Table 1.
The mean (±s.e.) nitrogen content (%) and mass (Mg ha−1) of P. schreberi and H. splendens in response to 16 years of experimental N addition treatments (0, 12.5 and 50 kg N ha−1 yr−1). Data were compared using ANOVA, and significant post hoc differences are indicated by different letters within each row (a, b or c).
| 0 kg N ha−1 yr−1 | 12.5 kg N ha−1 yr−1 | 50 kg N ha−1 yr−1 | F-value | p-value | |
|---|---|---|---|---|---|
| N content (%) | |||||
| P. schreberi | 1.33 (0.08)a | 1.16 (0.04)a | 2.27 (0.09)b | 66.643 | <0.001 |
| H. splendens | 1.36 (0.05)a | 1.33 (0.069)a | 2.39 (0.08)b | 70.687 | <0.001 |
| mass (Mg ha−1) | |||||
| P. schreberia | 2.55 (0.33)c | 2.17 (0.32)b | 1.50 (0.13)a | 4.425 | 0.031 |
| H. splendens | 1.69 (0.16)c | 1.11 (0.10)b | 0.51 (0.05)a | 26.145 | <0.001 |
| totala | 4.25 (0.40)b | 3.27 (0.38)ab | 1.97 (0.12)a | 14.871 | <0.001 |
aData were transformed (log (x + 1)) to meet parametric assumptions prior to statistical analysis.