农业环境科学学报2025，Vol.44Issue(1)：117-125,9.DOI:10.11654/jaes.2024-0228
流速对沟渠磷消纳的影响
Effects of flow rate on phosphorus absorption in ditches
摘要
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.关键词
面源污染/磷/沿程消纳/模拟沟渠/流速Key words
non-point source pollution/phosphorus/simulated ditches/consumption along the way/flow velocity分类
资源环境引用本文复制引用
佟德利,李梦琦,王海翔,陈浩,夏永秋,王慎强,汪玉..流速对沟渠磷消纳的影响[J].农业环境科学学报,2025,44(1):117-125,9.基金项目
国家重点研发计划项目(2021YFD1700802) （2021YFD1700802）
国家自然科学基金项目(42277026) （42277026）
长江生态环境保护修复联合研究二期项目(2022-LHYJ-02-0502-05) National Key Research and Development Program of China(2021YFD1700802) （2022-LHYJ-02-0502-05）
National Natural Science Foundation of China(42277026) （42277026）
Yangtze River Ecological Environment Protection and Restoration Project Ⅱ(2022-LHYJ-02-0502-05) （2022-LHYJ-02-0502-05）
