Fig. 2
From: Global ecological predictors of the soil priming effect
Ecological predictors of the apparent soil priming effect. Structural Equation Model (SEM) describing the effects of multiple ecological predictors on the apparent soil priming effect (n = 69). Numbers adjacent to arrows are indicative of the effect size (p < 0.05) of the relationship. R2 denotes the proportion of variance explained. Climate, soil properties and vegetation predictors are included in our models as independent observable variables; however, we group them in the same box in the model for graphical simplicity. Soil carbon (C) associated variables (soil microbial respiration and soil organic C content) are included as a composite variable in our model (hexagon). F = forest. G = Grasslands. SHR = Shrublands. C + S = Clay + silt. EC = Salinity. Resp = Basal microbial soil respiration. Basidio = % of Basidiomycota. Verruco = % of Verrucomicrobia. Armati = % of Armatimonadetes. Chytridio = % of Chytridiomycota. Pcov = % of plant cover. ARI = Aridity (i.e., 1-ARI). Locations with a higher aridity also support lower water availability). MAT = Mean annual temperature. There was a non-significant deviation of the data from the model (χ2 = 3.97, df = 2; p = 0.14; RMSEA p = 0.18)
