基于最小累积阻力模型的平江县生态安全格局构建

Construction of Ecological Security Patterns in Pingjiang County Based on the Model of Minimum Cumulative Coefficient

生态安全格局对于缓解区域社会经济发展和生态环境保护之间的矛盾具有积极意义。以岳阳市平江县为研究对象,基于平江县土地利用、DEM高程等主要数据,首先进行生态源地分析,发现生态敏感性高的林地及水域可以作为生态源地,结合最小累积阻力模型,进一步确定该县的生态廊道、节点,划分不同层级安全水平区,最后构建平江县生态安全格局。结果表明:(1)研究区内识别生态源地共9片,呈现“两极分布,相对独立”的空间特征;(2)提取生态廊道共35条,生态节点22个,从空间尺度上看,生态廊道集中于北部山地;(3)根据计算结果将研究区划分为5个层级的生态安全水平区,由各生态源地向周围扩散。本研究通过对平江县生态安全格局分析,为保护平江县生态安全、合理利用自然资源提供切实可行的依据。

The ecological security pattern has positive significance for alleviating the contradiction between the regional social and economic development and the ecological and environmental protection.With Pingjiang County in Yueyang as the research object,and the land use data and DEM elevation figure as main data sources,the ecological sources were analyzed.It was found that the forest lands and waters with high ecological sensitivity could serve as the ecological sources.Combined with the minimum cumulative resistance model,the ecological corridors and nodes were further identified,and different level security areas were divided.Finally,the ecological security pattern for Pingjiang County was constructed.The following results are concluded.(1)There are 9 identified ecological sources in the studied area,showing the spatial characteristics of bipolar distribution and relative independence.(2)A total of 35 ecological corridors and 22 ecological nodes have been extracted,and from the perspective of spatial scale,the ecological corridors are concentrated in the northern mountains.(3)According to the calculation results,the studied area is divided into five level ecological security districts,which spread from each ecological source area to the surrounding area.Based on the analysis of the ecological security pattern of Pingjiang County,this work can provide practical and feasible methods for protecting the ecological security of Pingjiang County and rationally utilizing the natural resources.