| Predictor variables | Model 1: Period 1 > 200 | Model 2: Period 1 < 200 | Model 3: Period 2 < 200+ | ||||||
| b | s.e | Beta | b | s.e | Beta | b | s.e | Beta | |
| Ave. length | −1.13 × 10−4 | 7.33 × 10−6*** | −0.61 | −9.13 × 10−6 | 3.32 × 10−6** | −0.22 | −3.06 × 10−4 | 7.70 × 10−5*** | −0.45 |
| Water depth | 9.04 × 10−5 | 3.12 × 10−5** | 0.12 | 1.71 × 10−5 | 1.10 × 10−5 | 0.13 |
|
|
|
| Density | −1.59 × 10−4 | 3.64 × 10−5*** | −0.18 | −1.75 × 10−5 | 1.36 × 10−5 | −0.10 |
|
|
|
| New culms |
|
|
|
|
|
| 3.35 × 10−3 | 1.36 × 10−3* | 0.28 |
| NH4 | −3.25 × 10−3 | 1.50 × 10−3* | −0.09 | −1.32 × 10−3 | 6.17 × 10−4* | −0.20 |
|
|
|
| SRP |
|
|
| 1.46 × 10−2 | 1.43 × 10−2 | 0.10 |
|
|
|
| TP |
|
|
|
|
|
| 6.43 × 10−2 | 2.68 × 10−2* | 0.27 |
| Dummy (site) | 1.49 × 10−3 | 7.00 × 10−4* | 0.09 |
|
|
|
|
|
|
| a | 0.0374 |
|
| 0.0463 |
|
| 0.02382 |
|
|
| R2 | 0.37 |
|
| 0.08 |
|
| 0.27 |
|
|
| F | 49.95 |
|
| 3.71 |
|
| 8.33 |
|
|
| P | <0.001 |
|
| <0.05 |
|
| <0.001 |
|
|
| Durbin-Watson statistics | 1.7876 |
|
| 2.17 |
|
| 1.7710 |
|
|