Research On Land Ecological Security Evaluation Of Dongchuan Based On RS And GIS

Land resources are the source power of all human economic activities and the material basis of ecological civilization construction.However,the imbalance between social development and land protection causes the land ecological security problem increasingly visible,which restricts the sustainable development of the region.Dongchuan is an ecologically sensitive in the Southwest of China,and the local governments attach great importance to improvement of the ecological environment in it.In this background,based on remote sensing,DEM,thematic data,meteorological data and statistical data to analyze the status quo of land ecological security in Dongchuan with GIS and PSR model.At the same time,analyze existing problems and advance some improving countermeasures to provide data support and theoretical guidance for promoting ecological civilization construction and sustainable utilization of land resources in Dongchuan depend on regions.The main conclusions of this essay are as follows:(1)19 indexes such as soil profile thickness and soil organic matter content were selected to evaluate the land ecological security in Dongchuan.At the same time,the land ecological security was divided into five levels:bad,danger,sensitive,relatively safe and safe.The results showed that the situation of land ecological security of Dongchuan was mainly bad and danger in 2019.The land ecological security of Tangdan Town and Tongdu Street were bad leve with a total area of 649.67km~2,which was 34.70%of Dongchuan.The danger level included Yinmin Town and Shekuai Township with a total area of 312.40km~2,which was 16.69%of Dongchuan.The Sensitivity level included Awang Town with a total area of 285.81km~2,which was 15.72%of Dongchuan.Wulong Town and Tubuka Town were relatively safe leve with a total area of 323.54km~2,which was 17.28%of Dongchuan.Only Hongtudi Town had the safety leve with a total area of 300.70km~2,which was 16.06%of Dongchuan.(2)Dongchuan can be just divided into five regions:the safe region in the southwest,the relatively safe region in the central and northern,the sensitive region in the southeast,the danger region in the northwest and the bad region in the northeast.In view of the problems of the land was poor in retaining water and fertilizer and low level of cultivated land intensification in the safe region of southwest,some suggestions were put forward to improve soil conditions scientifically and implement cultivated land regulation.In view of the problems of single industrial structure and low vegetation coverage rate in the relatively safe region in the central and northern,some suggestions were put forward to develop diversified management and strengthen ecological restoration.In view of the problems of low land productivity and serious soil erosion in the sensitive region of southeast,some suggestions were put forward to deepen the policy of conversion of farmland to forest and do well in ecological management of Xiaojiang River.In view of the problems of destroyed mining ecological environment and lagging industrial development in the danger region of northwest,some suggestions were put forward to strengthen the supervision of ecological environment management in mining and increase land ecological investment.In view of the problems of insufficient funding for ecological at environmental protection and improper land development and utilization in the bad region of northeast,some suggestions were put forward to build a modern environmental governance system and advocate economical and intensive use of land.