Evaluation And Analysis Of Arable Land Ecological Security Based On PSR Model In Overlapped Areas Of Mineral And Crop Production

The overlapped area of mineral and crop production is an important area in the national security strategy system,which bears the responsibility for the national food security and mineral resources supply.It is directly related to the national food security,energy security,ecological security and environmental safety.The study and research of the temporal and spatial variation features and it's regulation have an important theoretical and practical significance.Here in the paper,it takes Jiaozuo Zhaogu No.2 Mine as a typical study case which is an area of both mineral production and major grain production.According to the data of multi-temporal remote sensing images,field investigation and socio-economic statistics,based on PSR(Pressure-State-Response)Model,the ecological security evaluation index system and the calculation model for arable land in the overlapped area of mineral and crop production are built.The ecological security status of arable land of the study case from 2009 to 2015 is evaluated and analyzed.The system analyzes the main driving force and reveals the spatial and temporal variation of arable land ecological security under the mining pressure.It provides the scientific basis for realizing the quantity control,quality management and ecological management of arable land in the overlapped area of mineral and crop production.The main results are as follows:(1)The ecological security evaluation index system of the arable land in the overlapped areas of mineral and crop production was established by using the analytic hierarchy process and the improved entropy evaluation method.This system is based on the PSR ‘Pressure-State-Response' Model for the effect of coal mining,the response of the crops and the ecological changing process of the arable land.(2)This paper takes every village-level administrative district as a unit to analyze the influencing factors of ecological security of the arable land in the study area from 2009 to 2015 by GIS technology.The results showed that in the overlapped area of mineral and crop production,the temporal and spatial characteristics of the Pressure,Status and Response three subsystems are closely related to the spatial distribution of subsidence area,and the quality degradation process of the arable land is highly consistent with the time and space of coal mining.(3)During 2009 to 2015,the ecological security changing characteristics of the arable land in Zhaogu No.2 Mine were significant.In the time course,the ecological security of the arable land in the mining area showed the changing trend of ‘Good-Worse-Better';in the spatial pattern,the ecological security was getting worse.Other areas were gradually improved from the mine goaf to the around area.But the artificial improvement activities such as afforestation and water area expansion are also important to promote the ecological security of arable land.(4)The space-time driving force of the ecological security changing of the arable land in the mine lot mainly comes from four aspects: the land subsidence caused by the intense coal mining activities,the special fragile geological environment conditions in the mine lot,the soil pollution caused by human intense farming activities and the farmland pollution caused by the coal derivatives.