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《Resources Science》 2007-02
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Effects on Changing Grain Size of Landscape Indices in Jinghe Watershed

YANG Li~(1,2),ZHEN Lin~1,XIE Gao-di~1,CHEN Cao-cao~1(1.Institute of Geographical Sciences and Natural Resources Research,CAS,Beijing 100101,China;2.Shandong University of Science and Technology,Qingdao 266510,China)  
Landscape indices are widely used in the study of landscape pattern change to describe its components and spatial distribution.And most of analyses on landscape pattern are based on grid data,which will lead to the grain-effect problem.That is,analysis results based on landscape indices will vary according to grain sizes.Although many researchers has studied the grain-effect of different landscape indices,but the study about how to choose the suitable grain for vector data at different scale is scarce.For this purpose,this paper present further study based on a study of analysis of landscape pattern change carried in Jinghe Watershed,which belongs to Yellow River basin of China.Here the landscape map of Jinghe watershed at 1∶(100 000) scale are converted to grid data of 18 grain sizes from 30m to 200 m and then use Fragstats software to get seven landscape indices used in this paper to analysis Jinghe Watershed's landscape pattern changes with grain size increasing.And results show that all of landscape indices used in this paper have obvious grain-effect with grain size changing.According to the grain-effect relationship,seven indices are divided into four types.The mean shape index and contagion index are included in the first type.Two indices of the first type decrease rapidly with increasing grain size,showing an obvious scaling relation(correlation coefficient are 0.9855 and 0.9718 respectively).Indices of the second type include Simpson diversity index and Shannon evenness index.These indices also decrease with increasing grain size,but they have unconspicuous scale inflexions during decreasing(correlation coefficient are 0.9723 and 0.9633 respectively).The third type indices increase with the changing grain size,and it has obvious scale inflexions.Only the largest patch index belongs to this type in our study(correlation coefficient is 0.8406).Indices of the fourth type include patch density index and area weighted mean fractal dimension.Indices of the fourth type show more complex grain-effect relation with the grain increasing,the shape of grain-effect curve looked like "n".The results also show that based on landscape map at 1∶(100 000) scales,the range of appropriate grain for landscape index of Jinghe Watershed was 30m to 40m.
【Fund】: 国家重点基础研究发展规划项目:“西部典型区域森林植被对农业生态环境的调控机理”(编号:2002CB111506);; 国家自然科学基金项目:“北方小麦-玉米农田生态系统服务功能研究”(编号:30570303)
【CateGory Index】: P901
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