广东顺德人工林群落物种多样性与影响因子

Study on the relation between Species Diversity of forest Plantation Communities and affecting factors in Guangdong

对顺德区五种人工林群落物种多样性与立地条件、胸径关系进行了定量研究.结果表明,（1）郁闭度与乔木物种多样性呈显著正相关;（2）土壤因子中代换性Ca2＋、pH、NO3-、代换性Mg2＋对物种多样性与均匀度有显著影响,并建立了回归方程;（3）树高与乔木层物种多样性呈显著相关,与其它各层相关性不显著;（4）胸径变化趋势较复杂,乔木层S指数与胸径有显著相关,灌木层与胸径相关性不显著,草本层SP、PIE指数与胸径有显著相关性.

The investigations on the relation between the site factors and species diversity were carried out in this paper. The results were as follows： Firstly, there is a limit significant correlation between the canopy density and species diversity. Secondly, the positive correlation between Ca2＋, pH, NO3- ,Mg2＋ with the species diversity was showed, and had established regression equation. Thirdly, the significant correlation between tree height and species diversity in the arbor layer was showed, but, the difference was no significant with the other layers. At last, the variety of DBH was complex, the significant correlation was showed between the S index and the DBH, but, no significant correlation was showed between the shrub layer and the DBH, the limit significan was also showed in the SP and PIE index of the herb layer.