Land Ecosystem Health Risk Assessment And Prevention Management

The frequent occurrence of natural disasters and unreasonable land use have caused great damage to the health of the land ecosystem and threaten the survival and development of human society.The health risk assessment of land ecosystem can scientifically and effectively evaluate the threat of natural disasters and human activities to land,which is of great significance to the sustainable use of land resources.This paper takes Wu'an as a research area,and builds an evaluation index system based on natural disaster disturbance,human activity disturbance and ecological vulnerability to carry out land ecosystem health risk assessment.According to the evaluation results,the risk prevention and control zone is divided,and corresponding prevention and control is proposed.Countermeasures.The main research contents and conclusions are as follows:(1)Establish the health risk assessment index system of county land ecosystem.This paper sorts out the 16 indicators from three aspects: natural disaster disturbance,human activity disturbance and ecological vulnerability to establish the evaluation index system by combing the relevant literatures on land ecosystem health assessment and risk assessment,combining the regional characteristics and production and living activities of Wu'an.This paper quantifies each index by using hierarchical assignment and formula operation,and uses AHP to determine the index weight.Finally,calculates and generates the regional land ecosystem health comprehensive risk index distribution map.(2)Divide the risk level and reveal the spatial differentiation law of the health risk of land ecosystem in Wu'an.According to the evaluation results,the health risk index is divided into five grades to reveal the spatial differentiation law of the health risks of land ecosystems in Wu'an.Studies have shown that the health of regional land ecosystems is most disturbed by human activities,and the spatial extent shows a trend of decreasing risk from the central to the periphery.Among them,the high-risk areas are mainly distributed in the middle zone of Wu'an City,and there are a small number of distributions in the eastern and western regions.Natural disaster disturbances,human activity disturbances and ecological vulnerability are high in these areas.The relatively high-risk areas are mainly distributed on both sides of the high risk areas,with less natural disaster disturbance and higher human activity disturbance and ecological vulnerability.The medium-risk areas are mainly located in the periphery of higher-risk areas,where natural disaster disturbance and ecological vulnerability are generally low,and human activities disturbance is larger.The relatively low-risk and low-risk areas are mainly distributed in the mountainous and hilly areas in the northwest and southwest of Wu'an,where natural disasters have a greater disturbance,and human disturbance and ecological vulnerability are generally low.(3)Divide the risk prevention and management area and propose corresponding risk prevention measures.This paper uses the spatial analysis function of Arcgis to spatially superimpose the natural disaster disturbance risk level map and the human activity disturbance risk level map.By fully considering the spatial distribution of natural disaster disturbances and combining with the geomorphology of Wu'an,this paper divides Wu'an into five prevention and management areas: natural disaster comprehensive prevention and management area,flood disaster prevention and management area,soil erosion prevention and management area,mining subsidence prevention and management area,and general prevention and management area.According to the partition,propose corresponding prevention and management measures...