摘要
城市绿地具有重要的生态功能和社会经济价值,是衡量城市生态可持续发展的重要标准。其中,连通性是维持景观功能的关键因素之一。以重庆市都市区为研究对象,结合TM遥感影像图,通过整体连通性指数(IIC)、可能连通性指数(PC)和景观中斑块对连通性的重要值对该区绿地景观的连通性进行了分析。研究结果表明,都市区绿地景观主要由少数巨型斑块和大量小型斑块组成。绿地景观整体连通性较差,这与绿地景观组成密切相关。对于绿地景观的连通性而言,巨型斑块的重要值最大,但小型斑块的重要性也不容忽视。对绿地景观连通性重要值最大的一些斑块主要分布于都市区的几大山脉上,这些斑块是城市绿地规划和保护的首要考虑的对象。基于研究结果,建议在重庆市都市区进行绿地规划时,优先考虑对重要斑块的保护,同时要考虑在巨型斑块之间构建小斑块,使其形成连通性廊道,提高绿地景观的连通性。
Urban greenland provides important socio-economic value and performs ecological functions, and it also is an important measurement of the sustainable development of cities in ecology. Connectivity is one of major indicator for maintenance of ecological functions in landscape. The connectivity of greenland landscape in metropolitan region of Chongqing City was studied based on the theory and method of landscape ecology, combined with Landsat TM remote sensing image. The integral index of connectivity （ IIC ）, probability of connectivity （ PC ） and the important values of patches in greenland landscape were computed by different distance thresholds, The most important patches were found from the greenland landscape used Geographic Information System （GIS）. The results showed that the greenland landscape is consisted of few large patches and many small patches. The connectivity of greenland landscape in Chongqing City is not so well, which was directly related to the construction of the greenland landscape. The most important patches located in the main mountains in the research region. The values of large patches for Connectivity of greenland landscape are more than others size patches, we suggest that it will make great contribution to establish large patches in planning of greenland landscape. However, protecting small patches should be addressed. The better way, which to increase the greenland value in urban ecological and environment management is to increase the connectivity of patches, both small and large patches when planning greenland landscape in metropolitan region of Chongiqng City.
出处
《生态学报》
CAS
CSCD
北大核心
2008年第5期2237-2244,共8页
Acta Ecologica Sinica
