Table 3.
The effect of rainfall input and year on the root increment, roots, rhizomes, and total below-ground biomass (TBB): results of repeated measures analysis of variance (ANOVA), using years as repeated measures factor (NS: not significant, *P < 0.05, **P < 0.01, ***P < 0.001; df error = 84).
| Effect | Root increment | Rhizomes | Roots | TBB | |||||
|---|---|---|---|---|---|---|---|---|---|
| df | F | P | F | P | F | P | F | P | |
| Lowland grassland | |||||||||
|
| |||||||||
| Rainfall input | 2 | 8.0 | ** | 4.5 | * | 2.0 | NS | 2.4 | NS |
| Year | 4 | 12.4 | *** | 0.9 | NS | 1.9 | NS | 2.6 | * |
| Interaction | 8 | 1.5 | NS | 2.1 | * | 1.8 | NS | 1.2 | NS |
|
| |||||||||
| Highland grassland | |||||||||
|
| |||||||||
| Rainfall input | 2 | 2.5 | NS | 7.8 | ** | 12.9 | *** | 14.5 | *** |
| Year | 4 | 8.8 | *** | 1.7 | NS | 10.8 | *** | 4.5 | ** |
| Interaction | 8 | 1.0 | NS | 1.6 | NS | 1.3 | NS | 0.8 | NS |
|
| |||||||||
| Mountain grassland | |||||||||
|
| |||||||||
| Rainfall input | 2 | 9.3 | ** | 1.2 | NS | 2.7 | NS | 5.4 | NS |
| Year | 4 | 11.0 | *** | 3.2 | * | 19.7 | *** | 10.8 | *** |
| Interaction | 8 | 1.6 | NS | 0.1 | NS | 0.7 | NS | 0.4 | NS |