关键词: 九顶山, 红桦种群, 空间格局, 距离方法

Abstract: In order to understand the community structure of macrofauna in the 14th Yong intertidal zone of Nansha, Guangzhou, an investigation was made at three different habitats, i.e., bare tidal flat, Sonneratia habitat, and Cyperus malaccensis habitat from 2007 to 2008, with the seasonal variations of the macrofaunal community structure at the habitats compared and analyzed. The species number, average biomass, and species richness index (d) in four seasons were all the highest at C. malaccensis habitat, the second at bare tidal flat, and the lowest at Sonneratia habitat; while the average density, species diversity index (H′), and evenness index (J) were the highest at bare tidal flat, the second at C. malaccensis habitat, and the lowest at Sonneratia habitat. ANOVA analysis showed that there was a significant difference in the species number and density among the habitats, but no significant difference in the biomass. MDS and cluster analysis showed that in spring and summer, the macrofaunal community at the three habitats was similar, but in winter, only the macrofaunal community at bare tidal flat and C. malaccensis habitat was similar. The causes for the differences in species composition and quantity among the three habitats were discussed.

Key words: Jiuding Mountain, Betula albo-sinensis population, Spatial pattern, T-square