Table 2.
Marginal and conditional effects of soil microbial community types on specific activities of soil extracellular enzymes involved in SOC transformation and turnover obtained from the summary of forward selection in Redundancy analysis (RDA).
| Variables | Lambda-A1 | Lambda-B2 | P3 | F-ratio4 |
|---|---|---|---|---|
| Gram-negative bacteria (G−) | 0.44 | 0.44 | 0.002 | 40.72 |
| Saprophytic fungi (Sap) | 0.40 | 0.13 | 0.002 | 15.66 |
| Actinomycetes (Actino) | 0.11 | 0.08 | 0.002 | 10.87 |
| Arbuscular mycorrhiza fungi (AMF) | 0.07 | 0.00 | 0.546 | 0.71 |
| Gram-positive bacteria (G+) | 0.06 | 0.01 | 0.552 | 0.62 |
Bold values indicate significant effects at P < 0.05.
1
Describe marginal effects, which show the variance explained when the variable is used as the only factor.
2
Describe conditional effects, which show the additional variance each variable explains when it is included in the model.
3
The level of significance corresponding to Lambda-B when performing Monte Carlo test at the 0.05 significance level.
4
The Monte Carlo test statistics corresponding to Lambda-B at the 0.05 significance level.