Table 3.
Summary of multiple regression with the lowest Akaike information criterion values for (A) node 3 and (B) node 4
| A | Model 2: D75~CF+MID | |||||
|---|---|---|---|---|---|---|
| Estimate | SE | t-value | P-value | |||
| (Intercept) | 43.96 | 11.36 | 3.87 | 2.14E-04 | *** | |
| CF | –3.13 | 0.89 | -3.52 | 6.93E-03 | *** | |
| MID | 4.67E-03 | 2.22E-03 | 2.10 | 3.88E-02 | * | |
| Multiple R2 | 0.205 | |||||
| Adjusted R2 | 0.186 | |||||
| P-value | 6.65E-05 | *** | ||||
| B | Model 2: D 75 ~TSA+AA/TCA | |||||
| Estimate | SE | t-value | P-value | |||
| (Intercept) | 20.11 | 4.95 | 4.06 | 1.09E-04 | *** | |
| TSA | -9.00 | 5.18 | –1.74 | 8.61E-02 | ||
| AA/TCA | 27.46 | 11.12 | 2.47 | 1.56E-02 | * | |
| Multiple R2 | 0.14 | |||||
| Adjusted R2 | 0.12 | |||||
| P-value | 1.83E-03 | ** |
***level of significance at P≤0.001 and **level of significance at P≤0.01. Abbreviations for the anatomical traits are given in the legend of Fig. 3. D75 stands for the rooting depth where 75% of the total coarse root length within a core can be found.