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《Scientia Geographica Sinica》 2008-01
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Vegetation Pattern Dynamics in Zhangye Oasis Based on Two New Landscape Metrics

LIU Chuan-Sheng1,ZHANG Wan-Chang2,YONG Bin1 (1.International Institute for Earth System Science(ESSI),Nanjing University, Nanjing,Jiangsu 210093;2.Regional Climate-Environment Research for Temperate East Asia,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029)  
By using RS and GIS techniques,PPU(Patch Per Unit) and SqP(Sq)(Square Pixel),the two new landscape metrics proposed by Frohn(1998),were utilized in dynamic analyses on vegetation pattern of Zhangye Oasis and proved to have favorable applicability and sensitivity in temporal landscape pattern analyses.It was demonstrated that the new metrics had similar transformation trends and statistical dependence for temporal landscape pattern analyses by comparison with the traditional landscape metrics(Contagion and Fractal Dimension).It was also found that PPU and SqP(Sq) showed more sensitivity than the traditional ones because of their higher coefficient of variation,thus the new metrics were provided with better predictable ability and sensitivity for landscape fragmentation and patch shape complexity,and had advantages in distinguishing the patch types comparing to Contagion and Fractal Dimension.Computation on new landscape metrics and dynamic analysis of landscape metrics behaviors for these time series images clearly revealed the general evolution trend of the oasis from fragmentation to contagion with the gradual enhancement trend of the spatial heterogeneity and patch shape complexity.
【Fund】: 国家重点基础研究发展规划项目(2006CB400502及2001CB309404);; 中国科学院“百人计划”择优支持项目(8-057493);; 中国科学院大气物理研究所东亚区域气候-环境重点实验室开放基金资助
【CateGory Index】: Q948
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