成渝城市群景观生态风险演变分析

Chengdu-chongqing Urban Landscape Ecological Risk Evolution Analysis

城市群尺度上的生态风险评价是目前急需研究的问题之一。以成渝城市群为研究区域,基于2000、2010、2020年的GlobeLand30数据集,引入景观生态风险指数,从景观生态学角度,运用地统计学与GIS软件进行空间分析,并结合半变异函数、空间自相关分析法等方法,分析了成渝城市群的景观格局变化并对其进行了生态风险评价。结果表明:(1)成渝城市群土地利用类型中建设用地逐年增多,总体耕地与草地面积减少,存在耕地垦殖现象;(2)成渝城市群的景观类型空间分布变得复杂和破碎;(3)成渝城市群生态风险指数整体呈提高的趋势,高生态风险区、较高生态风险区面积逐渐扩大。研究结果为该地区土地利用配置、生态安全格局构建提供参考。

Ecological risk assessment on urban agglomeration scale is one of the problems urgently needed to be studied.Chengdu-Chongqing urban agglomeration is taken as the research area.Based on the GlobeLand30 data set of 2000,2010 and 2020,landscape ecological risk index is introduced.From the perspective of landscape ecology,geostatistics and GIS software are used to carry out spatial analysis,combined with semi-variational function and spatial autocorrelation analysis method.The change of landscape pattern in Chengdu-Chongqing urban agglomeration was analyzed and its ecological risk was evaluated.The results showed that:(1)construction land increased year by year in chengdu-chongqing urban agglomeration,while the total area of cultivated land and grassland decreased,and cultivated land reclamation existed;(2)The spatial distribution of landscape types in chengdu-Chongqing urban agglomeration becomes complicated and fragmented;(3)The overall ecological risk index of Chengdu-Chongqing urban agglomeration showed an increasing trend,and the area of high ecological risk area and high ecological risk area gradually expanded.The results of this study provide reference for land use allocation and ecological security pattern construction in this region.