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《Acta Ecologica Sinica》 2006-07
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Effects of spatial grain size on landscape pattern of land-cover types in the rapidly urbanized region

GONG Jian-Zhou,XIA Bei-Cheng~*,LI Nan,GUO Luo (School of Environmental Science and Engineering,Sun Yat-Sen University,Guangzhou 510275,China).  
The concept of scale is of great importance and also a scientific frontier in ecology,landscape ecology,and geography.The study of scale changing involves how theories and methods under a different scale.Scale changing,therefore,affects many fields and remains to be thoroughly studied.Being basic spatial unit,different grain sizes affect the results of spatial analysis.Scale response of landscape characteristics of spatial features becomes one of the most important issues in geographical and ecological researches.The SPOT image of remote sensing of central Guangzhou on November 7,2002 was translated as the basic vectorgraph of land cover types.The basic cell size(the original pixel) of the translated vectorgraph was 5m.A series of vectorpraphs with different grid cells were constructed by assembling the basic cells using the software Grid module of Arc/info.In these vectorgraphs,different grid cells consisted of different basic cells,which the scale was represented by the pixels in one side of the square grid cell,including 1,2,3,4,5,6,7,8,9,10,16,24,32,64,128,256 and 512 pixels/basic cells.The scale effect of spatial grain sizes was analyzed under two levels of land-cover types and landscape in the study area.Results showed that dominant types of landscape were strengthened with increasing grain size.Areas of greenland and urban land,the highest two in eight types of land covers,increased with the increasing grain sizes.The increasing area ratio of urban land was largest,from 32.88% to 37.32% with the grain sizes changing from 4×4 to 16×16 pixels.Area ratios of farmland,woodland,scrubland and road square decreased with the increasing grain sizes.Among four types,the area ratio of farmland decreased most rapidly from 11.75% to 7.54% with grain sizes changing from 4×4 to 16×16 pixels.The area ratios of orchard and water did not change significantly with different grain sizes.There were obvious scale effects to respond to different grain sizes in land cover types and landscape.The responding extents were varied with different land cover types and landscape.In the same type,the responding extents within different grain sizes were different.Among landscape indices,the patch density(PD),MESH,and DIVISION of land cover were most sensitive in responding to different grain sizes.Some thresholds to respond grain sizes of some land cover types were revealed,such as grain sizes 10,32 and 128 in this study.The results showed that landscape heterogeneities were related to grain sizes.Indices of landscape were variable under different grain sizes,such as indices to describe composing,ratio,shape,and congregating.These indices were divided into three types: stable,decreasing,and fluctuating(increasing then decreasing) with the grain sizes.The indices describing dimensional fractions of landscape(FRAC_AM and PAFRAC) varied.
【Fund】: 中山大学985工程环境污染控制技术创新平台资助项目~~
【CateGory Index】: X171.1
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