科研之友
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摘要
The landscape pattern of Daqing City, China has undergone a significant change during the last two decades as a result of rapid urbanization. A quantitative analysis describing the spatial fragmentation caused by urban sprawl from satellite images was presented on three dates: 1979, 1990, and 2000. Five landscape indices with supplementary ecological meanings were chosen to facilitate our examination of current fragmentation status and its fragmentation trend. Specifically, the values of mean patch size (MPS) and edge density (ED) indicate a more regular shape in the human-disturbed landscapes than the natural landscapes, while the contagion index (CONT) and mean nearest-neighbor distance (MNND) show a higher fragmentation degree in the natural landscape than the human-disturbed landscape by revealing the contiguity and clumping trends of patches for each class. The different change trends in these fragmentation metrics also reflect the respective change trend and manner of conversion for each class. A GIS-based landscape index, coupled with remote sensing analysis, proved its unique value and effectiveness in assessing landscape patterns and dynamics.
- 出版日期2006-9
