-year evolution trend is characterized by an upward opening parabola. （2） The Moran's I values of coupling coordination of water and land resources in the study period were 0.274， 0.266， and 0.195， respectively. The whole basin experienced a high-high-low decline process， the global correlation level decreased， the spatial agglomeration effect decreased， and the regional differences decreased. Local autocorrelation is mainly shown as high-high （H-H） and low-low （L-L）. （3） The dominant factors affecting the spatial differentiation of the coupling coordination degree of water and soil resources in the Fenhe River Basin are annual precipitation， the proportion of domestic water consumption， water production modulus， per capita construction land area， etc. Among them， the interaction between annual average precipitation and water production modulus is the strongest. Based on this， in the future we should strengthen the rational allocation of water and land resources in the basin， optimize the structure of land use， coordinate of water and land resources between the upper and middle reaches of the basin， large， medium， and small towns allocation and usage， and actively promote regional inter-basin water transfer and land resources remediation.

Key words: land and water resources, coupling coordination degree, spatial autocorrelation, geographical detector, Fenhe River Basin