TABLE 1.
Physicochemical properties of the sediment transectsa
| Transectb | Mean pH ± SD | Mean ammonium concn (mg kg−1) ± SD | Mean AP concn (mg kg−1) ± SD | Mean AK concn (mg kg−1) ± SD | Mean TN content (%) ± SD | Mean OC content (g kg−1) ± SD | Mean Fed content (g kg−1) ± SD | Mean EC (mS/cm) ± SD | Mean clay content (%) ± SD | Mean silt content (%) ± SD | Mean sand content (%) ± SD |
|---|---|---|---|---|---|---|---|---|---|---|---|
| S-N | 6.6 ± 0.2 C | 68.5 ± 8.8 C | 21.1 ± 8.3 C | 336.8 ± 49.0 B | 0.2 ± 0.0 C | 3.2 ± 0.4 C | 9.5 ± 0.8 C | 1.2 ± 0.2 B | 2.2 ± 0.5 C | 12.8 ± 3.3 C | 85.1 ± 3.8 A |
| S-M | 7.7 ± 0.1 B | 101.4 ± 7.1 B | 63.5 ± 4.8 B | 281.1 ± 46.2 A | 0.4 ± 0.04 B | 5.5 ± 0.5 B | 16.9 ± 0.9 B | 1.6 ± 0.2 A | 8.4 ± 0.2 B | 57.0 ± 2.1 B | 34.7 ± 2.2 B |
| S-F | 8.0 ± 0.1 A | 134.2 ± 9.8 A | 89.4 ± 14.2 A | 141.2 ± 40.2 A | 0.6 ± 0.1 A | 6.8 ± 0.6 A | 18.2 ± 0.7 A | 0.4 ± 0.1 C | 8.9 ± 0.2 A | 60.0 ± 0.7 A | 31.1 ± 0.5 C |
a
Values are means ± standard deviations (n = 5). Different letters within the same column denote significant differences (P < 0.05) between the sediments. AP, available phosphorus; AK, available potassium; TN, total nitrogen; OC, organic carbon; Fed, free Fe2O3; EC, electrical conductivity.
b
S-N, sampling transect located about 300 m away from the water-land junction, without vegetation; S-M, sampling transect located about 1,000 m away from the water-land junction, mainly covered with Scirpus mariqueter; S-F, sampling transect located about 2,500 m away from the water-land junction, mainly covered with Phragmites australis.