Table 2.
Effect of climatic and edaphic conditions on interior Douglas-fir ectomycorrhizal fungal species community composition across five regions assessed by (A) PERMANOVA and (B) assessed by multivariate generalized linear model. Effect of climatic and edaphic conditions on (C) exploration types assessed by PERMANOVA.
| (A) Ectomycorrhizal fungal community composition, PERMANOVA model | ||||
|---|---|---|---|---|
| Abiotic factors | Df | Pseudo F | Pseudo R2 | P-value |
| MAPa | 1 | 2.38 | 0.03 | <0.01 |
| MATb | 1 | 2.94 | 0.04 | <0.01 |
| soil C:Nc | 1 | 2.48 | 0.03 | <0.01 |
| pH | 1 | 1.79 | 0.02 | 0.02 |
| Residuals | 69 | 0.88 | ||
| Total | 73 | 1.00 | ||
| (B) Ectomycorrhizal fungal community composition, multivariategeneralized model | ||||
| Abiotic factors | Res.Df | Df.diff | Deviance | P-value |
| (Intercept) | 61 | |||
| MAP | 59 | 1 | 121.37 | 0.01 |
| MAT | 60 | 1 | 61.90 | 0.01 |
| Soil C:N | 58 | 1 | 98.22 | 0.04 |
| pH | 57 | 1 | 102.44 | 0.05 |
| (C) Ectomycorrhizal fungal exploration type, PERMANOVA model | ||||
| Abiotic factors | Df | Pseudo F | Pseudo R2 | P-value |
| MAP | 1 | 5.4 | 0.07 | <0.01 |
| MAT | 1 | 4.5 | 0.05 | <0.01 |
| soil C:N | 1 | 3.94 | 0.05 | 0.01 |
| Residuals | 69 | 0.83 | ||
| Total | 72 | 1.00 | ||
Significant P-values (<0.05) are shown in bold. A negative binomial distribution was assumed for the multivariate model and explained deviance was tested after 999 permutations. aMAP, mean annual precipitation; bMAT, mean annual temperature; csoil C:N, soil carbon-to-nitrogen ratio.