关键词: 米槠, 杉木, 细根, 生产力, 生物量

Abstract: 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.

Key words: Castanopsis carlesii, Cunninghamia lanceolata, fine root, production, biomass.