Table 1.
BRT analysis for the influence of ecosystem type, soil type, leaf type (broadleaves versus coniferous) and soil nutrients on fine root production. In the model, predictors with large values in influence mean that they have more explanatory power. Total, all predictors; overall, all ecosystems; forests, all forests (boreal + temperate/subtropical + tropical), grasslands, all grasslands (temperate + tropical/savannah).
| predictor | deviance (%) |
||
|---|---|---|---|
| overall | forests | grasslands | |
| ecosystem type | 19.72 | 14.22 | 1.71 |
| soil type | 28.29 | 23.70 | 41.32 |
| leaf type | 0.05 | 0.87 | — |
| soil chemistry | 22.04 | 28.19 | 15.44 |
| pH | 3.24 | 1.30 | 0 |
| organic matter | 0.08 | 0.22 | 0 |
| total carbon | 3.07 | 6.76 | 0 |
| total nitrogen | 9.70 | 10.60 | 13.61 |
| total phosphorus | 3.72 | 5.39 | 1.05 |
| available nitrogen | 1.41 | 2.41 | 0 |
| available phosphorus | 0.83 | 1.50 | 0 |
| total | 70.11 | 66.98 | 58.47 |