Research Article
Elevational Patterns of Plant Richness in the Taibai Mountain, China
Table 3
Series of second-order polynomial regressions for species richness and predictor variables.
| Plant groups | Variable | Order | df | | | | |
| Overall plants | Ln(area) | 2 | 27 | 0.63*** | 478.98 | −219.83 | 27.15 | MDE | 2 | 27 | 0.49*** | 12.55 | 1.74 | −0.001 | MAT | 2 | 27 | 0.71*** | −210.59 | 244.83 | −15.94 | MAP | 2 | 27 | 0.65*** | 729.66 | −5.79 | 0.007 |
| Seed plants | Ln(area) | 2 | 27 | 0.53*** | 374.60 | −170.74 | 20.889 | MDE | 2 | 27 | 0.41** | −2.71 | 1.95 | −0.002 | MAT | 2 | 27 | 0.63*** | −173.81 | 185.07 | −11.78 | MAP | 2 | 27 | 0.55*** | 113.53 | −3.31 | 0.004 |
| Bryophyte | Ln(area) | 2 | 27 | 0.95*** | 77.27 | −37.26 | 4.71 | MDE | 2 | 27 | 0.95*** | 9.038 | 0.85 | 0.001 | MAT | 2 | 27 | 0.96*** | −17.40 | 44.31 | −3.31 | MAP | 2 | 27 | 0.94*** | 1274.03 | −3.88 | 0.003 |
| Fern | Ln(area) | 2 | 27 | 0.42** | 27.11 | −11.84 | 1.56 | MDE | 2 | 27 | 0.24* | 9.24 | 1.37 | −0.014 | MAT | 2 | 27 | 0.82*** | −19.38 | 15.46 | −0.84 | MAP | 2 | 27 | 0.49*** | −657.91 | 1.39 | −0.0007 |
|
|
Equation for second-order polynomials following equation term = + variable + variable2; df = degrees of freedom; *, **, and ***.
|