Fig. 4: Effects of abiotic and biotic factors on the normalized Rs change.
From: Enhanced response of soil respiration to experimental warming upon thermokarst formation
a, SEM of the direct and indirect pathways that link to the normalized Rs 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 PCA of the variables listed inside 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 variables inside 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. b, Standardized direct effects of substrate quality, abundance of microbial functional genes and indirect effects of edaphic variables (clay+silt and soil moisture) on the normalized Rs change.
