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王愿珠, 张春梅, 毕永红, 朱宇轩, 宋高飞, 王树磊, 梁建奎, 米武娟. 南水北调中线干渠异味物质时空动态及其影响因素[J]. 水生生物学报, 2022, 46(2): 149-159. DOI: 10.7541/2022.2020.206
引用本文: 王愿珠, 张春梅, 毕永红, 朱宇轩, 宋高飞, 王树磊, 梁建奎, 米武娟. 南水北调中线干渠异味物质时空动态及其影响因素[J]. 水生生物学报, 2022, 46(2): 149-159. DOI: 10.7541/2022.2020.206
WANG Yuan-Zhu, ZHANG Chun-Mei, BI Yong-Hong, ZHU Yu-Xuan, SONG Gao-Fei, WANG Shu-Lei, LIANG Jian-Kui, MI Wu-Juan. SPATIO-TEMPORAL PATTERN OF ODOROUS COMPOUNDS AND ITS INFLUENCING FACTORS IN THE CANAL OF THE MIDLE-ROUTE OF SOUTH-TO-NORTH WATER DIVERSION PROJECT[J]. ACTA HYDROBIOLOGICA SINICA, 2022, 46(2): 149-159. DOI: 10.7541/2022.2020.206
Citation: WANG Yuan-Zhu, ZHANG Chun-Mei, BI Yong-Hong, ZHU Yu-Xuan, SONG Gao-Fei, WANG Shu-Lei, LIANG Jian-Kui, MI Wu-Juan. SPATIO-TEMPORAL PATTERN OF ODOROUS COMPOUNDS AND ITS INFLUENCING FACTORS IN THE CANAL OF THE MIDLE-ROUTE OF SOUTH-TO-NORTH WATER DIVERSION PROJECT[J]. ACTA HYDROBIOLOGICA SINICA, 2022, 46(2): 149-159. DOI: 10.7541/2022.2020.206

南水北调中线干渠异味物质时空动态及其影响因素

SPATIO-TEMPORAL PATTERN OF ODOROUS COMPOUNDS AND ITS INFLUENCING FACTORS IN THE CANAL OF THE MIDLE-ROUTE OF SOUTH-TO-NORTH WATER DIVERSION PROJECT

  • 摘要: 为认识南水北调中线干渠异味物质的时空动态, 于2018年9月至2019年8月对干渠沿线9个样点开展了6种异味物质、藻类群落及理化因子的逐月同步调查; 结果显示: 二甲基异莰醇含量平均值为(7.431±9.631) ng/L, 夏季略超出嗅阈值; β-环柠檬醛和β-紫罗兰酮平均值分别为(12.371±12.800)和(11.973±20.643) ng/L, β-紫罗兰酮含量在秋季超标; 二甲基三硫醚平均值为(173.014±302.047) ng/L, 冬季和春季未检出; 土臭素和甲硫醚含量全年全程未超出嗅阈值; 6种异味物质的季节差异大于空间差异(P<0.05)。RDA冗余分析表明, CODMn与甲硫醚和二甲基三硫醚呈显著负相关关系(P<0.05); β-环柠檬醛、β-紫罗兰酮、二甲基三硫醚、二甲基异莰醇与硝态氮显著相关(P<0.05), 叶绿素a与β-环柠檬醛和β-紫罗兰酮呈显著正相关关系(P<0.05), 硝态氮、CODMn和叶绿素a是预测异味物质动态变化的关键环境因子。土臭素和二甲基异莰醇与金藻和假鱼腥藻呈显著正相关关系, 微囊藻对β-紫罗兰酮含量具有13.8%的解释权重, 甲硫醚和二甲基三硫醚与甲藻细胞密度和藻类总细胞密度具有相关关系。研究结果表明, 南水北调中线干渠的异味问题总体上尚不严重, 藻类是该水体异味物质的重要贡献者, 为防止水质异味问题, 需要特别关注夏秋季藻类群落组成及其动态变化。

     

    Abstract: In order to recognize the spatiotemporal dynamics of odorous compounds in nine sampling sites along the main canal of the Middle Route of South-to-North Water Diversion Project, we monitored six odorous compounds, phytoplankton communities, physicochemical parameters every month, from September 2018 to August 2019. Results showed that the average concentration of 2-methylisoborneol was (7.431±9.631) ng/L, which exceeded the olfactory threshold in summer. The mean concentrations of β-cyclocitral and β-ionone were (12.371±12.800) ng/L and (11.973±20.643) ng/L, respectively, and β-ionone exceeded its olfactory threshold in autumn. The average concentration of dimethyl-trisulfide was (173.014±302.047) ng/L, which was not detected in winter and spring. Geosmin and dimethyl-sulfide did not surpass the olfactory threshold in the whole year along the MRP. The seasonal variance of six odorous compounds were greater than the spatial difference in MRP. Redundancy analysis showed that CODMn had a significant negative relationship with dimethyl-sulfide and dimethyl-trisulfide. β-Cyclocitral, β-ionone, dimethyl-sulfide and dimethyl-trisulfide were significantly correlated with nitrate, and Chl.a had a remarkable positive relationship with β-cyclocitral and β-ionone. Nitrate, CODMn and Chl.a were the influencing factors to predict the dynamic change of odorous compounds. There was a significant positive correlation between the concentration of 2-methylisoborneol and geosmin with Chrysophyta sp. and Anabaena pseudoanabaena. There was a time overlapping between the cell density of Microcystis sp. and the concentration of β-cyclocitral and β-ionone. Microcystis sp. had 13.8% explanatory weight to the concentration of β-ionone. There was a correlation between dimethyl-sulfide and dimethyl-trisulfide with Pyrrophyta sp. and total cells density. These findings reveal that the odourous problem in the main canal of MRP is generally not serious, but algae is an important contributor to the odorous compounds. In order to prevent the odorous problem, it is necessary to pay attention to the algae community composition and its dynamic variations in summer and autumn.

     

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