Table 2. Results of four-way factorial ANOVA on the effects of year (Y), warming (W), N addition (N), and their interactions on the importance value of graminoid species (IVG), the importance value of forbs (IVF); richness (R); evenness (E); diversity (H); aboveground biomass (AB); belowground biomass (BB).
| Source of variation | IVG | IVF | R | E | H | AB | BB |
|---|---|---|---|---|---|---|---|
| Block | ** | ** | * | ** | * | ** | ** |
| Year | ** | ** | ns | * | ** | ** | ** |
| W | ns | ns | ns | ns | ns | ns | ns |
| N | ** | * | * | ns | ** | ** | ** |
| Y×W | ns | ns | * | ns | ns | ns | ns |
| Y×N | ns | * | ns | ns | ns | ** | ns |
| W×N | * | ** | ns | ns | ns | ns | ** |
| Y×W×N | ns | ns | ns | ns | ns | ns | ns |
* P<0.05,
** P<0.01, “ns” indicates that the differences are not significant.