Table 1. Physicochemical properties of submerged P. crispus rhizosphere and non-rhizosphere sediment and interstitial water. Values are means (SD); n = 12.
Sample | NO3− − N mg l−1 | NH4+ − N mg l−1 | pH | Dop mm |
---|---|---|---|---|
R | 0.30 ± 0.14b | 10.61 ± 7.80a | – | – |
N1 | 1.34 ± 1.61a,b | 11.09 ± 8.30a | 7.62 ± 0.14a | 14.4 ± 6.6a |
N2 | 1.46 ± 1.66a | 12.38 ± 9.39a | 7.59 ± 0.22a | 12.3 ± 4.7a |
N3 | 1.23 ± 1.26a,b | 11.97 ± 8.74a | 7.56 ± 0.23a | 11.2 ± 5.2a |
N4 | 0.79 ± 0.59a,b | 13.28 ± 9.49a | 7.60 ± 0.20a | 10.6 ± 4.5a |
N5 | 1.25 ± 1.65a,b | 12.85 ± 8.84a | 7.59 ± 0.20a | 10.8 ± 4.5a |
Non | 0.39 ± 0.16b | 10.90 ± 8.16a | * | * |
Notes:
R and Non represent sediment samples in root compartment and non-rhizosphere compartment, respectively. N1–N5 represent sediment samples taken from one to five mm of near-rhizosphere sub-compartments.
– Indicates that the root system hindered microelectrode measurement in the root compartment.
Different letters after values in the same column indicate significant difference (P < 0.05).
Indicates that the non-rhizosphere was not measured.