格氏栲天然林群落结构特征及多样性分析

Community Structure and Diversity Analysis of Castanopsis kawakamii Natural Forest

为了解不同立地条件下格氏栲天然林群落结构与物种多样性之间的耦合关系,对福建三明格氏栲自然保护区内不同坡位、坡向下格氏栲群落进行研究。结果表明,试验区共记录到植被94种,隶属于47科75属。乔木层个体生长状况在下坡位阳坡较好,灌草层的盖度随坡位的升高而降低,坡向对更新层植被生长影响较大。下坡位林下物种多样性指数更高,且乔木层植被生长特征值越大,林下植被物种多样性指数越大。冗余分析(RDA)表明,群落物种多样性的高低同时受到地形因子和群落结构的影响。与单因素方差分析结果一致,相比于坡向,坡位对群落结构和多样性的影响更大。

To understand the coupling relationship between community structure and species diversity of Castanopsis kawakamii natural forest under different site conditions,we studied the C.kawakamii communities at different slope positions and aspects in Sanming Nature Reserve,Fujian Province.The results showed that a total of 94 vegetation species belonging to 47 families,75 genera were recorded in the study area.The individual growth index of tree layer reached the maximum in the lower slope and sunny slope direction,the coverage of shrub and herb layer decreased with the increase of slope position,and the slope direction had great influence on the vegetation growth of regeneration layer.The species diversity index in downslope position was higher.The better of tree layer vegetation,the greater the species diversity index of understory vegetation.Redundancy analysis(RDA)showed that species diversity was related to topographic factors and community structure,which was consistent with the results of one-way ANOVA:the effect of slope position on community structure and diversity was greater than that of slope aspect.