Table 2.
Repeated measurement MANOVA for testing for time, herbicide type, dose and their interactions on the diversity index of the plant community.
| Index | Source of variation | d. f. | Pillai’s Trace | Mean | F ratio | P value |
|---|---|---|---|---|---|---|
| Value (Error d. f.) | Square | |||||
| Margalef | T | 11 | 0.971(14) | — | 42.167 | <0.001*** |
| species | HT | 1 | — | 0.066 | 0.493 | 0.489 |
| richness | HD | 3 | — | 1.378 | 10.229 | <0.001*** |
| index | T×HT | 11 | 0.466 (14) | — | 1.111 | 0.419 |
| T×HD | 11 | 1.341(48) | — | 1.176 | 0.299 | |
| T×HT×HD | 33 | 0.867(48) | — | 0.591 | 0.943 | |
| Shannon- | T | 11 | 0.986(14) | — | 89.088 | <0.001*** |
| Wiener | HT | 1 | — | 0.036 | 0.301 | 0.588 |
| index | HD | 3 | — | 0.649 | 5.479 | 0.005** |
| diversity | T×HT | 11 | 0.384(14) | — | 0.792 | 0.646 |
| T×HD | 11 | 1.459(48) | — | 1.378 | 0.153 | |
| T×HT×HD | 33 | 0.606(48) | — | 0.368 | 0.998 | |
| Pielouinde | T | 11 | 0.945(14) | — | 21.703 | <0.001*** |
| x diversity | HT | 1 | — | <0.001 | 0.003 | 0.953 |
| HD | 3 | — | 0.266 | 5.744 | 0.004** | |
| T×HT | 11 | 0.352(14) | — | 0.691 | 0.728 | |
| T×HD | 11 | 1.401(48) | — | 1.274 | 0.219 | |
| T×HT×HD | 33 | 0.885(48) | — | 0.609 | 0.932 |
T: time, HT: herbicide type, HD: herbicide dose. d.f.: degrees of freedom; ns: not significant. *P < 0.05, **P < 0.01, and ***P < 0.001.