基于电路理论的高原寒地县域生态网络构建

Construction of County Ecological Network in Cold Plateau County Based on Circuit Theory

针对当前高原寒地特殊地理环境及社会经济条件制约下,生态红线斑块连接度低、生态保护压力大等现实问题,以西藏索县为研究对象,通过景观格局指数,提取生态保护红线斑块连通性特征;基于电路理论构建景观电阻面,识别生态廊道并构建生态网络,同时对生态改善区域进行等级划分。结果表明:索县境内共有128个生态保护红线斑块,形成318条生态廊道与39条潜在廊道;红线源地及廊道多分布于县域西部及南部,而东部及北部存在明显断层现象,应增设踏脚石提高分散斑块连通性;基于现状条件与发展愿景,划定了两级生态改善区,并构建了“三片、两带、多廊道、多节点”的生态网络。

In view of the reality of low connectivity of ecological red-line patches and high pressure of ecological protection under the constraints of special geographic environment and socio-economic conditions in the cold plateau,the paper takes Suoxian County,Xizang as the research object to extract the connectivity characteristics of ecological protection red-line patches using landscape pattern index,constructs landscape resistance surface based on circuit theory to identify ecological corridors and construct ecological network and then classify the ecological improvement areas.The results show that there are 128 ecological protection red-line patches in Suoxian County,forming 318 ecological corridors and 39 potential corridors.The red-line sources and corridors are concentrated in the western and southern parts of the county,while obvious disconnections are found in the eastern and northern parts and stepping stones should be added to improve the connectivity of scattered patches.Based on the current conditions and development vision,this paper delineates two-level ecological improvement areas,and constructs the ecological network composed of “three sections,two belts,multiple corridors and multiple nodes”.