Seasonal identification of phosphorus sources in typical urban lakes based on phosphate oxygen isotope technology

NING Junna; DENG Baisong; LI Mengze; WU Tianming; JIANG Xinrui; ZHANG Wen; DONG Siqi; HAN Zhenhua; FENG Li; DU Yao

doi:10.19509/j.cnki.dzkq.tb20250434

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NING Junna，DENG Baisong，LI Mengze，et al. Seasonal identification of phosphorus sources in typical urban lakes based on phosphate oxygen isotope technology[J]. Bulletin of Geological Science and Technology，2026，45（6）：1-10 doi: 10.19509/j.cnki.dzkq.tb20250434

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Seasonal identification of phosphorus sources in typical urban lakes based on phosphate oxygen isotope technology

doi: 10.19509/j.cnki.dzkq.tb20250434

NING Junna^{1, 2
,},
DENG Baisong³,
LI Mengze^{1, 2},
WU Tianming³,
JIANG Xinrui^{1, 2},
ZHANG Wen³,
DONG Siqi³,
HAN Zhenhua³,
FENG Li³,
DU Yao^{1, 2
,
,}

State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution, Wuhan 430078, China
MOE Key Laboratory of Groundwater Quality and Health, China University of Geosciences (Wuhan), Wuhan 430078, China
Yangtze Ecology and Environment Co., Ltd, Wuhan 430014, China

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Author Bio:
E-mail：ningjunna@cug.edu.cn
Corresponding author: E-mail：yaodu@cug.edu.cn
Received Date: 26 Sep 2025
Accepted Date: 18 Nov 2025
Rev Recd Date: 17 Nov 2025

Available Online: 22 Dec 2025

Abstract

Abstract

Objective
The source and concentration of phosphorus are key factors determining the occurrence of eutrophication in surface water. However, seasonal quantitative source apportionment of multi-source phosphorus remains a major technical bottleneck for urban compound-polluted lakes. Accurately identifying the seasonal contribution of different phosphorus pollution sources serves as an important basis for realizing differentiated phosphorus pollution control.
Methods
This study focused on Tangxun Lake (a typical urban lake) as the study area. It comprehensively adopted methods including field observation and phosphate oxygen isotope composition analysis, combined with the Bayesian MixSIAR isotope-mixing model for simulation, to quantitatively analyze phosphorus pollution sources in different seasons and their contribution to dissolved inorganic phosphorus (DIP) in lake water.
Results
The MixSIAR model calculation showed that during the wet season, urban stormwater sewage contributed the most to DIP in lake water, accounting for 35.8%, followed by domestic sewage (18.9%) and fish pond water (15.9%). During the dry season, the contribution of urban stormwater sewage to DIP in lake water was 30.7%, while that of domestic sewage was 21.4% and fishpond water was 18.7%. Overall, urban stormwater sewage had the highest contribution to DIP in lake water, but there were significant seasonal differences. These differences were mainly caused by the combined effects of higher summer precipitation and stronger microbial degradation. Several unknown phosphorus sources jointly formed a stable contribution system, ultimately resulting in no significant seasonal variation in the contribution of unknown sources to DIP in lake water.
Conclusion
This study clarifies the seasonal contribution characteristics of phosphorus sources in a typical urban lake with complex pollution, and points out that the identification of unknown phosphorus sources such as internal-source phosphorus and hidden point-source pollution still needs further improvement. It provides a scientific basis and technical reference for the accurate source apportionment and targeted control of phosphorus pollution in similar lakes.
- surface water,
- phosphorus source identification,
- phosphate oxygen isotope,
- seasonal variation,
- Tangxun Lake,
- MixSIAR model

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References(45)

References

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Seasonal identification of phosphorus sources in typical urban lakes based on phosphate oxygen isotope technology

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Seasonal identification of phosphorus sources in typical urban lakes based on phosphate oxygen isotope technology

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