Table 2.
Correlations between bacterial and fungal communities and root organic acids and carbon pools in the rhizosphere and roots
| Carbon pool | Bacteria | Fungi | ||||||
|---|---|---|---|---|---|---|---|---|
| Rhizosphere | Root | Rhizosphere | Root | |||||
| r | P value | r | P value | r | P value | r | P value | |
| Acetic acid | - | - | 0.174 | 0.021 | - | - | - | - |
| Oxalic acid | - | - | 0.228 | 0.006 | - | - | - | - |
| Succinic acid | - | - | 0.265 | 0.004 | - | - | - | - |
| Malic acid | - | - | 0.332 | 0.002 | - | - | - | - |
| Tartaric acid | - | - | 0.323 | 0.001 | - | - | - | - |
| Citric acid | - | - | 0.228 | 0.006 | - | - | - | - |
| ROC | 0.466 | 0.001 | 0.326 | 0.001 | - | - | - | - |
| SAC | 0.165 | 0.021 | 0.192 | 0.010 | - | - | 0.144 | 0.028 |
| SOC | - | - | 0.215 | 0.010 | - | - | - | - |
The Mantel test was performed using the Pearson correlation method. Carbon pools were calculated based on the Euclidean distance, and the microbial community structures (OTU level) were calculated based on the Bray-Curtis distance. P is the significance level. Values with P<0.05 are shown. ROC: root-released organic carbon; SAC: soil active carbon; SOC: soil organic carbon