Table 2.
ANOVA results (F values) of leaf functional traits in response to N and water addition
| Pnet | gs | SPAD | LNC | DMC | C/N ratio | δ13C | |
|---|---|---|---|---|---|---|---|
| Year (Yr) | 450·27**** | 125·14**** | 93·25**** | 173·32**** | 1942·24**** | 124·36**** | 27·56**** |
| Species (Sp) | 2·27* | 3·94* | 1307·72**** | 238·24**** | 822·01**** | 49·72**** | 2050**** |
| Water (W) | 135·21**** | 41·94**** | 248·82**** | 300·15**** | 234**** | 131·22**** | 6·37*** |
| Nitrogen (N) | 5·27** | 1·14 | 37·54**** | 400·6**** | 114·96**** | 126·55**** | 2·63* |
| W × N | 6·17** | 1·66 | 39·21**** | 17·41**** | 29·34**** | 26·14**** | 0·03 |
| Yr × N | 1·41 | 1·24 | 0·47 | 50·77**** | 11·26**** | 0·44 | 0·86 |
| Yr × W | 10·15*** | 1·24 | 43·77**** | 176·07**** | 48·64**** | 99·15**** | 0·34 |
| Yr × Sp | 4·43** | 5·24** | 7·59**** | 34·2**** | 25·64**** | 8·91**** | 1·52 |
| Sp × W | 0·05 | 1·54 | 4·08*** | 6·54**** | 8·11**** | 1·4 | 1·24 |
| Sp × N | 0 | 0·04 | 1·57 | 11·33**** | 4·73*** | 5·24**** | 1·5 |
| Sp × W × N | 0·53 | 0 | 2·87** | 0·96 | 0·87 | 0·46 | 1·09 |
| Yr × Sp × W × N | 0·50 | 1·03 | 1·53* | 2·36*** | 1·43 | 3·23**** | 0·77 |
Pnet, net photosynthetic rate based on area; gs, stomatal conductance; SPAD, estimated leaf chlorophyll concentration; LNC, leaf nitrogen content; DMC, leaf dry matter content; C/N ratio, ratio of leaf carbon to nitrogen contents; δ13C, leaf carbon isotopic composition.
Asterisks indicate statistically significant differences at *P < 0·10, **0·05, ***0·01, and ****0·001.