Table 2.
Intraspecific variation in roots traits of C. arabica.
| Root trait | Log-likelihood values | Descriptive statistics | |||
|---|---|---|---|---|---|
| Normal | Log-normal | Mean (± s.d.) | Range | Intraspecific cv (%) | |
| D | -10.56 | -5.86 | 1.17 (0.29) | 0.67–1.93 | 24.69 |
| SRL | -133.56 | -121.78 | 2.87 (2.10) | 0.37–9.97 | 73.23 |
| SRA | -423.43 | -395.88 | 277.2 (255.6) | 63.6–1538.9 | 81.39 |
| SRTD | -449.68 | -428.67 | 397.1 (344.5) | 29.6–1987.2 | 86.76 |
| RLD | -96.59 | -91.22 | 1.53 (1.16) | 0.09–5.17 | 75.55 |
| Nroot | -35.78 | -37.65 | 1.71 (0.43) | 0.87–2.87 | 25.46 |
| CNroot | -223.47 | -216.70 | 28.58 (8.97) | 14.14–53.69 | 31.38 |
The maximum likelihood-based model that best-describes the distribution of each trait is highlighted in bold (where n = 62 in all cases). Root traits are: root diameter (D; mm), specific root length (SRL; m g-1), specific root area (SRA; m2 kg1), specific root tip density (SRTD; tips g1), root length density (RLD; cm cm-3), root nitrogen concentrations (Nroot; %), and root carbon:N ratios (CNroot).