Table 5.
Linear regression coefficients by growth form
| Growth form |
Intercept (a) |
Slope (b) |
PH0: b=1 |
r2 |
n |
|---|---|---|---|---|---|
| Ferns | 0·449 n.s. | 0·800*** | n.s. | 0·45*** | 19 |
| Long-lived forbs | 0·06 n.s. | 0·970*** | n.s. | 0·73*** | 379 |
| Long-lived graminoids | 0·335* | 0·879*** | † | 0·59*** | 129 |
| Short-lived forbs | –0·001 n.s. | 0·985*** | n.s. | 0·77*** | 200 |
| Short-lived graminoids | –0·056 n.s. | 1·028** | n.s. | 0·49*** | 14 |
| Shrubs | 0·078 n.s. | 0·979*** | n.s. | 0·85*** | 132 |
| Trees | 0·523*** | 0·808*** | *** | 0·75*** | 148 |
Submerged aquatic plants not included (n < 10).
Linear model: log(LT) = a + b log[(SLA × LDMC)−1].
LT, measured leaf thickness (µm); SLA, specific leaf area (m2 kg−1); LDMC, leaf dry matter content (mg g−1).
***
P < 0·001;
**
P < 0·01;
*
P < 0·050.
†
P < 0·100
n.s., not significant.