Table 3. Significant drivers of microbial community evenness (Shannon diversity) from mixed model ANOVA results (reported as P-values).
| df |
Drought |
Nitrogen addition |
|||
|---|---|---|---|---|---|
| χ2 | P-value | χ2 | P-value | ||
| Bacterial community | |||||
| Year | 1 | NS | NS | NS | NS |
| Season | 7 | 44 | <0.001 | 37.8 | <0.001 |
| Treatment | 1 | NS | NS | NS | NS |
| Treatment × season | 7 | 12.3 | 0.09 | NS | NS |
| Block | 1 | 7.21 | <0.01 | 12.4 | <0.001 |
| Fungal community | |||||
| Year | 1 | NS | NS | NS | NS |
| Season | 7 | 86.7 | <0.001 | 84.8 | <0.001 |
| Treatment | 1 | NS | NS | NS | NS |
| Treatment × season | 7 | 23.3 | <0.01 | NS | NS |
| Block | 1 | 6.4 | 0.01 | 3.66 | 0.06 |
Abbreviations: ANOVA, analysis of variance; NS, not significant.
Season and Treatment terms are treated as fixed factors, while Year and Block are treated as random factors. The variable Season is nested within Year.