Extended Data Fig. 10: Effects of abiotic and biotic factors on the normalized potential heterotrophic respiration (Rhp) change.
From: Enhanced response of soil respiration to experimental warming upon thermokarst formation
a, Structural equation model (SEM) of the direct and indirect pathways that affect the normalized Rhp change. b, Standardized direct effects of substrate quality and the abundances of microbial functional genes and the indirect effects of edaphic variables (clay+silt and soil moisture) on the normalized Rhp change. Solid and dotted arrows represent positive and negative relationships, respectively. Arrow width is proportional to the strength of the relationship. The numbers adjacent to the arrows denote standardized path coefficients. Substrate quality is the first component from the principal component analysis (PCA) conducted with the factors listed in the rectangles, with “↑” and “↓” indicating positive and negative correlations between the factors and the first component, respectively. Microbial functional genes represent the weighted average of the first and second components from the PCA of the factors in the rectangle, with “↑” indicating a positive correlation between the factors and the weighted average of the first and second components. *, P < 0.05; **, P < 0.01; ***, P < 0.001. AIC, Akaike information criterion.
