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Table II
Regression models for the productivity of leaves, fruits, wood and total above-ground biomass obtained by linear multiple regression with two explanatory variables (Shannon Index H′ and stand age). AIC, Akaike‘s Information Criterion.
| Response variable | Explanatory variable | Coefficient | t | p | Model statistics |
|---|---|---|---|---|---|
| Leaf productivity | |||||
| Stand age | –0.207 | –0.794 | 0.463 | AIC 11.097 | |
| H′ | –0.160 | –0.914 | 0.403 | F(3,5 DF) = 0.4446 | |
| Stand age:H′ | –0.007 | –0.034 | 0.974 | p = 0.7316 | |
| Fruit productivity | |||||
| Stand age | –0.334 | –0.713 | 0.508 | AIC 21.662 | |
| H′ | –0.488 | –1.551 | 0.182 | F(3,5 DF) = 1.082 | |
| Stand age:H′ | –0.170 | –0.490 | 0.645 | p = 0.4365 | |
| Wood productivity | |||||
| Stand age | –0.411 | –1.085 | 0.328 | AIC 24.955 | |
| H′ | –1.038 | –2.976 | 0.031* | F(3,5 DF) = 3.143 | |
| Stand age:H′ | 0.202 | 0.429 | 0.686 | p = 0.1248 | |
| Total above-ground productivity | |||||
| Stand age | –0.489 | –1.310 | 0.247 | AIC 24.672 | |
| H′ | –1.580 | –4.599 | 0.006** | F(3,5 DF) = 7.402 | |
| Stand age:H′ | 0.448 | 0.965 | 0.379 | p = 0.027* |