Pathways driving bound OC% changes after wetland drainage and the effect size of environmental variables (IMAGE)
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To disentangle the direct and indirect pathways driving bound OC variations, structural equation modelling (SEM) was constructed. Based on the SEM, reactive iron and aluminum (hydr)oxides exerted a dominant, direct effect on bound OC% in both types of wetlands, followed by soluble phenols. Soil pH had no significant direct influence. In the non-Sphagnum wetlands, drainage had an overall positive effect on reactive iron and aluminum (hydr)oxides (i.e., 0.5Feo+Alo) and hence bound OC%, also via increasing soluble phenols and decreasing soil pH. By comparison, drainage negatively affected both soluble phenols and reactive iron and aluminum (hydr)oxides (mainly via decreasing ferrous iron) in the Sphagnum wetlands, thereby showing an overall negative effect on bound OC%.
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