Measuring long-term ecological changes in densely populated landscapes using current and historical high resolution imagery

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	Measuring long-term ecological changes in densely populated landscapes using current and historical high resolution imagery
	Wang Hongqing
	2006
关键词	Environmental engineering Imaging systems Mapping Regional planning Urban planning Vegetation
英文摘要	Long-term ecological changes within densely populated landscapes account for a growing share of global environmental change. Measuring the causes and consequences of these changes remains a challenge because of their fine spatial scale and complexity. Here, we measure long-term ecological changes, circa 1950 to 2002, within six 1 km² sites in densely populated rural China and in urban and suburban Baltimore, Maryland, USA using a standardized procedure for fine-scale feature-based ecological mapping from high spatial resolution (&le 1 m) imagery. The median size of ecologically distinct landscape features (ecotopes) mapped by this procedure was just 520 m², though size, count and perimeter of features varied considerably both within and between sites. Land management and vegetation cover changed substantially, over 28% to 87% of site areas, but most of this change occurred in small patches with area < 4000 m². Landscape complexity also increased over time by the fragmentation of landscapes into a larger number of smaller features with an increasing diversity of ecotope classes. Detailed analysis of fine-scale landscape transformations helped identify the causes and consequences of ecologically significant changes within and across sites, including unexpected increases in perennial vegetation cover and the linkage of impervious surface area with population density. These and other results demonstrate the general utility of anthropogenic ecotope mapping as a tool for cross-site comparison and sampled regional estimates of long-term ecological changes within densely populated landscapes. © 2005 Elsevier Inc. All rights reserved.
出处	Remote Sensing of Environment
卷	100 期:4 页:457-473
收录类别	EI
语种	英语
内容类型	EI期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/24954]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Wang Hongqing. Measuring long-term ecological changes in densely populated landscapes using current and historical high resolution imagery. 2006.