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中国农学通报

中国农学通报 ›› 2011, Vol. 27 ›› Issue (25): 49-55.

• 林学 园艺 园林 • 上一篇    下一篇

不同尺度下城市绿地景观格局与连通性研究

臧卓 张亚男   

  • 收稿日期:2011-04-02 修回日期:2011-06-16 出版日期:2011-10-05 发布日期:2011-10-05
  • 基金资助:

    森林生态系统内部结构及其变化研究

Study on Landscape Pattern and Connectivity with Different Scale of Urban Green Space

  • Received:2011-04-02 Revised:2011-06-16 Online:2011-10-05 Published:2011-10-05

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摘要：

城市绿地是关系城市可持续发展的重要环境因素，开展城市绿地景观格局特征研究是景观生态学研究的重点和热点。以长沙城市绿地景观作为研究对象，结合地理信息系统及遥感技术探讨景观格局与连通性指数随粒度增加的变化特征。研究结果表明：（1）随着粒度增加，各景观格局指数均具有尺度效应，且具有明显或不明显的尺度转折点；第一尺度域是选择适宜粒度的较好取值范围。本研究中景观指数计算的适宜粒度范围是80~90 m。（2）斑块的相对重要性尺度效应不显著。随着物种运动能力越强，斑块分级的尺度效应减小。连通性指数IIC和PC值也不具有较强的尺度依赖性。（3）长沙市绿地景观的连通性不高，景观中连通性重要值较大的大型斑块数量较少，且分布不均衡，有待今后规划改善。

关键词: 细胞凋亡, 细胞凋亡, eIF4G, PKR, 肿瘤坏死因子

Abstract:

Urban green space as an environmental factor plays an important role in advancing the sustainable development of urban. Study on landscape pattern and connectivity with different scale of urban green space is a focal point and hotspot in landscape ecology. In this paper, the effects of grid size on landscape indices were discussed based on landscape map of Changsha City with the technological support of GIS and RS. The results showed: (1) all the landscape indices had obvious scale effects. All indexes had scale inflexions with the grain increased from 5-150 m. The information of diversity, complexity and geometrical characteristics of landscape can be lost rapidly due to the scale inflexions by swallowing patches and modifying patch edges. The appropriate grain size should be chosen in the first scale domain. Based on the above, the appropriate grain extents were identified to calculate landscape indices for the landscape map of Changsha City, which was from 80 m to 90 m. (2) The relative importance of patches in landscape was not obvious scale-dependent. The scale-dependent on the identification of patches prioritization would be reduced by changing the dispersal distance of the animals. IIC and PC were not strong scale-dependent. (3)Large patches with more important value were less and uneven distributed; which caused the lack of communication between the patches, and made the landscape ecological process interrupted and the landscape stability not high.