FIGURE 4 Principal component analysis of soil properties.
FIGURE 5 Pearson correlation coefficients among the soil properties, plant biomass, and organic carbon and TN stocks. Red represents positive correlations and blue represents negative correlations. Significance differences are as follows: *** P < 0.001, ** P < 0.01, * P < 0.05. SD, sol bulk density; SOC, soil organic carbon; DOC, dissolved organic carbon; LOC, labile organic carbon; TN, soil total nitrogen; TP, total phosphorus; C/N, SOC to TN ratio; C:P, SOC to TP ratio; N:P, TN to TP ratio; AGB, aboveground biomass; RB, root biomass; R/S, root to shoot ratio; SOCs, soil organic carbon stocks; STNs, soil total nitrogen stocks; EOCs, ecosystem organic carbon stocks; ENs, ecosystem total nitrogen stocks.
TABLE 2 Ecosystem organic carbon and nitrogen stocks and proportion of soil and biomass (%).