深圳市生态用地景观连通性动态评价

Dynamic evaluation on landscape connectivity of ecological land:A case study of Shenzhen,Guangdong Province of South China

生态用地是快速城市化地区敏感的土地利用类型,景观连通性是研究景观结构和景观功能互馈关系的重要途径.利用1996—2008年深圳市土地利用数据和基于图论的整体连通性指数、可能连通性指数和斑块重要值,对深圳市生态用地的景观连通性进行动态评价,试图从空间上识别出维持整体景观连通性的重要斑块,并结合深圳市基本生态控制线,评价生态控制线内外生态用地景观连通性的变化.结果表明:1996—2008年,深圳市生态用地全局连通性基本呈下降趋势,维持连通性的重要斑块的重要程度及其分布均发生变化;基本生态控制线对维持线内生态用地的景观连通性发挥了一定作用.

Ecological land is the most crucial and sensitive land use type in rapidly urbanizing areas.Landscape connectivity can help us to better understand the interactions between landscape structure and landscape function.By using the land use data of Shenzhen from 1996 to 2008 and the graph theory-based integral index of connectivity（IIC）,probability index of connectivity（PC）,and importance value of patches（dPC）,a dynamic evaluation on the landscape connectivity of ecological land in the City was conducted,and a spatial assessment was made to identify the most important patches for maintaining overall landscape connectivity.In combining with the basic ecological controlling line in Shenzhen,the variations of the landscape connectivity of the ecological land inside and outside the basic ecological controlling line were evaluated.From 1996 to 2008,the overall landscape connectivity of the ecological land in Shenzhen displayed a downward trend,the importance and the spatial distribution of the important patches for maintaining the overall landscape connectivity changed,and the basic ecological controlling line played definite roles in maintaining the landscape connectivity of ecological land inside the line.