长沙城市景观破碎化空间异质性研究

景观破碎化表现为景观由单一、均质、连续趋于复杂、异化离散状态.空间异质性是空间景观格局产生的原因.不同尺度下景观破碎化空间异质性表现为不同的特征.遵循"尺度——格局——过程"的思路,以长沙市2005年、2010年遥感影像为数据源,针对都市区空间异质性对不同粒度和幅度水平的响应得到合适的分析尺度,进而对长沙市景观破碎化的空间格局和空间异质性展开研究,最后剖析了景观破碎化与城市生态系统的耦合过程.研究表明:(1)长沙都市区研究中,60 m粒度是一个本征观测尺度,1200 m幅度是理想特征尺度;(2)都市区景观破碎化空间格局复杂;(3)景观破碎化空间异质性受人为因素干扰影响大,随经济社会发展呈正相关关系.

Study on Spatial Heterogeneity of Urban Landscape Fragmentation in Changsha

The landscape fragmentation is a state that landscape transform single, homogeneous, continuous to complex, al-ienated, discrete one. Spatial heterogeneity is the cause of the spatial landscape pattern. The spatial heterogeneity of landscape fragmentation has scale dependence. In this study, on the basis of the interpreted land use maps from RS imagery, we follow the idea "scale-pattern-process" and analysis the metropolitan area spatial heterogeneity in Changsha. The study mainly include the response of different grain and range and the appropriate scale, the spatial heterogeneity under typical scale, and the coupling mechanism of landscape fragmentation and urban ecosystem. Research shows that:(1)According to the spatial heterogeneity anal-ysis of Changsha metropolitan area, we choose 60 meters as a Intrinsic observation scale, and 1200 meters as a Ideal characteristic scale;(2)The spatial pattern of landscape fragmentation in urban area is complex;(3)The spatial heterogeneity of landscape frag-mentation is seriously influenced by human factor interference, and has a positive correlation with the social development.