Analysis of resource-environment carrying capacity based on coupling-coordination evaluation of water-land resources system

Abstract

Water and land resources are the foundation of the survival and development of human society. Systematic coupling-coordination degrees are important contents of resource and environment carrying capacity analysis, which is of great significance to the scientific and orderly overall layout of ecological, agricultural, and urban spaces. In this study, a resource-environment carrying capacity analysis model is constructed based on PSR (pressure-state-response) model. It includes five steps: status analysis of Water-Land resources, coupling-Coordination evaluation of water-land resources system, extraction of limiting factors of resource-environment, analysis of resource-environment carrying capacity, and optimal allocation of resources. Taking Shahe City, Hebei Province as the study area, based on the calculation of water resources, using the suitability evaluation results of land development such as ecological protection, agricultural production, and urban construction, this study evaluates the coupling-coordination degree of multi-systems, so as to form the analysis of resource-environment carrying capacity and suggestions for optimal allocation. The results show that the coupling-coordination degree of the water-land resources system in the whole city is unbalanced, and the uneven distribution of water resources is the crucial restrictive factor of carrying capacity. The degrees of each region are different, either between the ground water and surface water systems, or among ecological protection, agricultural production, and urban construction systems, which provides an important basis for regional development orientation. Through the optimal allocation of water resources, unconventional water such as the south-to-north water transfer project, Zhuzhuang Reservoir, and reclaimed water should be supplied to urban construction, agricultural production, and ecological protection respectively, so as to promote the coupling-coordination of the water-wand resources system and enhance the carrying capacity of the resource environment.