基于最小累积阻力模型的三峡库区重庆段生态安全格局构建

Ecological Security Layout Planning of Chongqing Section in the Three Gorges Reservoir Area Based on the Model of Minimum Cumulative Coefficient

三峡库区是长江上游生态环境集敏感、脆弱、复杂为一体的地区,其生态安全格局的构建对维护区域生态安全、实现区域可持续发展具有重要作用。以三峡库区重庆段为研究区,采用2018年土地利用现状数据和遥感数据,构建生态服务重要性与生态敏感性评价体系,综合确定生态源地;以坡度、起伏度、土地利用类型确定阻力值,采用最小累积阻力模型构建生态廊道,最终形成三峡库区重庆段生态安全格局。研究结果表明:三峡库区重庆段生态源地面积13660.80 km^(2),占研究区总面积的29.61%,主要分布于巫溪、奉节、石柱、开州等区县;生态廊道连接生态源地,共81条,总长度为3069.29 km,廊道呈树状辐射分布,呈现"东北-西南"树状分布的空间格局;生态源地与生态廊道共同形成三峡库区东北生态城镇圈、三峡库区西南都市生态圈以及连接两圈的三峡库区中部走廊的"一廊两圈"生态安全格局。研究结果对保障三峡库区生态安全具有重要意义,可为三峡库区生态环境环境保护提供科学依据。

The Three Gorges Reservoir Area is a region with sensitive,fragile and complicated ecological environment in the upper reaches of the Yangtze River.The construction of its ecological security pattern plays an important role in maintaining regional ecological security and achieving regional sustainable development.In this study,the Chongqing section of the Three Gorges Reservoir area was used as the research area,using 2018 land use status data and remote sensing data to build an evaluation system of the importance of ecological services and ecological sensitivity to comprehensively determine ecological source areas;Determine the resistance value and use the minimum cumulative resistance model to build an ecological corridor to form an ecological security pattern in the Chongqing section of the Three Gorges reservoir area.The research results show that the ecological source area of the Chongqing section of the Three Gorges Reservoir area is 13660.80 km^(2),accounting for 29.61% of the total area of the study area,which is mainly distributed in Wuxi,Fengjie,Shizhu,Kaizhou and other counties;81,with a total length of 3069.29 km,the corridors are distributed in a tree-like radiation,showing the spatial pattern of"Northeast-Southwest"tree-like distribution;The ecological security pattern of"one corridor and two circles"in the northeast of the Three Gorges Reservoir,the southwestern urban ecosphere of the Three Gorges Reservoir,and the central corridor connecting the two gorges is formed by the ecological source and the corridor.The results of the study are of great significance to the protection of the ecological safety of the Three Gorges Reservoir area and can provide a scientific basis for the environmental protection of the Three Gorges Reservoir area.