Table 2. The final optimal general linear models (GLMs) and the contribution of factors.
Factors include soil temperature (ST,∘C), soil water content (SWC, g/cm3), soil organic carbon (SOC, mg/cm3), soil total nitrogen (STN, mg/cm3) and root biomass (RBM, g/m2) to CH4flux (µg/m2/h), CO2 flux (mg/m2/h) and N2O flux (µg/m2/h).
| GHG | Factor | df | Type I SS | Contribution (%) | F | P |
|---|---|---|---|---|---|---|
| CH4 | SWC | 1 | 1,104.51 | 37.28 | 34.47 | <0.0001 |
| Error | 58 | 1,858.44 | 62.72 | |||
| CO2 | SWC | 1 | 696,778.94 | 64.86 | 224.75 | <0.0001 |
| ST | 1 | 158,944.53 | 14.80 | 51.27 | <0.0001 | |
| SOC | 1 | 44,915.24 | 4.18 | 14.49 | 0.0004 | |
| Error | 56 | 173,616.20 | 16.16 | |||
| N2O | SWC | 1 | 251.37 | 67.23 | 212.86 | <0.0001 |
| ST | 1 | 16.38 | 4.36 | 13.87 | 0.0005 | |
| SOC | 1 | 34.43 | 9.21 | 29.15 | <0.0001 | |
| RBM | 1 | 6.75 | 1.81 | 5.72 | 0.0202 | |
| Error | 55 | 64.95 | 17.37 |
Notes.
Final models
- CH4 flux
- 3.31–60.11 SWC (R 2 = 0.3728)
- CO2 flux
- −29.50 −473.10 SWC + 17.45 ST + 10.48 SOC (R 2 = 0.8384)
- N2O flux
- −2.27 −11.98 SWC + 0.24 SOC + 0.21 ST + 0. 37 ×10−2 RBM (R 2 = 0.8263)