Table 3.
Physical and chemical properties in sediment samples.
| Unit (mg/L) | Mild | Moderate | Severe |
|---|---|---|---|
| B (—)b | 35.84 ± 3.91A | 29.32 ± 2.06A | 34.87 ± 1.57A |
| Cr (500) | 27.35 ± 1.89AB | 21.00 ± 1.37A | 30.80 ± 0.60B |
| Ni (100) | 22.31 ± 1.70AB | 18.66 ± 1.25A | 25.93 ± 0.91B |
| Cu (500) | 29.47 ± 3.90A | 96.75 ± 25.14A | 70.82 ± 6.97A |
| Zn (1200) | 86.79 ± 7.49A | 204.81 ± 25.96B | 213.70 ± 16.63B |
| As (30) | 7.04 ± 0.65A | 6.65 ± 1.02A | 9.39 ± 1.01A |
| Cd (3) | 0.37 ± 0.06A | 0.31 ± 0.02A | 0.24 ± 0.02A |
| Pb (300) | 19.62 ± 1.02A | 27.91 ± 7.98A | 33.77 ± 12.22A |
| Hg (3) | 2.74 ± 1.35A | 0.83 ± 0.16A | 0.82 ± 0.1A |
| TP | 812.44 ± 25.63A | 956.67 ± 69.7A | 751.33 ± 72.84A |
| TN | 1876.22 ± 73AB | 2163.83 ± 192.08B | 1415.67 ± 85.93A |
| NH3-N | 93.52 ± 4.14A | 100.30 ± 7.27A | 80.59 ± 2.81A |
| pH (5.5–8.5) | 7.93 ± 0.13A | 8.24 ± 0.1A | 8.01 ± 0.33A |
| OM (≥20) | 7522.67 ± 599.74AB | 13950.25 ± 2084.48B | 6273.00 ± 403.35A |
OM: Organic Matter. b: grade A of the Control Standards of Pollutants in sediment for Agricultural use (GB4284-2018). A and B indicate significant changes among three groups of ponds. The significance of difference was analyzed by using least significant difference (LSD).