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采用可变聚合法、除趋势对应分析(DCA)及典范对应分析(CCA)对楠溪江上游大源溪流域马尾松林群落类型进行划分,并探讨马尾松林群落的物种多样性。结果表明:(1)通过可变聚合法数量分类,将27个含有马尾松的样地划分为8种群落类型,8种群落类型在DCA排序图上具有明确边界,乔木层优势种是理想的森林群落数量分类依据;(2)由于研究区内森林资源受人为经营干扰严重,蒙特卡罗置换检验表明,CCA排序结果无法接受自然环境因子对物种样方的分布解释,不过结合排序轴特征值可以推测土壤有效氮含量与物种分布具有较强的相关性;(3)马尾松重要值与海拔、有效氮及有效磷均呈边缘显著性相关,与乔木层和草本层多样性呈显著负相关;(4)方差分析表明,与针阔混交林和常绿阔叶林相比,马尾松林的乔木层物种多样性明显较低,其灌木层和草本层多样性虽然较低,但与其他群落类型相比均未表现出显著性差异。
The species diversity of Pinus massoniana community in Danyuanxi watershed in the upper reaches of Nanxi River was divided by variable aggregation method, DCA and CCA, and the species diversity of masson pine community was discussed. The results showed that: (1) According to quantitative classification by variable polymerization method, 27 plots with masson pine were divided into 8 community types. Eight community types had definite boundaries on the DCA ranking map, and the dominant tree species was ideal (2) Due to serious anthropogenic disturbance in forest resources in the study area, Monte Carlo tests show that the results of CCA can not accept the distribution of species distribution by natural environmental factors. However, It can be inferred that there is a strong correlation between soil available nitrogen and species distribution. (3) Important value of Pinus massoniana is significantly correlated with elevation, available nitrogen and available phosphorus, and negatively correlated with the diversity of arborous layer and herb layer ; (4) Analysis of variance showed that the species diversity of Pinus massoniana forest was significantly lower than that of mixed coniferous-broadleaf forest and evergreen broad-leaved forest. Although the diversity of shrub layer and herb layer was lower, No significant difference compared to show.