图2. 用于测试物种丰富度、胸径变异系数、物种异步性和优势物种稳定性对温带针阔混交林群落生物量稳定性(A)、生物量平均值(B)和生物量标准差(C)相对影响的结构方程模型。检验参数: p = 0.692, 比较拟合指数(CFI) =1.000, 标准化均方根残差(SRMR) = 0.002。实线箭头表示显著路径, 虚线箭头表示不显著路径; 黑色为正, 灰色为负。对于每条路径, 都展示了标准化回归系数。箭头的粗细反映了标准化回归系数的大小。R²表示解释的方差比例。*, p < 0.05; **, p < 0.01; ***, p < 0.001。

Fig. 2. Structural equation models for testing the relative effects of species richness, coefficient of variation of diameter at breast height (CV_DBH), species asynchrony and dominant species stability on community biomass stability (A), mean biomass (B) and standard deviation of biomass (SD_biomass)(C) in a temperate coniferous and broadleaved mixed forest. The test parameters were p = 0.692, comparative fit index (CFI) = 1.000, standardized root mean square residual (SRMR) = 0.002. Solid arrows represent significant paths and dashed arrows represent non-significant paths (black = positive; grey = negative). For each path, the standardized regression coefficient is shown. The thickness of the arrows reflects the magnitude of the standardized regression coefficients. R² denotes the proportion of variance explained. *, p < 0.05; **, p < 0.01; ***, p < 0.001.