Table 2.
Analysis of covariance testing for response of the natural logarithm of total biomass of seedlings to [CO2] (ppm), temperature regime, soil moisture regime, and mesh treatment after adjustment for PAR (µmol/m2/s) nested within run
| ANCOVA: AIC = 238.4 | ||
|---|---|---|
| Effect | F-value | P > F |
| [CO2] | 6.9 | 0.0094 |
| Temperature | 10.16 | 0.0017 |
| [CO2] × Temperature | 4.09 | 0.0448 |
| Soil moisture | 22.97 | <.0001 |
| [CO2] × Soil moisture | 0.19 | 0.8286 |
| Temperature × Soil moisture | 0.13 | 0.8762 |
| [CO2] × Temperature × Soil moisture | 0.85 | 0.4279 |
| Mesh | 0.16 | 0.8537 |
| [CO2] × Mesh | 0.69 | 0.5019 |
| Temperature × Mesh | 0.53 | 0.5921 |
| [CO2] × Temperature × Mesh | 0.75 | 0.4736 |
| Soil moisture × Mesh | 2.46 | 0.0475 |
| [CO2] × Soil moisture × Mesh | 0.21 | 0.9353 |
| Temperature × Soil moisture × Mesh | 0.12 | 0.9765 |
| [CO2] × Temperature × Soil moisture × Mesh | 1.13 | 0.3397 |
| Covariates | ||
| PAR (2007–2008) (µmol/m2/s) | −3.61 | 0.0004 |
| PAR (2008–2009) (µmol/m2/s) | −3.71 | 0.0003 |
Note. The coefficient signs are only given for continuous variables.