太湖贡湖湾2023年夏季藻情变化及嗅味物质研究

王晓宇; 朱杰; 俞彦青; 徐一帆; 李祎飞; 谢忱; 范子武; 李丹丹

doi:10.13205/j.hjgc.202502012

太湖贡湖湾2023年夏季藻情变化及嗅味物质研究

doi: 10.13205/j.hjgc.202502012

王晓宇^1,3,
朱杰²,
俞彦青⁴,
徐一帆⁴,
李祎飞²,
谢忱^1,3,
范子武^1,3,,
李丹丹^1,3,

1. 南京水利科学研究院, 江苏南京 210029;
2. 江南大学环境与生态学院, 江苏无锡 214122;
3. 水利部太湖流域水治理重点实验室, 江苏无锡 214131;
4. 无锡德林海环保科技股份有限公司, 江苏无锡 214000

基金项目:

国家重点研发计划课题(2022YFC3202604)

中央级公益性科研院所基本科研业务费专项(Y123002、Y123001、Y121008)

水利部太湖流域水治理重点实验室开放基金(YK922001-C6)

江苏省水利科技项目(2022072)

详细信息

作者简介:
王晓宇(1992-),女,博士,工程师,主要研究方向为河湖治理、环境功能材料研发、智慧水利。wangxiaoyu@nhri.cn

通讯作者:
范子武(1970-),男,博士,正高级工程师,主要从事智慧水利、城市水力学、城市水环境提升和洪水风险管理等研究。zwfan@nhri.cn
李丹丹(1993-),女,博士,工程师,研究方向为新型有机污染物的生态风险与致毒机制研究。lidd@nhri.cn

范子武(1970-),男,博士,正高级工程师,主要从事智慧水利、城市水力学、城市水环境提升和洪水风险管理等研究。zwfan@nhri.cn
李丹丹(1993-),女,博士,工程师,研究方向为新型有机污染物的生态风险与致毒机制研究。lidd@nhri.cn

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出版历程
- 收稿日期: 2024-07-07
- 录用日期: 2024-09-25
- 修回日期: 2024-09-04

Investigating algal blooms and associated odors in Gonghu Bay, Taihu Lake during the summer of 2023

WANG Xiaoyu^1,3,
ZHU Jie²,
YU Yanqing⁴,
XU Yifan⁴,
LI Yifei²,
XIE Chen^1,3,
FAN Ziwu^{1,3
,},
LI Dandan^{1,3
,}

1. Nanjing Hydraulic Research Institute, Nanjing 210029, China;
2. College of Environment and Ecology, Jiangnan University, Wuxi 214122, China;
3. Key Laboratory of Taihu Basin Water Resources Management, Ministry of Water Resources, Wuxi 214131, China;
4. Wuxi Delinhai Environmental Technology Co., Ltd., Wuxi 214000, China

摘要

摘要: 太湖作为重要的水源地,其蓝藻水华问题多年来一直备受关注,蓝藻代谢所产生的嗅味物质也越来越受到重视。为探究太湖水体中的藻类变化以及藻生嗅味物质情况,本研究选取贡湖湾为研究区域,评估其2023年夏季水质指数(WQI)和水质综合营养状态指数(TLI),监测藻类密度和群落组成,以及水体中二甲基三硫(DMTS)、2-甲基异莰醇(2-MIB)、柠檬醛(CIT)、2,4,6-三氯苯甲醚(TCA)、土臭素(GSM)、以及β-紫罗兰酮(BI)6种嗅味物质浓度。研究结果表明, 2023年夏季,贡湖湾的水质在6月和7月较好,8月总氮与氨氮浓度相对较高,8月WQI和TLI分别为70.1±5.0和58.1±4.1;贡湖湾水体中藻类的平均密度(1.27×10⁷个/L)相较于往年大幅下降,蓝藻门依旧占据主导地位,其中丝状蓝藻的占比明显升高,假鱼腥藻属成为优势藻属;本研究在贡湖湾水体中共监测到2-MIB、CIT、TCA和BI四种嗅味物质,这些嗅味物质在 6月和7月的浓度较低,但在8月的总浓度达到(556.3±64.6) ng/L,嗅味问题依然需要引起重视;基于相关性分析发现假鱼腥藻属和隐球藻属是产生TCA的潜在来源,其中隐球藻属可能也是产生BI的来源之一,这些产嗅藻属与水体中的总氮显著正相关;嗅味物质在6月和7月的风险熵值(RQ)皆低于0.1,为低生态风险,但在8月由于TCA的浓度较高导致呈现中等生态风险(RQ=0.86),建议对水体中的TCA及其相关藻类采取有效的监测和防治措施。
- 太湖 /
- 贡湖湾 /
- 水质评价 /
- 蓝藻 /
- 嗅味物质
Abstract: Taihu Lake’s blue-green algae blooms have been a persistent environmental issue, with the associated odors becoming increasingly concerning, due to their impact on water quality and ecological health. The blooms are influenced by a complex interplay of factors including nutrient input, water temperature, and alterations in the food chain, which underscores the complexity of managing these ecosystems. Furthermore, the odors produced during algae metabolism not only affect the aesthetic quality of the water but also pose potential health risks, highlighting the urgency of addressing the algal blooms and their metabolic byproducts. The ecological risk management of Taihu Lake requires a comprehensive approach that considers the biological and chemical aspects of the blooms, as well as the potential impacts on human health and the environment. The Gonghu Bay, a hotspot for algal blooms in the past, was selected as the study area for investigating changes in algae and algogenic odors in Taihu Lake during the summer of 2023. The collected water samples provide crucial data on the current state of algal populations and the associated odors, helping to understand the ecological health of the lake. In-situ and laboratory works were conducted to analyze the water samples, including evaluating the water quality index (WQI) and trophic level index (TLI), monitoring the algal density and community composition, and determining the concentrations of six odors. The WQI and TLI are critical tools for assessing the overall health and trophic state of the water body, providing a comprehensive understanding of water quality parameters and nutrient levels that can influence algal growth. The target odors were dimethyl trisulfide (DMTS), 2-methylisoborneol (2-MIB), citral (CIT), 2,4,6-trichlorotoluene (TCA), geosmin (GSM), and β-ionone (BI). The results showed that the water quality in Gonghu Bay during the summer of 2023 was relatively better in June and July, but became deteriorated in August. The values of WQI and TLI in August were 70.1±5.0 and 58.1±4.1, respectively, which could be attributed to the higher concentrations of TN and NH4+-N. The average algal density (1.27×10⁷ cells/L) was significantly lower than those in previous years. Cyanophyta was still the primary algae at the phylum level, but the proportion of filamentous cyanobacteria increased significantly and the genus Pseudanabaena was the dominant one. A total of four odors (2-MIB, CIT, TCA, and BI) were detected in the surface water of Gonghu Bay and their concentrations were low in June and July. However, the total concentrations of these odors in August could be up to (556.3±64.6) ng/L, implying that odors in Taihu Lake still require attention. Based on the correlation analysis, the genera Pseudanabaena and Aphanocapsa were identified as the potential sources of TCA, in which the genus Aphanocapsa was also thought of as one of the sources of BI. These odor-producing algal genera were significantly positively correlated with TN in water. The risk quotients (RQ) of odors were below 0.1 in June and July, indicating low ecological risk, but the ecological risk was moderate (RQ=0.86) in August, likely due to the high concentration of TCA. Therefore, it is necessary to carry out effective monitoring and preventive measures for the TCA and its related algae in Taihu Lake.
- Taihu Lake /
- Bonghu Bay /
- water quality assessment /
- blue-green algae /
- odors

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参考文献(30)

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