摘要
根据景观生态学相关理论,不同景观要素组成的空间格局是影响其空间绩效的主要因素之一。在综合分析生态系统服务、景观空间结构、生态敏感性及其累计耗费距离表面水文功能等空间绩效的基础上,分析研究狸桥镇绿地生态网络空间布局。结果表明:研究区生态系统服务价值为37 538万元/a,其空间绩效较优;在其平原地区,建设用地和耕地广布,生态斑块较小且连接度较低,景观呈现破碎化;在中西部山区,生态斑块较大,但对其周边生态服务能力较弱;研究区生态敏感性划分为极度敏感区、高度敏感区、中度敏感区、低度敏感区和非敏感区5个等级,分别占研究区36%、18%、17%、19%和10%;以生态敏感性综合评价值作为费用表面,确定具有一定生态系统服务价值的生态用地作为生态源,进而构建累计耗费距离模型。并通过Arc GIS水文分析,规划了境域潜在生态廊道和生态节点;结合狸桥镇河流、道路及空间特征现状,综合构建了城镇绿地生态网络,为今后城镇生态建设和发展提供科学依据。
According to the theory of landscape ecology, the spatial pattern composed of different landscape elements is one of the main reasons of influencing the spatial performance. Based on the analysis of spatial performance such as the ecosystem service function, landscape spatial structure, ecological sensitivity and the hydrological function of accumulative cost distance surface in Liqiao town, the spatial layout of the town green land ecological networks has been studied. The results showed that the value of the ecosystem service function was 375.38 million RMB/a and its spatial performance was good. In plain area, there were a lot of cultivated and construction lands, and ecological patches were smaller and their connection were low and landscape fragmentation was very high. In the central and western mountainous area, ecological patches were larger, however the capability of their ecological service in surrounding area was weak. The five grades of ecological sensitivity classification were extreme sensitivity, strong sensitivity, moderate sensitivity, slight sensitivity and non-sensitivity, the area percentage of them were 36%、18%、17%、19%, 10%, respectively. Taking the value of ecological sensitivity overall evaluation as cost surface, the ecological sources were decided by the help of ecological land with a certain of ecosystem service function and ecological accumulative cost distance model was created also. Through the analysis of hydrological function in the study area by Arc GIS software, the regional potential ecological corridors and nodes were panned. Combined with the present situation of the rivers, roads etc., this paper synthetically constructed the town green land ecological networks in order to supply scientific base for ecological construction and development in Liqiao town.
引文
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