基于现代田园城市的成都市景观格局优化

Optimization of Chengdu Landscape Patterns Based on the Modern Garden City

区域景观格局优化对提升生态系统的功能及价值、限制城市格局无序蔓延具有重要意义。以成都市为研究区,应用RS与GIS技术,运用景观指数和生态服务功能评价方法深入分析研究区景观格局时空变化特征和区域生态功能空间差异,并在此基础上辨识生态源地的空间分布,以"田园城市"理念为指导,应用累积耗费距离模型,构建区域生态廊道和生态节点,探索现代田园城市景观格局优化的途径。结果表明:在城市化建设中,有大量的耕地被转化成了建设用地;区域生态功能强度空间差异性显著;生态源地主要分布在龙门山、邛崃山、长丘山和龙泉山一带;根据研究区实际情况构建了"四环六射"的道路生态廊道、河流廊道以及圈层农业廊道;形成了交汇点、湿地和森林公园为主的生态节点。该研究方法及结果对成都市建设世界现代田园城市及解决中国大都市发展中的"大城市病"问题具有重要的参考依据。

Regional landscape pattem optimization is meaningful to the promotion of the region ecosystem function and value, and the restriction of urban pattern＇ s spread. Taking Chengdu as study area, systems analysis was made on the spatial difference of the ecological function and the spatial-temporal characteristics of landscape pattern, and some key ecological function zones were identified,based on the landscape indices and ecosystem services function evaluation by using remote sensing and GIS technology. According to the long-term goal of modem garden city, an accumulative cost distance model was applied and the distribution of traffic trunk and main rivers were considered, there are construction of corridors and eco- nodes in Chengdu. Results showed that in the urbanization process, a large number of farmland has been transformed into the construction land. Ecological functions are much different in spatial distribution, and sources are mainly distributed in Longmen Mountain, Qionglai Mountain, Changqiu Mountain and Longquan Mountain area. In conformity with the actual situation in the study area, ecological corridor, fiver corridor and circle agricultural corridor with four rings and six radiation roads appeared and as a result, the ecological node is formed by intersection, wetland and forest park. The research methods and results would be of important significance to the construction of the world modem garden city and the settlement of ＂ urban diseases＂ of the big cities development.