REMOVAL PERFORMANCE OF NITROGEN AND PHOSPHORUS IN FARMLAND DRAINAGE BY DIFFERENT SCALE DRAINAGE DITCHES AND THE INFLUENCE FACTORS

GAO Yang; WANG Chao; WANG Peifang; CHEN Juan; YOU Guoxiang

doi:10.13205/j.hjgc.202305002

Volume 41 Issue 5

May 2023

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GAO Yang, WANG Chao, WANG Peifang, CHEN Juan, YOU Guoxiang. REMOVAL PERFORMANCE OF NITROGEN AND PHOSPHORUS IN FARMLAND DRAINAGE BY DIFFERENT SCALE DRAINAGE DITCHES AND THE INFLUENCE FACTORS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(5): 8-15. doi: 10.13205/j.hjgc.202305002

Citation:

GAO Yang, WANG Chao, WANG Peifang, CHEN Juan, YOU Guoxiang. REMOVAL PERFORMANCE OF NITROGEN AND PHOSPHORUS IN FARMLAND DRAINAGE BY DIFFERENT SCALE DRAINAGE DITCHES AND THE INFLUENCE FACTORS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(5): 8-15. doi: 10.13205/j.hjgc.202305002

Citation:

GAO Yang, WANG Chao, WANG Peifang, CHEN Juan, YOU Guoxiang. REMOVAL PERFORMANCE OF NITROGEN AND PHOSPHORUS IN FARMLAND DRAINAGE BY DIFFERENT SCALE DRAINAGE DITCHES AND THE INFLUENCE FACTORS[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(5): 8-15. doi: 10.13205/j.hjgc.202305002

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REMOVAL PERFORMANCE OF NITROGEN AND PHOSPHORUS IN FARMLAND DRAINAGE BY DIFFERENT SCALE DRAINAGE DITCHES AND THE INFLUENCE FACTORS

doi: 10.13205/j.hjgc.202305002

GAO Yang^1,2,
WANG Chao^1,2,3,
WANG Peifang^{1,2,3
,
,},
CHEN Juan^1,2,3,
YOU Guoxiang^1,2,3

1. College of Environment, Hohai University, Nanjing 210098, China;
2. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China;
3. Research Center of Pollution Control and Treatment Project Technology on Agricultural and Rural, Jiangsu Province, Nanjing 210098, China

Received Date: 2022-01-11

Abstract

Abstract

Aiming at the typical farmland drainage system (multilevel field-sublateral-head-branch-trunk ditch) in the large and medium-sized irrigation districts of China, this paper selected the rice field of Xinhai Farm in Chongming Island of Shanghai as a starting point, which the one-way analysis of variance and principal coordinate analysis were used to evaluate the drainage water quality of farmland. In order to study the temporal and spatial variation characteristics of nitrogen and phosphorus pollutants in drainage ditches of different scales, and reveal the removal rules of nitrogen and phosphorus pollutants in the step-by-step drainage system. Combined with Spearman correlation analysis, the main factors affecting the removal efficiency of nitrogen and phosphorus in drainage ditches of different scales were identified. Results indicated that ammonia nitrogen, nitrate nitrogen, nitrite nitrogen, available phosphorus and particulate phosphorus in farmland drainage ditches of different scales showed the same change law as total nitrogen and total phosphorus during the whole growing period of rice, that is, the rice seeding period (June) and tillering period (July) had higher concentrations, while the filling maturity period (October) had the lowest concentration, and the heading and flowering period (August) fluctuated greatly. Multilevel field-sublateral-head-branch-trunk ditch can remove 13.30%, 39.24%, 11.23%, 5.27%, 8.86% of total nitrogen and 13.20%, 36.57%, 9.10%, 13.18%, 11.07% of total phosphorus, respectively. The scale effect of farmland drainage ditches was the main reason for the changes in the physical and chemical properties of water bodies, which in turn led to the differences in nitrogen and phosphorus removal efficiency. The unique size structure and environmental characteristics of sublateral ditches made it a hot point for reducing nitrogen and phosphorus, so the ecological renovation of sublateral ditches should be strengthened in construction of ecological drainage ditches in the future.
- scale effect,
- farmland drainage,
- ecological ditches,
- nitrogen and phosphorus,
- gradual purification

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References(26)

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