Emergy evaluation of ecological and economic value of water and soil resources in residential and industrial land based on energy analysis

Scientific identification of the ecological and economic value of water and soil resources and quantitative evaluation are the basis for scientifically guiding the rational allocation of water and soil resources. Various values in previous studies were difficult to measure and compare uniformly, owing to their different manifestations. Based on ecological economics, the energy conversion mechanism of the interaction process of water and soil resources was described, and the ecological and economic values of the water and soil resources generated in the accompanying process were identified in this study. Then, for industrial and mining, residential, and public service land subsystems, the energy analysis method was used to obtain the unified calculation of the ecological and economic value of the water and soil resources. Using Luoyang City, Henan Province, China as the research area, the ecological and economic value of water and soil resources for residential and industrial land from 2015 to 2019 was calculated and according to the results, they were ranked as industrial and mining land > residential land > public service land. This study provides a unified quantitative analysis method for comprehensive decision-making for the rational utilisation of water and soil resources in specific counties, cities, and provinces.