毛竹林下植物沿海拔梯度分布的DCCA研究

采用梯度格局法研究毛竹林下植物沿海拔梯度的分布与环境因子之间的关系,对毛竹林下植物的分布和各环境因子进行去趋势典范对应分析(DCCA)。结果表明,灌木层、层间层、草本层的DCCA排序axes1效果和总体效果均为显著,其DCCA前2个排序轴特征值分别占总特征值的65.1%、65.6%、62.6%,排序效果良好;结合环境因子间的相关关系和DCCA排序结果,海拔对毛竹林下植物分布起决定性作用,其次是坡向,而坡度和坡位与林下植物的分布规律间的关系不明显。

Detrended canonical correspondence analysis of understory plants distribution in Phyllostachys edulis forest along altitudinal gradient

Detrended canonical correspondence analysis (DCCA) was used to detect the correlation between the distribution of understory plant species and the environmental factors in Phyllostachys edulis forest with the gradient pattern method. The results were as follows: The DCCA axes1 efficiency of the shrub layer, interlayer and herb layer was significant, so as the total efficiency. The cumulative percentage variance of species-environment relation of the first two axises were 65.1%, 65.6%, 62.6%, respectively, meaning the good ordinational result. According to the correlations among environment factors and results of the DCCA ordination, the most important factor affecting understory plant distribution in this region was elevation, followed by slope aspect, but slope gradient and slope position had no significant relation with species distribution.