基于RS及GIS的南昌市土地生态安全动态评价及分区

Land Ecological Security Dynamic Evaluation and Regionalization in Nanchang City Based on RS and GIS

科学认识土地生态安全时空演变格局规律是区域生态安全及生态文明建设的重要组成部分。利用3S技术,借助PSR模型构建了市域土地生态安全评价指标体系,采用层次分析法及熵值法综合确定了权重,从格网尺度对南昌市土地生态安全进行了动态评价及分区分析。结果表明:(1)时间分异上,15年间南昌市土地生态安全经历了以临界安全等级到以较安全等级为主的变化,2010—2015年,土地生态安全状况改善最好,绿色崛起战略是主要驱动力;(2)空间分异上,2000年北部及中西部低、中南部高;2010年中东部较高、西南和东北较为平稳;2015年南昌市整体较高、中北部及西南部低;(3)分区上,南昌县、进贤县、安义县全部及湾里区、青山湖区等都处于生态持平区,东湖区、西湖区及青云谱区大部分及新建县北部处于生态恢复区,针对不同的分区结果提出了不同的应对措施。研究结论为区域生态文明建设及国土空间综合分区利用提供参考依据。

The scientific understanding of the spatial-temporal evolution pattern of land ecological security is the significant part of regional ecological security and ecological civilization construction.The temporal and spatial evolution pattern of land ecological security in Nanchang City was analyzed scientifically based on land use change.With 3 Stechnology and PSR model were used to conduct the city′s evolution index system of land security,we synthetically used AHP and entropy method to determine the weight of each index.The dynamic evaluation and subarea analysis of land ecological security in Nanchang City were carried out from the perspective of administrative divisions and the grid scale.The results show that：（1）with respect to time differentiation,since 2000 years,the land ecological security in Nanchang City had changed from critical level to mainly relatively safe level over the past 15 years;with the rise of green strategy as the main driving force,the best improvement land ecological security situation had been witnessed during 2010—2015;（2）with respect to spatial differentiation,in 2000,the land ecological security was low in the north and middle west of Nanchang City while it was high in the middle south;in 2010,it was relatively higher in the middle east,and it was relatively stable in the southwest and northeast;and in 2015,the land ecological security of Nanchang was overall higher while it was low in the north center and southwest;（3）Nanchang County,Jinxian County,Anyi County,Wanli District and Qingshanhu District are the ecological balanced areas;and most areas of East Lake,Xihu District,Qingyunpu District and the north of Xinjian County are located in theecologically restored areas.Different countermeasures are put forward according to different partition results.The conclusions can provide a reference for the construction of regional ecological civilization and the comprehensive utilization of land space.