Table 2.
Root number, total length of roots and ratio of root surface area to volume (A:V) of root-flooded A. philoxeroides under different nutrient and dissolved oxygen levels (mean ± s.e., n = 10).
| Treatment | Number of first order roots (#) | Total length of roots (cm) | A:V (cm2 cm-3) | |
|---|---|---|---|---|
| Nutrient level | 5% | 34.6 ± 4.1 a | 1183.2 ± 141.4 a | 301.7 ± 9.3 a |
| 50% | 31.4 ± 2.3 a | 722.3 ± 108.6 b | 206.2 ± 4.5 b | |
| 100% | 32.4 ± 3.7 a | 646.1 ± 114.9 b | 207.0 ± 9.8 b | |
| Dissolved oxygen level | 5% | 31.9 ± 3.8 a | 269.0 ± 47.2 a | 235.6 ± 7.9 a |
| 50% | 31.4 ± 2.7 a | 499.2 ± 55.5 b | 263.1 ± 7.6 a | |
| 100% | 44.8 ± 4.2 b | 628.6 ± 75.5 b | 201.1 ± 9.9 b | |
The set-up of nutrient and dissolved oxygen levels was the same as that in Table 1. Values within each column with different superscripts are significantly different at P < 0.05.