摘要
探讨夏季高温背景下不同陆源输入对长湖浮游植物群落结构特征的影响,为长湖水环境保护和生态修复提供理论支撑。2021年夏季在长湖试验基地设置无陆源输入(CK)、低输入(LR)、中输入(MR)、高输入(HR)4个处理,以模拟夏季高温多雨背景下陆源营养物质输入对湖泊生态系统的影响。试验期间共鉴定出浮游植物6门79种,其中CK、LR、MR和HR处理分别鉴定出浮游植物68、71、69和64种,且均以绿藻门种类数最多,分别达29、28、27和26种,CK处理优势种主要为小球藻属(Chlorella sp.)、双对栅藻(Scenedesmus bijuga)、惠氏微囊藻(Microcystis wesenbergii)和水华束丝藻(Aphanizomenon flos-aquae),而陆源输入处理优势种主要为色球藻属(Chroococcus sp.)、假鱼腥藻属(Pseudanabaena sp.)和惠氏微囊藻。陆源输入的增加提高了水体中营养盐含量及浮游植物丰度、生物量、多样性和群落转换率,其中LR、MR和HR处理的浮游植物群落转换率较CK处理分别提高了34.95%、35.01%和37.64%,但浮游植物资源利用效率较CK处理分别降低了4.25%、10.80%和25.52%,群落结构向以蓝藻为优势的方向发展。线性回归模型显示,不同处理浮游植物的影响因子存在差异,其中CK和LR处理浮游植物与溶解氧呈显著(P<0.05)正相关关系,MR处理浮游植物与水温呈显著(P<0.05)正相关关系,HR处理浮游植物与总磷呈显著(P<0.05)负相关关系。
The frequency and severity of extreme weather events such as heavy rainfall have increased dramatically in recent years due to global warming.Heavy rainfall-induced terrestrial nutrient inputs is a key driver of alterations in freshwater ecosystems,severely impacting the structure of aquatic ecosystems.In this study,Changhu Lake was selected for research,and we explored the impact of terrestrial nutrient inputs on phytoplankton community structures and the relationships with environmental factors during the summer when temperatures were high and rainfalls intense.In the summer of 2021,a 25-day mesocosm experiment was conducted at a research station near Changhu Lake,using exclusively lake water for the experiment.Four rainfall-induced terrestrial nutrient input regimes were set:a control(CK)with no terrestrial nutrient input,and three treatments with low(LR),medium(MR),and high(HR)terrestrial nutrient inputs.Each treatment was run in triplicate,and water samples were collected every four days to determine environmental parameters and phytoplankton community structure.A total of 79 phytoplankton species from 6 phyla were identified during the study and 68,71,69,and 64 species were recorded in CK,LR,MR,and HR treatments,respectively.The species richness of Chlorophyta was highest in all four treatments,with 29,28,27,and 26 species in the CK,LR,MR,and HR treatments,respectively.The dominant species in the CK treatment were Chlorella sp.,Scenedesmus bijuga,Microcystis wesenbergii,and Aphanizomenon flos-aquae,whereas Chroococcus sp.,Pseudanabaena sp.,and Microcystis wesenbergii were the primary dominant species in the terrestrial nutrient input treatments.Increased terrestrial input increased the nutrient content of the water,as well as phytoplankton abundance,biomass and diversity.Community turnover rates of phytoplankton in the LR,MR,and HR treatments increased,respectively,by 34.95%,35.01%,and 37.64% compared to the CK treatment.In contrast,phytoplankton resource use efficiency decreased by 4.25%,10.80%,and 25.52%,respectively,and phytoplankton community structure shifted towards cyanobacteria.Linear regression analysis between phytoplankton community structure and environmental parameters showed that the factors driving phytoplankton dynamics varied with the level of nutrient input.Changes in the phytoplankton communities of the CK and LR treatments showed a significantly positive correlation with DO(P<0.05),a significant positive correlation with WT(P<0.05)in the MR treatment,and a significant negative correlation with TP(P<0.05)in the HR treatment.Our findings provide a scientific basis for managing the aquatic ecosystem in Changhu Lake.
作者
章叶飞
李滔
张露
胡琴
刘章勇
朱建强
杨军
ZHANG Yefei;LI Tao;ZHANG Lu;HU Qin;LIU Zhangyong;ZHU Jianqiang;YANG Jun(College of Agriculture,Yangtze University,Jingzhou 434025,P.R.China;Engineering Research Center of Ecology and Agricultural Use of Wetland,Ministry of Education,Yangtze University,Jingzhou 434025,P.R.China)
出处
《水生态学杂志》
北大核心
2025年第4期164-173,共10页
Journal of Hydroecology
基金
国家自然科学基金项目(41901135,U21A2039)。
关键词
强降雨
陆源输入
浮游植物
资源利用效率
长湖
heavy rainfall
terrestrial nutrient input
phytoplankton
resource use efficiency
Changhu Lake
作者简介
章叶飞,1999年生,男,硕士研究生,专业方向为水环境与水生态。E-mail:767692735@qq.com;通信作者:杨军。E-mail:junyang2@yangtzeu.edu.cn。
