成渝地区双城经济圈生态安全格局构建

以成渝双城经济圈为研究对象，基于土地利用数据及生态重要性评价，综合选取生态源地；利用GIS空间分析、最小累积阻力以及夜间灯光优化等方法，构建区域生态综合阻力面；再利用重力模型识别重要生态廊道及生态夹点，最终构建成渝双城经济圈生态安全空间格局.结果表明：成渝双城经济圈生态源地面积占比24.8%，呈半包围圈分布于研究区西南东三面；识别生态廊道193条，总长6441.81km，呈现东密西疏的状态，其中重要廊道占比46.56%，集中在研究区东北方位的达州及巫山巫溪等地；“点-线-面”生态网格构建成渝双城经济区“双核-两轴-半包围”结构的生态安全格局.

Construction of ecological security pattern in Chengdu-Chongqing Twin-City Economic Circle

Took Chengdu-Chongqing Twin-City Economic Circle (CCTCEC) as the research object, and the ecological source areas were firstly identified based on Land-use datasets and the evaluation of ecosystem importance. The GIS spatial analysis technology, minimum cumulative resistance (MCR) model and night lighting optimization method then were applied to establish the regional ecological resistance surface.Finally, gravity model was used to identify key ecological corridors and ecological nodes to construct the ecological security pattern of the study area. The results showed that the ecological sources of CCTEC cover 24.8% of the total territory and mainly located on the east, south and west areas. 193 ecological corridors with the length of 6441.81km were successfully identified, and the density decreases from the east to the west in space. The key corridors account for 46.56% of the total identified corridors, which mainly distributed in the Northeast of study area including Dazhou, Wushan and Wuxi. Comprehensively, the "dual cores-two axes-half surrounded" spatial pattern had appeared.