• 关键词：铜绿微囊藻  抑制效率  金鱼藻  环棱螺  光合活性

• 基金项目：中国博士后基金（No.2021M702494）；苏州市吴江区东太湖水源地管理项目 （No.2022020090）；苏州市水利水务科技项目（No.2022012）

• 牛漾聃
• 同济大学环境科学与工程学院，上海 200082

• 黄清辉
• 同济大学环境科学与工程学院，上海 200082

• 沈小兵
• 苏州市吴江区水务局，苏州 215200

• 李建华
• 同济大学环境科学与工程学院，上海 200082

• 杨昌涛
• 同济大学环境科学与工程学院，上海 200082

• 摘要：沉水植物和螺类是生物防治有害水华的重要手段，然而目前关于这两者对有害蓝藻的协同抑制效率和作用机制尚不清楚.本研究利用沉水植物金鱼藻与铜锈环棱螺在实验室内探究草-螺组合系统对铜绿微囊藻（Microcystis aeruginosa）生长的抑制效果.结果表明，金鱼藻组、 环棱螺组及草-螺组合系统均显著降低了体系内蓝藻Chl-a浓度、总Chl-a浓度和铜绿微囊藻密度，与初始相比，蓝藻活体Chl-a浓度分别减少99.24%、100.00%和98.61%，铜绿微囊藻密度分别减少98.64%、86.44%和97.71%.草-螺共培养和金鱼藻单独培养均可以显著抑制铜绿微囊藻生长，效果相似，而环棱螺单独培养可以使蓝藻Chl-a浓度和光曲线参数值降为零，同时使得微囊藻细胞全部失活.金鱼藻与环棱螺都可以 降低铜绿微囊藻光合活性，草-螺共培养系统可以最大程度降低藻类整体的生长潜能.研究发现，草-螺耦合系统对铜绿微囊藻的总体抑制效率略低于两者单独抑制效率，表明金鱼藻和环棱螺在此过程中存在微弱的拮抗作用，但由于草-螺耦合系统的抑制成效同样显著，且抑制途径 更多样，同时能更好地维持水体营养盐平衡.在实践过程中建议加强沉水植物和螺类的互利共生关系，可以起到更好的抑藻效果.

• Abstract：Snails and submerged plants are important biological controls for harmful algal blooms. However， the synergistic inhibitory efficiency and mechanism of submerged plants and snails on harmful cyanobacteria remain poorly understood. In this study， the submerged plant （Ceratophyllum demersum L.） and snail （Bellamya aeruginosa） were used in the laboratory to investigate the inhibitory effect and mechanism of the macrophyte-snail combination system on the growth and photosynthetic activity of Microcystis aeruginosa. The results showed that the Chl-a of cyanobacteria and total Chl-a as well as the density of Microcystis aeruginosa in the system significantly decreased in all three experimental treatments （except the blank control group）. In the macrophyte， snail， and macrophyte-snail treatments， the Chl-a of cyanobacteria decreased by 99.24%， 100.00%， and 98.61%， whereas the density of Microcystis aeruginosa decreased by 98.64%， 86.44%， and 97.71%， respectively. The co-culture of Ceratophyllum demersum L. and Bellamya aeruginosa， as well as the single culture of Ceratophyllum demersum L.， may significantly suppress the growth of Microcystis aeruginosa. Moreover， both the Chl-a of cyanobacteria and the parameters of photosynthetic activity were decreased to zero in the treatment of Bellamya aeruginosa， and all Microcystis aeruginosa cells were inactivated. Furthermore， Ceratophyllum demersum L. and Bellamya aeruginosa may restrict Microcystis aeruginosa’s photosynthetic activity， and the co-culture system might reduce algae’s total potential photosynthetic capacity to the greatest extent. The overall inhibitory efficiency of the macrophyte-snail system was found to be slightly lower than the inhibitory efficiency of the two systems alone， indicating that Ceratophyllum demersum L. and Bellamya aeruginosa had a weak antagonistic effect in the inhibitory process. In contrast， the inhibition effect of the macrophyte-snail coupling system was significant， and the inhibition mechanisms are more diversified. At the same time， the water’s nutrient balance can be better maintained. As a result， it is recommended that the mutually beneficial symbiotic relationship between submerged plants and snails be strengthened in practice， as this can play a better role in algal suppression.

• Key words：Microcystis aeruginosa  inhibitory efficiency  Ceratophyllum Demersum L.  Bellamya aeruginos  photosynthetic activity

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