Table 4.
Sources of intraspecific variation in root traits of C. arabica.
| Root trait | Variance decomposition | Mixed effects model | ||||
|---|---|---|---|---|---|---|
| Site | Management | Block | Error | Fixed effects r2 | Fixed effects + random effects r2 | |
| log-D | 29.1 | 18.7 | 8.4 | 43.9 | 0.0463 | 0.6158 |
| log-SRL | 36.1 | 27.5 | 3.2 | 33.2 | 0.0721 | 0.6864 |
| log-SRA | 16.9 | 29.7 | 10.9 | 42.4 | 0.0660 | 0.6337 |
| log-SRTD | 21.4 | 35.4 | 2.0 | 41.2 | 0.1045 | 0.6259 |
| log-RLD | 68.3 | 6.7 | 3.2 | 21.8 | 0.0181 | 0.7944 |
| Nroot | 27.4 | 15.6 | 16.2 | 40.8 | 0.0434 | 0.7351 |
| log-CNroot | 42.1 | 24.1 | 2.7 | 31.1 | 0.0245 | 0.7479 |
| PCA1 | 33.7 | 31.7 | 5.4 | 2.9 | 0.0148 | 0.7432 |
| PCA2 | 4.1 | 39.4 | 5.4 | 51.1 | 0.0846 | 0.4697 |
Variance decomposition was based on a nested analysis of variance, which for each trait was based on n = 62 individual-plants. The nested level explaining the highest percentage of variation in a given trait is highlighted in bold. Also presented are the explained variance associated with continuous soil variables (soil N, soil C, soil P, soil pH, and soil moisture) measured within these nested levels (“Fixed effects r2”), and the explained variance associated with both the fixed effects and random effects.