Effects of urban circle and water management measures on spatial distribution pattern of inorganic nitrogen content in small water bodies: A case study of Changsha, Hunan Province

JIAO Junxia; SHI Jin; ZHOU Jiaogen; LEI Qiuliang

doi:10.13205/j.hjgc.202502002

Volume 43 Issue 2

Feb. 2025

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JIAO Junxia, SHI Jin, ZHOU Jiaogen, LEI Qiuliang. Effects of urban circle and water management measures on spatial distribution pattern of inorganic nitrogen content in small water bodies: A case study of Changsha, Hunan Province[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(2): 11-20. doi: 10.13205/j.hjgc.202502002

Citation:

JIAO Junxia, SHI Jin, ZHOU Jiaogen, LEI Qiuliang. Effects of urban circle and water management measures on spatial distribution pattern of inorganic nitrogen content in small water bodies: A case study of Changsha, Hunan Province[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(2): 11-20. doi: 10.13205/j.hjgc.202502002

Citation:

JIAO Junxia, SHI Jin, ZHOU Jiaogen, LEI Qiuliang. Effects of urban circle and water management measures on spatial distribution pattern of inorganic nitrogen content in small water bodies: A case study of Changsha, Hunan Province[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(2): 11-20. doi: 10.13205/j.hjgc.202502002

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Effects of urban circle and water management measures on spatial distribution pattern of inorganic nitrogen content in small water bodies: A case study of Changsha, Hunan Province

doi: 10.13205/j.hjgc.202502002

1. Zhengzhou University Environmental Technology and Consulting Limited Company, Zhengzhou 450002, China;
2. Hunan Institute of Water Resources and Hydropower Research, Changsha 410125, China;
3. Jiangsu Provincial Engineering Research Center for Intelligent Monitoring and Ecological Management of Pond and Reservoir Water Environment, Huaiyin Normal University, Huaian 223300, China;
4. Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture and Rural Affairs, China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China

Received Date: 2023-12-05
Accepted Date: 2024-04-20
Rev Recd Date: 2024-02-10

Abstract

Abstract

Understanding the spatial variation of inorganic nitrogen (DIN) and its driving factors in urban small water bodies is helpful for the scientific development of urban small water pollution prevention and control programs. Taking Changsha as the research area, DIN content in 68 small water bodies was randomly sampled and monitored, and spatial differentiation of NH₄⁺-N, NO₃^--N and DIN content and its influencing factors in small water bodies were discussed. Three circles were divided by their distance from the urban center as ＜5 km, 5 km to 10 km, and ＞10 km. The results showed that the DIN content of small water bodies in the study area had great variability (with a CV value up to 178.42%), and 7.35% were in NH₄⁺-N pollution state. The average NH₄⁺-N, NO₃^--N and DIN contents in small water bodies in the >10 km circle was higher than those in the <5 km, and 5 km to 10 km circles, which indicated that the NH₄⁺-N, NO₃^--N and DIN content of small water bodies increased with distance from the urban center. The average NH₄⁺-N and DIN content of small aquaculture water in the suburban area was higher than that of ecological protection, ecological restoration and ecological degradation in the urban center. Further analysis of hierarchical variance decomposition showed that the total contributions of the circle layer and water management mode to the variance variation of NH₄⁺-N, NO₃^--N and DIN were 59.5%, 49.2% and 68.5%, respectively, which further confirmed that the distance to the urban center and water management mode were the main factors affecting the variation of DIN component content in the study area. Moreover, the urban development trend and the implementation of water environment management measures were not coordinated, and small water bodies were possessing the risk of transferring from urban areas to suburban areas, and it was necessary to further strengthen the overall coordination and planning for risk control.
- ammonia nitrogen,
- nitrate nitrogen,
- inorganic nitrogen,
- small water body,
- distance from the urban center,
- water environment management

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References

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