CO_(2)与敌草隆对小球藻生长和光合生理的复合效应  

Combined effect of CO_(2) and diuron on the growth and photosynthetic physiology of Chlorella sp.

作　　者：贺闯 李桢桢 徐军田 HE Chuang;LI Zhenzhen;XU Juntian(School of Marine Science and Fisheries,Jiangsu Ocean University,Lianyungang 222005,China;School of Biological Science,University of Hong Kong,Hong Kong 999077,China)

机构地区：[1]江苏海洋大学海洋科学与水产学院,江苏连云港222005 [2]香港大学生物科学学院,中国香港999077

出　　处：《江苏海洋大学学报(自然科学版)》2025年第1期8-15,共8页Journal of Jiangsu Ocean University:Natural Science Edition

基　　金：江苏省自然资源开发专项基金(海洋科技创新项目)(JSZRHYKJ202206);江苏省现代渔业产业研究体系(JATS[2023]478)。

摘　　要：由于人类活动的增加,大气中CO_(2)水平日益升高引起水体酸化现象,对浮游植物的生理活动和生态功能产生显著影响。同时,有机污染物敌草隆等大量使用,随地表径流进入江河湖海,也将对水生浮游植物带来不良影响。将小球藻暴露在4个敌草隆质量浓度(0,0.2,1,5μg/L)和2个CO_(2)水平(LC:当前大气CO_(2)水平、HC:1 000μatm)下,探究其单因素及联合作用对小球藻的光合生理特性的影响。结果显示,高碳条件下,0μg/L敌草隆质量浓度组与对照组相比,小球藻生长速率提高16.7%、光合速率提高126%,呈现显著的正面效应。在低碳条件下,中、高质量浓度敌草隆分别使小球藻生长速率降低15.0%和29.0%,光合速率降低28.5%和44.6%。CO_(2)与敌草隆存在明显的交互作用。在高CO_(2)与高质量浓度敌草隆的复合作用下,小球藻生长速率下降27.2%,表明了敌草隆能抵消CO_(2)对小球藻的正面效应。研究揭示了在未来大气CO_(2)水平升高的背景下,酸化加剧了敌草隆对小球藻的毒性效应,这将进一步降低水生浮游植物的初级生产力,对水域生态系统的稳定与健康构成威胁。Due to the increasing human activities,the rising CO_(2) levels in the atmosphere are causing acidification of water,significantly affecting the physiological activities and ecological functions of phytoplankton.Additionally,the widespread use of organic pollutants such as diuron is entering rivers,lakes,and seas through surface runoff,which will also have adverse effects on aquatic phytoplankton.This study exposed Chlorella sp.to four diuron mass concentrations(0,0.2,1,5μg/L)and two CO_(2) levels(LC:current atmospheric CO_(2) level,HC:1000μatm)to investigate the effects of single factors and their interactions on the photosynthetic physiological characteristics of Chlorella sp.The results showed that under high carbon conditions,compared to the control group,the group with Oμg/L diuron mass concentration had a 16.7%increase in growth rate and a 126%increase in photosynthetic rate,showing a significant positive effect.Under low carbon conditions,medium and high mass concentrations of diuron decreased the growth rate of Chlorella sp.by 15.0%and 29.0%,respectively,and the photosynthetic rate by 28.5%and 44.6%,respectively.There was a clear interaction between CO_(2) and diuron.Under the combined effect of high CO_(2) and high mass concentration of diuron,the growth rate of Chlorella sp.decreased by 27.2%,indicating that diuron can counteract the positive effect of CO_(2) on Chlorella sp.The study reveals that in the context of future rising atmospheric CO_(2) levels,acidification exacerbates the toxic effects of diuron on Chlorella sp.,further reducing the primary productivity of aquatic phytoplankton,posing a threat to the stability and health of aquatic ecosystems.

关 键 词：小球藻 CO_(2) 敌草隆 光合作用 复合效应 

分 类 号：X524[环境科学与工程—环境工程]