Study on the stability of interception effect of ecological ditches on nutrient elements such as nitrogen and phosphorus in farmland drainage

doi:10.16178/j.issn.0528-9017.20240466

Abstract

Abstract:

Nutrient elements such as nitrogen and phosphorus in farmland drainage will lead to eutrophication of natural water bodies and seriously threaten the health of water environment. As the terminal treatment system of farmland drainage, ecological ditch is the key to control the transfer of nutrients such as nitrogen and phosphorus in farmland to the natural environment, but the research on the stability of its interception effect is relatively few. This study monitored the interception effect of nutrient elements such as nitrogen and phosphorus in two ecological ditches in Jinhua City, and continuously evaluated the water quality grades at different points from September to October in 2022 to 2023. The results show that Jinhua ecological ditch can continuously reduce the concentrations of ammonia nitrogen, total nitrogen, total phosphorus and chemical oxygen demand in farmland drainage, and maintain effective and stable interception of nutrients such as nitrogen and phosphorus. And the interception effect in 2022 is significantly better than that in 2023, in which the constructed soil microbial plant system and the normally operating purification facilities have made important contributions to the adsorption and interception of nitrogen and phosphorus and other nutrients. Finally, the above-mentioned ecological ditches can improve the water quality standard of farmland drainage by 1-2 grades, and basically maintain the concentration of ammonia nitrogen, total nitrogen, total phosphorus and chemical oxygen demand in the downstream water body at class Ⅰ-Ⅲ water standards. In conclusion, Jinhua ecological ditches can effectively and stably intercept nutrients such as nitrogen and phosphorus in farmland drainage, but the relevant potential influencing factors still need to be further studied.

Key words: ecological ditch, farmland drainage, interception effects, stability

CLC Number:

GE Jiaying, SHAO Jianjun, ZHUANG Haifeng, LI Jiwei, LU Yi, GAO Hongbei, SHAN Shengdao. Study on the stability of interception effect of ecological ditches on nutrient elements such as nitrogen and phosphorus in farmland drainage[J]. Journal of Zhejiang Agricultural Sciences, 2025, 66(9): 2264-2270.

Figures/Tables 5

Table 1 Environmental quality standard for surface water (GB 3838—2002) 单位:mg·L-1

序号	项目	Ⅰ类	Ⅱ类	Ⅲ类	Ⅳ类	Ⅴ类
1	化学需氧量	≤15	≤15	≤20	≤30	≤40
2	氨氮	≤0.15	≤0.5	≤1.0	≤1.5	≤2.0
3	总氮	≤0.2	≤0.5	≤1.0	≤1.5	≤2.0
4	总磷	≤0.02	≤0.1	≤0.2	≤0.3	≤0.4

Fig.1 Interception efficiency of ecological ditches for nutrient elements such as nitrogen and phosphorus in farmland drainage in Jinhua City from 2022 to 2023

Fig.2 Comparison of water quality at different points of ecological ditches in Jinhua City from 2022 to 2023

Fig.3 Water quality monitoring results of ecological ditches in Jinhua City in September and October in 2022

Fig.4 Water quality monitoring results of ecological ditches in Jinhua City in September and October in 2023

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