Table 6 Coefficients of regression (± standard error) for simultaneously fitted models
From: Allometric equations for estimating belowground biomass of Androstachys johnsonii Prain
Root component | Weight function | b10 (±SE) | b11 (±SE) | b12 (±SE) | b20 (±SE) | b21 (±SE) |
|---|---|---|---|---|---|---|
Using DBH and TH as independent variables | ||||||
 Taproot | 1/0.0002 × DBH3.7421 | 0.0101 (±0.0072)ns | 1.7737 (±0.1439)*** | 0.8910 (±0.3949)* |  |  |
 Lateral roots | 1/0.0002 × DBH3.7421 |  |  |  | 0.0011 (±0.0004)* | 1.1703 (±0.385)*** |
 Root system | 1/0.0002 × DBH3.7421 | Taproot model + lateral roots model |  |  |  | |
Using only DBH as independent variable | ||||||
 Taproot | 1/0.0002 × DBH3.6194 | 0.0430 (±0.0106)*** | 2.0567 (±0.0849)*** |  |  |  |
 Lateral roots | 1/0.0002 × DBH3.6194 |  |  |  | 0.0090 (±0.0024)*** | 2.6368 (±0.0252)*** |
 Root system | 1/0.0002 × DBH3.6194 | Taproot model + lateral roots model |  |  |  | |
Using only RCD as independent variable | ||||||
 Taproot | 1/0.0002 × RCD3.6082 | 0.0269 (±0.0074)*** | 2.1454 (±0.0910)*** |  |  |  |
 Lateral roots | 1/0.0002 × RCD3.6082 |  |  |  | 0.0048 (±0.0014)** | 2.7624 (±0.0947)*** |
 Root system | 1/0.0002 × RCD3.6082 | Taproot model + lateral roots model |  |  |  | |