北京东灵山暖温带落叶阔叶林群落生物多样性与地上生物量的关系

王兴煜, 孟京辉, 任思远, 祝燕

Relationship between biodiversity and aboveground biomass in the warm temperate deciduous broad-leaved forest of Donglingshan, Beijing

Xingyu Wang, Jinghui Meng, Siyuan Ren, Yan Zhu

图3 生物和非生物因子与地上生物量的结构方程模型。模型考虑了海拔(Elevation)、Pielou均匀度指数(Pielou evenness index)、功能离散度(FDis)、比叶面积群落加权平均值(CWM.SLA)、胸径Shannon指数(DBH Shannon index)和林分密度(Stand density)对地上生物量(AGB)的直接和间接影响。箭头方向表示因果关系, 实线和虚线表示作用强弱, 蓝色表示正相关, 红色表示负相关。线上的数值表示具有相应统计意义的标准化路径系数。模型评价采用比较拟合指数(CFI)、标准化残差均方和平方根(SRMR)。* P < 0.05; ** P < 0.01; *** P < 0.001。

Fig. 3 Structural equation models (SEM) of biotic and abiotic factors and aboveground biomass. The model accounting for the direct and indirect effects of elevation, pielou evenness index, functional dispersion (FDis), community weighted mean trait value of specific leaf area (CWM.SLA), DBH Shannon index and stand density on aboveground biomass (AGB). Arrows represent the flow of causality, solid and dashed lines indicate the strength of the effect, blue indicates a positive correlation, and red indicates a negative correlation. Number and its associated asterisks are standardized path coefficient and significant level. The model was evaluated using the comparative fit index (CFI) and the standardized residual mean square root (SRMR). * P < 0.05; ** P < 0.01; *** P < 0.001.