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《Geography and Geo-Information Science》 2014-05
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Effects of Grain Size on Ecological Patch:A Study Case of Wuxi,the Yangtze River Delta Region

WU Wei;XU Li-ping;ZHANG Min;OU Ming-hao;College of Land Management,Nanjing Agricultural University;  
Effect of grain size of ecological patch is of great importance for the precise analysis of regional pattern and the transmission of information for ecological process.Academic researches on effect of grain size have applied to different types of patch,such as land cover,land use and urban heat island type,patches of ecological type rarely is applied.So the purpose of this paper was to explore changes of critical grain size of ecological patch.The study case of Wuxi in the Yangtze River Delta Region was selected because its characteristics were similar to those of previous study cases,i.e.,a rapid urbanizing region with vulnerable environment,human disturbance from frequent social-economic activities and the area extent of 1 000km2.A combination of mixed methods was used including the model of multi-weight factors,landscape metrics at class and landscape level,and metrics of area change.The results demonstrated that:1)landscape metrics at class and landscape level,and metrics of area change existed obvious effect of grain size.The critical grain size showed by the responding curves of landscape metrics of class and landscape level and metrics of area change were the same,i.e.,60meter;the scale domain of landscape metrics of class and landscape level and metrics of area change were(2,30),(2,10)and(2,10)respectively.Generally grain size from 60 mto 300m was the scale domain to local ecological pattern.In this scale domain,the responding curves of indicators changed smoothly,which indicated that the ecological processes are similar and it is suitable for scaling.
【Fund】: 中国博士后基金项目(20090451220);中国博士后基金特别资助项目(2010003592)
【CateGory Index】: P736.14
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