图3. 桂林岩溶石山青冈群落主要木本植物功能性状在个体(A)和物种(B)水平上的主成分分析。图中各功能性状缩写同表1。平衡贡献圈(图中黑色圆圈)的半径代表变量的向量长度对排序的平均贡献率。红色实线为向量长度超过平衡贡献圈半径的功能性状, 代表它对该排序空间的贡献大于所有变量的平均贡献。

Fig. 3. Principal component analysis (PCA) at the individual level (A) and species level (B) between plant functional traits of the main woody plant species of the Cyclobalanopsis glauca community in the karst hills of Guilin, southwest China. The abbreviations of plant functional traits are shown in Table 1. The radius of the equilibrium contribution circle (black circle in the figure) represents the average contribution rate of the variable’s vector length to the sorting space. The variables that have vectors longer than the radius of the equilibrium contribution circle are shown by red solid line, indicating that its contribution to the sorting space is greater than the average contribution of all variables.