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. 2022 Oct 6;12:16769. doi: 10.1038/s41598-022-21089-4

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Component plotting of multiple variables including soil organic carbon content (%) based on the principal component analysis (PCA). (A) PCA plot with observations; (B) Correlations between principal components and predictor variables. AGB = aboveground biomass, LU = land use, BD = soil bulk density (g cm⁻³), Eh = soil oxidation–reduction potential (ORP, mV), SOC = soil organic carbon concentrations (%).