Table 4.
Relative effects (% of total variation) of temperature (T) or soil moisture (M), bedrock (B), land use (L) and their interactions on microbial growth, N mineralization, microbial organic N uptake, microbial NUE, NH4+ immobilization and nitrification with indications of significance as asterisks. Significance levels: *P < 0.05, **P < 0.01, ***P < 0.001.
| Microbial growth | Gross N mineralization | Microbial uptake | Microbial NUE | NH4+ immobilization | Gross nitrification | |
|---|---|---|---|---|---|---|
| Temperature | ||||||
| B | 0.0 | 7.3** | 1.1 | 3.2** | 10.2*** | 15.8*** |
| L | 4.6* | 2.9 | 6.1* | 0.2 | 1.5 | 17.8*** |
| T | 44.3*** | 1.1 | 43.9*** | 33.9*** | 29.0*** | 9.6** |
| B × T | 0.5 | 4.3 | 1.0 | 0.3 | 3.1 | 1.3 |
| L × T | 1.8 | 4.7 | 1.3 | 3.5* | 6.0* | 3.3 |
| B × L | 6.4* | 26.5*** | 3.9 | 40.5*** | 18.1*** | 12.1*** |
| B × L × T | 5.2 | 2.7 | 5.0 | 2.7 | 5.6* | 5.6 |
| Residuals | 37.2 | 50.4 | 37.8 | 15.6 | 26.6 | 34.6 |
| Moisture | ||||||
| B | 2.4* | 8.2** | 2.1 | 0.9 | 4.7** | 3.9** |
| L | 6.5*** | 7.2* | 10.2*** | 2.1 | 8.4** | 10.6*** |
| M | 53.3*** | 9.8** | 19.9*** | 36.4*** | 33.0*** | 25.0*** |
| B × M | 1.7 | 7.3* | 3.3 | 0.8 | 4.7* | 17.1*** |
| L × M | 0.4 | 5.6 | 2.3 | 2.5 | 1.5 | 9.8** |
| B × L | 14.8*** | 7.6* | 19.2*** | 4.6 | 0.8 | 1.7 |
| B × L × M | 2.3 | 5.8 | 7.8* | 4.2 | 17.4*** | 6.3* |
| Residuals | 18.5 | 48.5 | 35.0 | 48.5 | 29.6 | 25.6 |