图3. 长白山温带森林不同演替阶段功能多样性的变化趋势。PBF, 次生杨桦林; CBF, 次生针阔混交林; TKF, 原始椴树红松林。箱型图为重复抽样20次的结果, 黑色三角为样方水平数值; 不同小写字母为多重比较的结果, 表示差异显著(p ＜ 0.05)。

Fig. 3. Trends in functional diversity at different successional stages in temperate forests of Changbai Mountains. PBF, secondary poplar and birch mixed forest; CBF, secondary mixed conifer and broad-leaved forest; TKF, primary Tilia amurensis-Pinus koraiensis mixed forest. FEve, functional uniformity; FDiv, functional divergence; FDis, functional dispersion; RaoQ, functional entropy index. The box plots show the results of repeated sampling for 20 times. The black triangle is the value at plot level; different lowercase letters show the results of multiple comparisons, and it indicate significant difference (p ＜ 0.05).