藻源异味污染广泛存在于世界各地水体，严重影响水质和水体的景观价值。为研究城市景观水体月湖的藻源异味污染时空变化、来源及驱动因子，于2021年3月至2022年2月进行了为期1 a的逐月采样，分析了水中4种主要藻源异味物质2-甲基异莰醇，土臭素，β-环柠檬醛和β-紫罗兰酮的胞外浓度，以及水质指标和藻类组成，采用spearman相关性分析、冗余分析和偏最小二乘结构方程模型（PLS-SEM）对异味来源和驱动因子进行了研究。结果表明，月湖近岸区域受藻源异味物质2-甲基异莰醇和土臭素污染较严重，年平均浓度高达35.04和8.58 ng/L。高浓度污染主要出现在6~9月。2-甲基异莰醇可能主要来自Oscillatoria、Pseudanabaena和Anabaena; 土臭素可能来自Anabaena、Aphanizomenon、Pseudanabaena和Oscillatoria；而β-环柠檬醛和β-紫罗兰酮并非主要来自藻类。PLS-SEM结果表明，气象条件（辐射和蒸发）是月湖藻源异味的主要驱动力，而养分（总氮和总磷）的影响相对较弱。气象条件除了对藻类有显著的直接影响外，还对养分和藻类之间的关系有显著的正向调节作用，但对藻类和异味物质之间的关系没有调节作用。这些结果表明，气象条件主要是通过影响藻类的生长，而非直接影响异味的生成来驱动异味污染。

Algal-derived off-flavors (ADOFs) pollution is a global issue that severely impacts water quality and the aesthetic value of water bodies. To investigate the temporal and spatial changes、sources and driving factors of this pollution in Lake Yuehu, a city landscape lake, we carried out one year-long study from March 2021 to February 2022. Monthly sampling was performed, and the concentrations of four major extracellular off-flavors (2-methylisoborneol (2-MIB), geosmin (GSM),β-cyclocitral and β-ionone), as well as water quality indicators and algal composition were analyzed. Using Spearman's correlation analysis, redundancy analysis, and partial least squares structural equation modeling (PLS-SEM), we examined the sources and drivers of off-flavors. Our results indicated that the nearshore area of Lake Yuehu was heavily polluted by 2-MIB and GSM, with annual average concentrations as high as 35.04 ng/L and 8.58 ng/L, respectively. High concentration pollution mainly occurred from June to September. The 2-MIB likely originated mainly from Oscillatoria, Pseudanabaena, and Anabaena, while GSM was potentially derived from Anabaena, Aphanizomenon, Pseudanabaena, and Oscillatoria. β-cyclocitral and β-ionone did not appear to be primarily algal in origin. PLS-SEM results revealed that meteorological conditions (radiation and evaporation) served as the principal drivers of off-flavors in Lake Yuehu, while nutrient levels (total nitrogen and total phosphorus) had relatively weak impacts. Meteorological conditions not only had a significant direct influence on algal growth, but also significantly positively moderated the relationship between nutrients and algae. However, they did not moderate the relationship between algae and off-flavors. These findings implied that meteorological conditions mainly induced off-flavors via influencing algal growth, rather than directly affecting the production of off-flavors.