Spatio-temporal dynamic evaluation of land use benefit and its coupling coordination in Gansu Province

Abstract Based on the model of “economic benefit-social benefit-ecological benefit”, the evaluation index system of land use benefit was constructed, revealing the dynamic changes of the spatial and temporal pattern of land use benefit in Gansu Province. Combining the coupling coordination degree model, it analyzes the coupling coordination degree of economic, social and ecological benefits, and quantitatively analyzes its main limiting factors. The results show that: (1) The comprehensive benefits of land use in Gansu Province from 2000 to 2017 showed an upward trend. The spatial pattern of “high in the north and low in the south” was obvious, and a “dual core” structure with Lanzhou and Jiayuguan as the main cities was formed.(2) From the perspective of sub-systems, economic benefits show a trend of “rising first and then falling”, and the spatial pattern is still “high in the north and low in the south”; the social benefits basically show an upward trend. The northwest is characterized by “first decline and then rise”, and the southeast is characterized by “continuous rise”. The spatial pattern is “high in the middle, followed by the northwest, and lower in the southeast”. The ecological benefits are mainly present the trend of “rising first and then falling” markedly changed the spatial pattern.(3) From the perspective of the coupling coordination relationship, all cities in Gansu Province are in a state of imbalance, mainly with moderate imbalance, and the coupling coordination needs to be improved.