基于改进MCR模型的重庆市江津区生态安全格局构建

三峡库区县域生态源地的识别和生态安全格局的构建对库区范围的生态保护具有重要的意义。以三峡库区范围的县域江津区为例,基于改进的最小累积阻力(MCR)模型和GIS空间分析技术,构建生态源地扩张最小累积阻力面和建设用地扩张最小累积阻力面,识别生态廊道、辐射通道以及生态战略节点等生态过程,构建生态安全格局。结果表明：确定了10个生态源地扩张阻力因子和9个城镇用地扩张阻力因子；江津区低水平生态安全格局面积较大,为994.71km₂,占江津区总面积的30.98%；高水平生态安全格局面积仅占江津区总面积的23.66%；识别出区域重要的生态廊道38条,生态战略节点14个；高中低三级生态安全格可以作为三峡库区县域的生态保护和城镇用地开发重要的参考依据。

Construction of Ecological Security Pattern Based on Improved MCR Model in Jiangjin District of Chongqing

The identification of the ecological source of the county and the construction of ecological security pattern are of great significance to the ecological protection of the Three Gorges reservoir area. Taking the county-level Jiangjin District of the Three Gorges reservoir area as an example, based on the improved minimum cumulative resistance (MCR) model and GIS spatial analysis techniques, the minimum cumulative resistance surface for ecological source expansion and the minimum cumulative resistance surface for construction land expansion are constructed to identify ecological corridors, radiation pathways, ecological strategic nodes and other ecological processes, then build an ecological security pattern. The results showed that 10 expansion resistance factors and 9 urban land expansion resistance factors were determined; the low-level ecological security pattern in Jiangjin District was 994.71 km2, accounting for 30.98% of the total area of Jiangjin District; the high- level ecological security pattern only accounted for 23.66% of the total area of Jiangjin District; 38 ecological corridors and 14 ecological strategic nodes were identified; different level ecological safety grids can be used as a basis for ecological protection and development in the Three Gorges reservoir area.