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MENG Chen1; LI Jun-xiang 1,2;ZHU Ying1; WU Tong1;XIAO Zhi-jian3; ZHANG Guo-ke4   

  1. 1Department of Environmental Science, East China Normal University, Shanghai 200062, China;2Shanghai Key Laboratory of Urbanization and Restoration Ecology, Shanghai 200062, China; 3Shenyang Yuanda Aluminium Industry Engineering Co. Ltd, Shenyang 110161, China;4College of Architecture Construction,Shenyang University, Shenyang 110044, China

  • Received:2006-10-20 Revised:1900-01-01 Online:2007-07-10 Published:2007-07-10

Abstract: The effects of changing grain size on landscape metrics play an important role in landscape pattern analysis, being one of the important and key issues in landscape ecology. In this paper, the land-use datasets derived from color-infrared aerial photos acquired in 1989 at 1∶50 000 scale were employed to analyze the effects of changing grain size on the landscape metrics in central urban, urban-rural ecotone, and suburban landscape types of Shanghai. The results showed that the responses of landscape metrics to changing grain size fell into three categories. The first group of metrics decreased monotonically, the second group increased in staircase or single hump, both of them showing a consistent scaling relation with increasing grain size, while the third group showed uncertainties. There were critical points (i. e.inflexions) in the response curve for most landscape metrics, which corresponded to the suitable scale in landscape pattern analysis. For Shanghai urban landscape pattern analysis, the appropriate spatial resolution was 10-20 m. Different urban landscape types also had effects on the metrics responses to changing grain size, and the metrics in urban-rural ecotone had different variation trends with those in central urban and suburban landscape types.

Key words: Soil quality, Assessment indicator, Hilly Loess Plateau