Figure 7.
Correlation analysis between the bacterial community structure and environmental factors in the non-degraded (ND), slightly degraded (SD), and heavily degraded (HD) alpine wetland areas. (A) Distance-based redundancy analysis (db-RDA) of the soil bacterial community with environmental factors. (B) Spearman correlation analysis between the dominant bacteria phyla and environmental factors. Pairwise comparisons of the environmental factors are shown with a color gradient denoting the Spearman correlation coefficient. Taxonomic bacteria (based on the phylum level) community composition is related to each environmental factor by partial (geographic distance-corrected) Mantel tests. The edge width corresponds to the Mantel’s r statistic for the corresponding distance correlations. The edge color denotes the statistical significance based on 9,999 permutations. Note: n = 3. Coverage: total plan coverage; SM: soil moisture content; BD: bulk density; TC: total carbon; TN: total nitrogen; TP: total phosphorus; TK: total potassium; AK: available potassium; AP: available phosphorus; AN: available nitrogen.