| 北方富营养分层型水库藻类季节性暴发机制及其阈值分析 |
| 摘要点击 2725 全文点击 1024 投稿时间：2022-05-02 修订日期：2022-05-30 |
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| 中文关键词 水源水库 富营养 分层 藻类水华 暴发机制 环境阈值 |
| 英文关键词 drinking water reservoir eutrophication stratification algal blooms blooming mechanism environmental thresholds |
| 作者 | 单位 | E-mail | | 温成成 | 西安建筑科技大学环境与市政工程学院, 西北水资源与环境生态教育部重点实验室, 西安 710055
西安建筑科技大学环境与市政工程学院, 陕西省环境工程重点实验室, 西安 710055 | hitchengchengwen@163.com | | 黄廷林 | 西安建筑科技大学环境与市政工程学院, 西北水资源与环境生态教育部重点实验室, 西安 710055
西安建筑科技大学环境与市政工程学院, 陕西省环境工程重点实验室, 西安 710055 | huangtinglin@xauat.edu.cn | | 孔昌昊 | 西安建筑科技大学环境与市政工程学院, 西北水资源与环境生态教育部重点实验室, 西安 710055
西安建筑科技大学环境与市政工程学院, 陕西省环境工程重点实验室, 西安 710055 | | | 张志刚 | 李家河水库管理有限公司, 西安 710016 | | | 田鹏飞 | 李家河水库管理有限公司, 西安 710016 | |
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| 中文摘要 |
| 季节性藻类水华严重威胁供水安全，为探明北方富营养分层型水库藻类季节性暴发机制，以李家河水库为例，于2017~2020年开展长期连续高频监测，采用传统藻群和功能藻群分类法，并耦合局部加权回归法和边界分析模型，提炼藻华季节性（春季和夏季）演替规律及暴发环境因子阈值.结果表明：①春季和夏季藻华演替规律及响应机制不同，春季以绿藻、硅藻和甲藻为主，而夏季以绿藻、硅藻和蓝藻为主；其中，春季以低温、小型且高比表面积藻为主，而夏季以高温、大型或团状且低比表面积藻为主；藻类生理和形态特征差异是造成季节性藻华的主要内因；②春季和夏季藻华主要驱动因子不同，春季藻华主要为水温、混合层深度（Zmix）和光利用率（Zeu/Zmix）控制，而夏季藻华主要受水温、Zmix、Zeu/Zmix和总磷（TP）的共同影响；主驱动因子的变化差异是诱发季节性藻华的主要外因；③春季和夏季藻华暴发的水环境阈值不同，春季藻类暴发的水温、Zmix和Zeu/Zmix阈值分别为>9.4℃、<10.9 m和>0.24；而夏季藻华启动的水温、Zmix、Zeu/Zmix和TP阈值分别为>16.0℃、<11.6 m、>0.16和>0.011 mg ·L-1.通过丰富藻华季节性暴发和环境阈值机制研究，为下一步藻华控制提供了依据. |
| 英文摘要 |
| Seasonal algal blooms produce a high risk for water supply safety. To explore the mechanism of seasonal algal blooms in northern eutrophic stratified reservoirs, the combination of taxonomic and functional classifications, local weighted regression (LOWESS), and Boundary line analysis (BLA) were employed to obtain the succession features and environmental thresholds of seasonal (e.g., spring and summer) algal blooms, based on the long-term and high-frequency monitoring from 2017 to 2020 in Lijiahe Reservoir. The results showed that:① the succession and response mechanisms of algal blooms were different in spring and summer. In detail, Chlorophyta, Bacillariophyta, and Dinoflagellates (e.g., low-temperature, small, high surface-to-volume genera) dominated in spring, whereas Chlorophyta, Bacillariophyta, and Cyanobacteria (e.g., high-temperature, large or colonial, low surface-to-volume genera) dominated in summer. The differences in physiological and morphological characteristics of algae were the internal cause triggering seasonal algal blooms. ② The main drivers of algal blooms were different in spring and summer. Spring blooms were controlled by water temperature (WT), mixing depth (i.e., Zmix), and light availability (i.e., Zeu/Zmix), whereas summer blooms were jointly influenced by WT, Zmix, Zeu/Zmix, and total phosphorus (TP). The differences in the changes of the major drivers were external causes triggering seasonal algal blooms. ③ The water environment thresholds starting seasonal algal blooms were different in spring and summer. The thresholds of WT, Zmix, and Zeu/Zmix in spring were>9.4℃, <10.9 m, and>0.24, respectively, whereas the thresholds of WT, Zmix, Zeu/Zmix, and TP in summer were>16.0℃, <11.6 m, >0.16, and>0.011 mg·L-1, respectively. Based on the research on the mechanism of seasonal algal blooms and related thresholds, this work will provide a reference for the control of subsequent algal blooms. |
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