Table 7.
Principal Components Analysis of the eight poplar demes with respect to relative growth rate and leaf and root morphological properties.
| Variables | Axis 1 | Axis 2 | Axis 3 |
|---|---|---|---|
| EV (0.636) | EV (0.176) | EV (0.105) | |
| GROWTH-RELATED VARIABLE | |||
| Aboveground RGR | 0.484 | −0.035 | 0.858 |
| LEAF-RELATED VARIABLES | |||
| Leaf size | 0.925 | −0.167 | 0.264 |
| SLA | −0.680 | 0.434 | 0.364 |
| Leaf N concentration | 0.504 | 0.773 | −0.159 |
| ROOT-RELATED VARIABLES | |||
| Fine root diameter | 0.944 | −0.253 | −0.018 |
| SRA | −0.927 | −0.324 | 0.102 |
| SRL | −0.979 | −0.129 | 0.103 |
| Root tip abundance | −0.963 | −0.013 | 0.212 |
| RTD | −0.299 | 0.859 | 0.077 |
| Root N concentration | −0.908 | −0.146 | −0.120 |
Given are the loadings of the selected variables along the three most important explanatory axes. Eigenvalues are given in brackets in the headline. Numbers in bold mark the variables with the closest correlation to the respective axis (n = 4 – 15 individuals per deme).