粒度效应对城-乡过渡区景观格局分析的影响

以TM遥感数据为数据源，应用地理信息系统技术，对哈尔滨市区至帽儿山天然次生林区之间的过渡区域进行了景观格局分析，选取的景观空间格局度量指标包括：景观边缘密度、平均分维数、景观多样性、均匀性。比较了不同粒度对景观格局指数计算结果的影响，结果表明：景观多样性与均匀性对粒度效应反应不敏感；景观边缘密度、平均分维数都具有随着空间粒度的增加而明显变小的趋势，是对粒度效应比较敏感的参数。但在不同粒度下，依靠景观边缘密度、平均分维数计算的城-乡景观格局梯度的变化趋势基本没有改变。

The Influence of Grain Effect on the Analysis of Landscape Pattern Gradient along Urban - rural Transect

The landscape patterns along the urban-rural transect from Harbin to Maoershan natural secondary forest region were analyzed with the help of TM data and GIS. The measured indexes of landscape patterns include edge density, fractal dimension, diversity and evenness of landscape. The effects of different grains on the calculation result of landscape pattern index were compared. The result shows that diversity and evenness indexes of landscape are not sensitive to grain, while edge density and fractal dimension show obvious declining tendencies with grain increasing. However the grain does not show any effect on the gradient of landscape pattern calculated by edge density and fractal dimension along the urban-rural transect.