景观格局指数相关性的幅度效应  

Range effect of the correlations among landscape metrics

作　　者：王艳芳[1] 沈永明[1] 陈寿军[1] 吴德力[1] 

机构地区：[1]南京师范大学地理科学学院,南京210046

出　　处：《生态学杂志》2012年第8期2091-2097,共7页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(40401059;40973053)资助

摘　　要：以TM遥感图像为数据源,选择江苏盐城大丰地区一块1764km2的研究区,运用地理信息系统技术处理得到该研究区的景观类型图,选取景观水平上4种类型的32个景观指数进行计算,分析了不同幅度对景观指数间相关关系的影响。结果表明:随着研究幅度由0.5km到14km的逐渐增加,同类型景观指数间相关性幅度效应最为显著的为面积、周长、密度指数,其次是蔓延度、指数和形状指数,最后是多样性指数;不同类型景观指数间相关关系的幅度效应中,面积、周长、密度指数与其他类型指数间的相关关系较好,形状指数与多样性指数间的相关性则较差;且大部分景观指数间相关关系发生质变的空间幅度为3km×3km后,且随着研究幅度的增加,大部分发生质变的指数逐渐表现出不相关。该研究为不同幅度下景观指数的选取提供了参考。Taking Landsat TM image as the data source, an area with a size of 1764 km2 in the Dafeng District of Yancheng City, Jiangsu Province of East China was selected as the study area, and a landscape type map was generated with the help of GIS technology. At landscape level, 32 landscape metrics of 4 types were selected and calculated, and the range effect of the correlations among the landscape metrics was analyzed. With the range increased from 0.5 km to 14 km, the range effect of the correlations among the landscape metrics of the same types was most significant for area, perimeter, and density metrics, followed by contagion metrics, shape metrics, and diversity metrics. In the range effect of the correlations among the landscape metrics of different types, the area, perimeter, and density metrics had significant correlations with other metrics, while the shape metrics had a poor correlation with diversity metrics. An obvious qualitative change of the correlations among the landscape metrics occurred when the range increased to 3 km × 3 km, and, with the further increase of the range, the majority of the metrics would be uncorrelated. This study provided reference for the selection of landscape metrics at different ranges.

关 键 词：景观格局指数 相关关系 幅度效应 景观生态 

分 类 号：P901[天文地球—自然地理学]