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Table 1 Results of the structural equation modeling done to test the effects of species richness on AGC through functional diversity and functional dominance

From: Tree species diversity predicts aboveground carbon storage through functional diversity and functional dominance in the dry evergreen Afromontane forest of Hararghe highland, Southeast Ethiopia

Regression Est. std SE p value Est. std SE p-value
Partial mediation model Full mediation model
Path from S to FEve −0.44 0.10 < 0.001 −0.44 0.10 < 0.001
Path from S to FDis 0.40 0.11 < 0.001 0.40 0.11 < 0.001
Path from S to FDiv 0.12 0.13 0.356 0.12 0.13 0.356
Path from S to FRic 0.76 0.05 < 0.001 0.76 0.48 < 0.001
Path from S to CWM SLA 0.10 0.14 0.474 0.09 0.14 0.475
Path from S to CWM PHm 0.26 0.13 0.040 0.26 0.13 0.040
Path from S to CWM WD −0.15 0.13 0.275 −0.15 0.13 0.273
Path from S to AGC 0.45 0.19 0.016    
Path from FRic to AGC −0.09 0.21 0.651 0.17 0.19 0.374
Path from FEve to AGC 0.14 0.17 0.422 0.05 0.17 0.784
Path from FDiv to AGC −0.27 0.13 0.037 −0.23 0.14 0.084
Path from FDis to AGC 0.19 0.18 0.275 0.26 0.18 0.143
Path from CWM PHm to AGC −0.09 0.12 0.457 −0.07 0.13 0.618
Path from CWM WD to AGC 0.18 0.15 0.250 0.13 0.16 0.434
Path from CWM SLA to AGC −0.19 0.15 0.207 −0.17 0.16 0.298
Fit statistics
Chisq: 19.58 (p = 0.076)     Chisq: 24.63 (p = 0.026)
DF: 12     DF: 13
SRMR: 0.07     SRMR: 0.07
GFI: 0.95     GFI: 0.93
  1. AGC aboveground biomass carbon, S species richness, FRic functional richness, FEve functional evenness, FDis functional dispersion, FDiv functional divergence, CWM community weight mean, WD wood density, SLA specific leaf area, PHm maximum plant height, SE standard error, Est. std standardized estimate, Chisq Chi-square statistic, DF degree of freedom, indicating the number of paths omitted from the model, p the probability of the data given the model, p > 0.05. GFI goodness fit index, SRMR standardized root means square residual