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| Effects of flow rate on phosphorus absorption in ditches |
| Received:March 14, 2024 |
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| KeyWord:non-point source pollution;phosphorus;simulated ditches;consumption along the way;flow velocity |
| Author Name | Affiliation | E-mail | | TONG Deli | College of Life Science, Shenyang Normal University, Shenyang 110034, China | | | LI Mengqi | College of Life Science, Shenyang Normal University, Shenyang 110034, China
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | WANG Haixiang | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | CHEN Hao | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | XIA Yongqiu | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | WANG Shenqiang | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | WANG Yu | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | wangyu@issas.ac.cn |
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| Abstract: |
| To explore the process of phosphorus absorption in ditches in agricultural emissions, a ditch simulation system was used to investigate the phosphorus depletion process and influencing factors in water bodies at different flow rates（0, 1, 3, 6 cm·s-1, and 10 cm·s-1）. Thus, four different treatments were evaluated：S-0.2（no plant, initial P concentration of 0.2 mg ·L-1）, S-0.5（no plant, initial P concentration of 0.5 mg ·L-1）, S + I. - 0.2（Iris tectorum, initial P concentration of 0.2 mg ·L-1）, and S + I. - 0.5（Iris tectorum, initial P concentration of 0.5 mg·L-1）. The results showed that the total phosphorus（TP）dissipation rates of all four treatments decreased as the flow velocity increased. The water TP dissipation rates decreased from 24.1, 63.5, 37.5 μmol·m-2·h-1, and 72.9 μmol·m-2·h-1 at a flow velocity of 0 to 5.01, 3.92, 5.06 μmol·m-2·h-1, and 12.1 μmol·m-2·h-1, respectively（flow velocity of 10 cm·s-1）. High flow velocities disturbed the water-sediment and increased the concentration of particulate P（PP）in the water column, which decreased to 0.005, 0.006, 0.005 mg·L-1, and 0.009 mg·L-1 in the water column at 24 h of quiescence. By contrast, PP increased to 0.04, 0.08, 0.03 mg·L-1, and 0.06 mg·L-1 in the water column at flow velocities of 10 cm·s-1. In addition, at the same initial P concentrations, the planting aquatic iris was found to increase the average TP elimination rate of the water body by 17% - 34% and absorb more soluble inorganic P. These results indicate that low flow rates favored P deposition and adsorption, while increased flow rates promoted substrate disturbance, leading to the release of more PP and lowering the rate of TP elimination from the water body. In addition, planting was also found to contribute to P depletion in ditches. |
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