Land ecological security evaluation of coal resource-based cities in Ordos based on DPSIR-TOPSIS model
As an important energy base in China,the rapid development of coal-based mining economy in Ordos City has brought great pressure to the natural environment.The high-intensity development of coal resources originally in the plateau environment has an impact on ecological security to a certain extent.In the new era of ecological priority and green development,with the deepening of ecological civilization,the overall environment has been better repaired and improved.Based on the DPSIR-TOPSIS model and based on the current situation of land use in Ordos City,this paper constructs the"pressure-state-impact-response"ecological security system health evaluation system in Ordos in the past five years,and uses the information entropy method to determine the different weights of each evaluation index.The TOPSIS model is used to analyze the health impact of the ecosystem,and the grade evaluation is carried out.It is considered that the ecological security of Ordos City has been greatly improved from 2018 to 2022.It has gradually entered the healthy track.However,as a coal resource-based city and in a specific natural environment,there are still risks such as resource development,ecological degradation and land pollution,which need to be carried out scientifically and with high quality around the aspects of environmental carrying capacity,intensity of land development and utilization,coordinated development of industry and agriculture,green sustainability of mining industry,etc.,so as to realize the safety and sustainable health of land ecosystem.
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