基于生态安全格局的县域国土空间生态保护修复关键区域识别——以抚州市宜黄县为例

Identification of key areas for ecological protection and restoration of county territorial space based on ecological security pattern:a case study in Yihuang County of Fuzhou City

为了有效实现国土空间生态保护与修复,探讨国土空间生态安全格局构建与生态保护修复关键区域识别的方法具有重要意义。以抚州市宜黄县为例,基于“生态源地—景观阻力面—生态廊道”的基本框架,以MSPA(形态空间格局分析)模型识别生态源地,将生态保护重要性评价成果作为指标之一构建景观综合阻力面,集成最小累积阻力模型(MCR)、重力模型和电路理论,识别与提取生态廊道,构建国土空间生态安全格局。在此基础上,基于电路理论识别生态夹点、障碍点,进而判断出宜黄县国土空间生态保护修复的关键区域,对需要修复的关键区域进行修复分区并提出修复建议。结果表明:宜黄县有10个生态源地;生态廊道共19条,包括7条重要生态廊道和12条一般生态廊道;待修复生态夹点20处,障碍点26处;待修复关键区域38处,划定为5个生态修复分区,分别为农业用地生态建设区、城镇绿地建设维护区、河道治理修复区、生态用地维护修复区以及道路生态廊道畅通区。

In order to effectively realize the ecological protection and restoration of the territorial space,it is of great significance to explore the methods of constructing the ecological security pattern of the territorial space and identifying the key areas of ecological protection and restoration.Taking Yihuang County of Fuzhou City as an example,based on the basic framework of"ecological source-landscape resistance surface-ecological corridor",the ecological security pattern of territorial space was constructed.The Morphological Spatial Pattern Analysis(MSPA)model was used to identify ecological sources,and the evaluation results of ecological conservation importance were used as one of the indicators to construct the landscape comprehensive resistance surface.The minimum cumulative resistance(MCR)model,gravity model and circuit theory were integrated to identify and extract ecological corridors.Then,based on the circuit theory,the ecological"pinch points"and obstacle points were identified,the key areas of ecological protection and restoration in the territorial space of Yihuang County were judged,the key areas to be repaired were partitioned,and restoration strategies were proposed.The results showed that there were 10 ecological sources and 19 ecological corridors,including 7 important ecological corridors and 12 general ecological corridors in Yihuang County.There were 20 ecological pinch points,26 obstacle points and 38 key areas to be repaired,which were divided into 5 ecological restoration zones,including the ecological construction zone for agricultural land,the construction and maintenance area for urban green space,the river rehabilitation area,the maintenance and restoration area for ecological land,and the unimpeded area of road ecological corridor.