Research Of Land Use Change And Ecological Security Evaluation Based On RS-GIS In Ruichang City

Land resources as an important carrier for the sustainable development of society and economy,that is,the basic elements and material environment of benign succession of ecological environment,is also the basis for human survival and development.Land use and land ecological security are related to the harmony,stability and sustainable development of the regional social economy.However,most of the land ecological security problems are caused by the change of land use patterns.The various ecological problems caused by the change of land use mode restrict the sustainable development of regional economy.Based on the relevant concepts of land use change and land ecological security and research of both home and abroad,in the paper select Ruichang city of Jiangxi Province as the research area,the change of land use and the ecological safety of land in Ruichang in the past 2005-2015 years were researched and analyzed.First,collect data on remote sensing images of the 2005,2008,2011 and 2015 research areas,the four phase land use database of Ruichang was obtained through the interpretation and post-processing of images through ENVI5.1 and ArcGIS10.2 software.The change of land use in Ruichang is analyzed from three aspects: the change of the number of land use types,the change of time and space and the change of degree.Then,based on the comprehensive consideration of the local social and economic environment and other factors,the evaluation index system of land ecological security is established based on the PSR model,through the combination of analysis of entropy method and AHP phase weighting method to determine index weight,and use the measurement and classification of land ecological security status of 2005-2015 11 years in Ruichang city model of matter-element analysis,to analyze the changes of land ecological security situation of Ruichang City,the research period and related reasons.The main results of this paper are as follows:(1)Land use changesThrough data analysis,we found that farmland,woodland,garden and unused land decreased to varying degrees in the research period,while construction land and water area increased.The construction land increased most,mainly distributed in the downtown area of the main battlefield of the urbanization construction in the northeast of Ruichang and the urban area of the Matou town and Guilin Street;woodland decreased most,mainly distributed in the northeast of Ruichang City,the Matou town,Baiyang town and Guilin street,Southeast of the hinterland of the Fan town,Hengan town and Gaofen town;the reduction of arable land is mainly distributed in the northeast city of Ruichang City,the rapid expansion of the Matou town,Baiyang town and Guilin street.The four period comprehensive index of land use in 2005,2008,2011 and 2015 in Ruichang were 233.68,233.71,234.37 and 235.51 respectively.The change rate and change rate of land use degree were 1.83 and 0.78 respectively during the research period.The research period of land use in Ruichang city level gradually increased,remained stable in the early stages of development,the comprehensive index of land use degree can see the degree of land use in the range of [100,400] in the lower level,for the future development and utilization of land can be further enhanced.(2)Ecological security evaluation of landIn the research period,the comprehensive value of land ecological security in Ruichang has a certain fluctuation,but the overall trend is steadily rising,The ecological security of land is changed from "less safe" state to "safer" state at the end of the research.Among them,the level of ecological security of land in 2005-2008 is in a "less secure" state,shifting to "critical safety" status in 2009 and continuing to 2012 and 2013 to "safer" status,the level of land ecological security still has further improvement.At the same time,it can be found that the integrated value of ecological security of land in each year of the research period is within the range of(-1,0).According to the meaning corresponding to the measurement range of matter-element model correlation,the land ecological security of Ruichang City from 2005 to 2015 Subordinate level does not fully meet the corresponding state standards,membership status is unstable,vulnerable to external factors and lead to changes.(3)Countermeasures and Suggestions to improve the ecological security of landIn view of the results of land ecological security analysis,based on land use,in order to further enhance the level of land ecological security in Ruichang and achieve the coordinated and sustainable development of regional social and economic development,we put forward 5 countermeasures and suggestions: 1)Optimizing and adjusting the structure of land use to promote the control of the use of natural ecological space;2)Establishment of real time supervision system and maintenance system for land ecological security;3)Reducing agricultural pollution and changing the mode of agricultural development;4)Speed up the adjustment of industrial layout and structure to reduce the energy consumption of GDP;5)Strengthening the awareness of public land ecological protection and carrying out the publicity of land ecological protection.