TABLE 2.

Factors influencing the fungal alpha diversity described by the Shannon index or phylogenetic diversity (NRI)^a

Diversity measure and factor (unit)	R2	Estimate	P valueb	WAIC
Shannon index (R2 = 0.31)
CaCO3 (mg kg−1)	0.13	−0.3225	**	1
Elevation (m)	0.04	0.6272	**	0.8
Annual rainfall (mm)	0.03	−0.6056	*	0.74
No. of freezing days/year	0.03	−0.2477	*	0.51
Corg (mg kg−1)	0.02	0.1529		0.4
pH	0.03	0.2443		0.22
Pa (mg kg−1)	0.06	−0.2367		0.15
K (mg kg−1)	0.02	0.1844		0.07
Phylogenetic diversity (R2 = 0.32)
Extensive vs organic system	0.27	−0.2682	**	1
Extensive vs conventional system		0.2719	**
Annual rainfall (mm)	0.07	−0.1953	*	0.54

^aThe table shows the coefficient of determination (R²) and the standardized regression coefficients estimated from ordinary least-squares multiple regression (OLS) of the minimum adequate model (MAM) with the lowest AIC. The relative importance of each predictor variable was assessed using the summed Akaike weights (WAIC).

^b*, P < 0.05; **, P < 0.01.