基于磷酸盐氧同位素的典型城市湖泊水体磷来源季节性识别

宁君娜; 邓柏松; 李梦泽; 吴天明; 蒋欣芮; 张文; 董思奇; 韩振华; 丰莉; 杜尧

doi:10.19509/j.cnki.dzkq.tb20250434

基于磷酸盐氧同位素的典型城市湖泊水体磷来源季节性识别

doi: 10.19509/j.cnki.dzkq.tb20250434

宁君娜^{1, 2,},
邓柏松³,
李梦泽^{1, 2},
吴天明³,
蒋欣芮^{1, 2},
张文³,
董思奇³,
韩振华³,
丰莉³,
杜尧^{1, 2, ,}

国家环境保护水污染溯源与管控重点实验室，武汉 430078
中国地质大学（武汉）地下水质与健康教育部重点实验室，武汉 430078
长江生态环保集团有限公司，武汉 430014

基金项目: 中国长江三峡集团有限公司科研项目（202303211）；国家环境保护水污染溯源与管控重点实验室科研项目

详细信息

作者简介:
宁君娜：E-mail：ningjunna@cug.edu.cn

通讯作者:
E-mail：yaodu@cug.edu.cn

计量
- 文章访问数: 306
- PDF下载量: 35
- 被引次数: 0
出版历程
- 收稿日期: 2025-09-26
- 录用日期: 2025-11-18
- 修回日期: 2025-11-17
- 网络出版日期: 2025-12-22

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

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

More Information

Author Bio:
E-mail：ningjunna@cug.edu.cn

Corresponding author: E-mail：yaodu@cug.edu.cn

摘要

摘要:
磷的来源及含量是决定地表水体富营养化发生的关键因素，城市复合污染湖泊多源磷的季节性定量溯源仍是技术难点，精准识别不同季节磷污染源的贡献占比，是实现磷污染差异化管控的重要基础。本研究以典型城市湖泊汤逊湖为研究区，综合采用野外观测、磷酸盐氧同位素组成分析，结合贝叶斯 MixSIAR 同位素混合模型模拟方法，定量解析不同季节磷污染来源及其对湖水溶解性无机磷（DIP）的贡献比例。MixSIAR 模型计算表明，丰水期城市雨洪污水对湖水 DIP 贡献最大，占比为 35.8%，其次是生活污水（18.9%）和鱼塘水（15.9%）；枯水期城市雨洪污水对湖水 DIP 贡献量为 30.7%，生活污水为 21.4%，鱼塘水为 18.7%。整体来看，城市雨洪污水对湖水 DIP 的贡献占比最大，但存在显著季节性差异，该差异主要由夏季降水偏多耦合较强的微生物降解作用共同导致。若干未知磷源共同构成了稳定贡献体系，最终导致未知来源对湖水 DIP 的贡献未表现出明显的季节性差异。本研究明确了典型复合污染城市湖泊水体磷来源的季节性贡献特征，同时指出内源、隐性点源等未知磷源的识别仍有待深化，为同类型湖泊的磷污染精准溯源与针对性管控提供了科学依据和技术借鉴。
- 地表水 /
- 磷溯源 /
- 磷酸盐氧同位素 /
- 季节性变化 /
- 汤逊湖 /
- MixSIAR 模型
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

HTML全文

图 1 汤逊湖采样点分布图

Figure 1. Distribution of sampling points in Tangxun Lake

下载: 全尺寸图片幻灯片

图 2 丰、枯水期汤逊湖湖水总溶解磷（TDP）(a)、溶解无机磷（DIP）(b)质量浓度以及DIP/TDP (c)（IQR. 四分位距；下同）

Figure 2. Concentrations of total dissolved phosphorus (TDP) (a), dissolved inorganic phosphorus (DIP) (b), and DIP/TDP ratios (c) of Tangxun Lake during wet and dry seasons

下载: 全尺寸图片幻灯片

图 3 丰、枯水期汤逊湖湖水实测δ¹⁸O_P值(a)和实测δ¹⁸O_P值与预期平衡Eδ¹⁸O_P值的偏差(b)

Figure 3. Measured δ¹⁸O_P values (a) and deviation of measured δ¹⁸O_P values from expected equilibrium Eδ¹⁸O_P values (b) in Tangxun Lake during wet and dry seasons

下载: 全尺寸图片幻灯片

图 4 丰、枯水期不同污染源对汤逊湖湖水溶解无机磷（DIP）的贡献度

Figure 4. Contribution of different pollution sources to dissolved inorganic phosphorus (DIP) in Tangxun Lake during wet and dry seasons

下载: 全尺寸图片幻灯片

图 5 丰、枯水期湖水溶解无机磷（简称DIP）与溶解无机碳中稳定碳同位素（δ¹³C-DIC）关系（r. 皮尔逊相关系数；P. 显著性水平）

Figure 5. Relationship between dissolved inorganic phosphorus (DIP) and stable carbon isotope (δ¹³C-DIC) in dissolved inorganic carbon in lake water during wet and dry seasons

下载: 全尺寸图片幻灯片

图 6 丰、枯水期汤逊湖湖水溶解性有机碳（DOC）质量浓度(a)、荧光指数（FI）(b)、腐殖化指数（HIX）(c)、新鲜度指数（BIX）(d)对比

Figure 6. Comparison of dissolved organic carbon (DOC) concentration (a), fluorescence index (FI) (b), humification index (HIX) (c), and freshness index (BIX) (d) of Tangxun Lake during wet and dry seasons

下载: 全尺寸图片幻灯片

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