基于景观格局分析的长河镇生态绿地网络优化研究

Optimization on Ecological Green Land Network in Changhe Township Based on the Landscape Pattern Analysis

以长河镇航空影像为基础,结合Arcgis、Fragstats等相关软件,对长河镇绿地景观格局进行分析,定性评价绿地斑块组成及破碎化程度。在此基础上,提出了长河镇4个生态绿地网络预案。通过分析不同网络预案廊道数量、长度和密度指标,以及网络结构α指数、β指数和γ指数,确定适合长河镇生态绿地网络构建最优预案。结果表明,长河镇生态绿地斑块数量为6 329块,总面积1 517.24hm2,各类绿地类型斑块数量及面积差异较大,绿地景观破碎化程度较高。通过比较研究,确定预案四具有较高的廊道连通性、网络闭合度和连接度,以及较低网络结构成本比等,优化了生态绿地网络绿地建设,有利于促进长河镇生态绿地连通性,增强生态绿地系统服务功能。

Based on aerial images of Changhe Township and relative software, this paper analyzed the landscape pattern of the township, and evaluated the composition and fragmentation of green land patch. Four ecological network scenarios were designed. By the analysis of some indices such as the corridor number, length, density, and α,β,γ of network structure, the final optimal scenario of ecological green land network within the township was established. The results showed that the total number and area of ecological green land patch in Changhe township were 6 329, and 1 517.24 hm^2, respectively. Differences in patch number and area among different types of green land patch were significant. High fragmentation degree of green landscape was observed. Comparative analysis demonstrated that the fourth scenario had the characteristics of higher corridors connection, network circuitry, network connectivity and lower network cost ratio. The optimization on ecological green land network would promote the connectivity and enhance the systematical service function of ecological green land in Changhe Township.