湖泊科学2026，Vol.38Issue(1)：78-90,13.DOI:10.18307/2026.0111
长江流域典型水源水库春季2-甲基异莰醇浓度及其影响因素
Occurrence of 2-methylisoborneol in typical drinking-water source reservoirs located in Changjiang River catchment in spring
摘要
Abstract
There is a very high risk of odorous compounds contaminating drinking water sources in the Changjiang River catchment in spring.However,the key drivers for the occurrence of odorous compounds are still unclear.In May 2024,nine drinking water source reservoirs across the upper,middle and lower reaches of the Changjiang River were investigated.Four odorous compounds,2-methylisoborneol(2-MIB),geosmin(GSM),β-cyclocitral(CYC)and β-ionone(ION)and their associated environmental factors were surveyed.The results showed that 2-MIB was the most common odorous compound in the research region,with an av-erage concentration of 35.5 ng/L across the 32 samples from 9 reservoirs(59.4％exceeding the drinking water standard of 10.0 ng/L).GSM posed a lower risk,with an average concentration of 2.9 ng/L and only 12.5％exceeding the threshold value of 10 ng/L.CYC(averaged at 18.2 ng/L)and ION(averaged at 7.2 ng/L)exhibited minimal odorous concerns.Pseudanabaena sp.was identified as a likely major producer of 2-MIB,with its cell density showing a significant positive correlation with the concentra-tion of 2-MIB.However,the presence of 2-MIB in two reservoirs without detectable Pseudanabaena,indicated more complex 2-MIB sources in some reservoirs.2-MIB levels positively correlated with the trophic state index,demonstrating that eutrophication directly promotes 2-MIB production.The 7-day accumulated rainfall amount before sampling was negatively correlated with the 2-MIB concentration,suggesting that short-term heavy rainfall processes will strongly change the odor compounds risk in reservoirs.Despite most drinking water source reservoirs in this region were under mesotrophic conditions,while it showed widespread 2-MIB exceedances.It is vital to reduce external nutrient loads and optimize aquatic food webs to prevent odorous issues and ensure drink-ing safety.关键词
长江流域/水源水库/中营养/2-甲基异莰醇/假鱼腥藻Key words
Changjiang River catchment/drinking water source reservoir/mesotrophic/2-methylisoborneol/Pseudanabaena引用本文复制引用
Wei Yanzhang,Zhu Guangwei,Chi Yi,Huang Changchun,Xiao Man..长江流域典型水源水库春季2-甲基异莰醇浓度及其影响因素[J].湖泊科学,2026,38(1):78-90,13.基金项目
国家自然科学基金项目(42271080,U2340209)和中国科学院南京地理与湖泊研究所自主部署科研项目(NIGLAS2022GS03)联合资助. （42271080,U2340209）
