长江中游城市群土地生态安全评价及时空格局分析

Research on the Land Ecological Security and Its Spatial-temporal Variation of the Urban Agglomeration in the Middle Reaches of the Yangtze River

土地生态安全是衡量区域经济社会和资源环境可持续发展的重要指标。本文采用DPSIR模型构建了长江中游城市群土地生态安全评价指标体系,运用熵权TOPSIS法对区域内2006-2016年土地生态安全进行定量评价,并运用GIS技术分析其时空分布规律,最后通过空间自相关分析揭示其空间关联性。结果表明:2006-2016年,长江中游城市群土地生态安全逐步提升,由较不安全转变为临界安全,空间上呈现“南高北低”的格局。长江中游城市群土地生态安全内部存在显著的空间正相关且随着时间推移相关性减弱。鄱阳湖城市群东南部区域呈现高值聚集,武汉周边城市呈现低值聚集,武汉与周边城市土地生态安全存在两极化现象。

Land ecological security is an important indicator to measure the sustainable development of regional economy,society and resources.This paper used DPSIR model to construct the land ecological security evaluation system of the urban agglomeration in the middle reaches of the Yangtze River,and used the entropy weight TOPSIS method to estimate the land ecological security in the region from 2006 to 2016.We analyzed its temporal and spatial distribution rules,and finally revealed its spatial correlation through spatial autocorrelation analysis.The results showed that from 2006 to 2016,the ecological security of the urban agglomerations in the middle reaches of the Yangtze River had gradually increased,from less safe to critical security,and the space had a pattern of“south high and low north”.There was a significant spatial positive correlation within the ecological security of the urban agglomerations in the middle reaches of the Yangtze River and the correlation decreased over time.The southeastern part of the Poyang Lake urban agglomeration presented high-value clusters,and the cities around Wuhan showed low-value clusters.The ecological security of Wuhan and surrounding cities was polarized.