湖泊科学2024，Vol.36Issue(1)：43-51,9.DOI:10.18307/2024.0112
华南热带水库丰水期浮游植物群落对氮、磷、铁加富的响应
Responses of phytoplankton communities to N,P,Fe enrichments in wet season of trop-ical reservoirs in southern China:A case study of Dashahe Reservoir,Guangdong Prov-ince
摘要
Abstract
Eutrophication is one of the main threats to aquatic ecosystems,and various nutrients combined flow into water.It is im-portant to understand the responses of phytoplankton communities to enrichment of multiple nutrients for eutrophication control.To elucidate the response of phytoplankton communities to three essential nutrients(N,P and Fe)in tropical reservoirs of southern China,we analyzed the variation of N,P,Fe and Chi.a in a typical reservoir(Dashahe Reservoir)from dry seasaon(from Januar-y to March)to wet season(from April to June)2021.An in-situ experiment was conducted to clarify the responses of phytoplank-ton abundance and diversity to the N,P and Fe enrichment.Compared with the conditions from January to March,the total phos-phorus concentration increased significantly from April to June,the total Fe concentration showed an increasing trend but fluctuated greatly among months,total nitrogen concentration reached the lowest value in April then increased slowly.Accompanied with the variation of nutrients,Chl.a concentration increased from 5 μg/L in March to 29 μg/L in May.The results of in-situ enrichment experiment showed that cyanobacteria,chlorophyta and diatom were the main compositions of phytoplankton.The increase in phyto-plankton abundance was observed in all treatments,but only the combined addition of both N and P(NP and FeNP)caused sig-nificant increase of biomass(indicated by Chl.a concentration).The abundance responses to the same nutrient addition were differ-ent among phyla and species,and community structure and dominant species were significant differences among treatments.The community diversity of treatments pronounced higher than control.Cyanobacteria abundance increased in all of the treatments(N,P,NP,FeN,FeP and FeNP)except the treatment of single Fe addition,chlorophyta abundance significantly increased in NP and FeNP treatments while no significant difference was observed between these two treatments,and abundance of diatom significantly increased in single addition of N and P treatments.These results suggested that phytoplankton abundance was primarily limited by N and P.Therefore,the increase in abundance depends on the synergistic rather than the single effect of nutrients.The any addi-tion of N,P and Fe can affect community structure and diversity.Our study implied that eutrophication management,especially controlling cyanobacteria blooms,should consider the synergistic effect of N,P and Fe.关键词
氮/磷/铁/浮游植物/群落结构/大沙河水库Key words
Nitrogen/phosphorus/iron/phytoplankton/community structure/Dashahe Reservoir引用本文复制引用
谢静,苏宇亮,吴斌,张依,肖利娟,顾继光..华南热带水库丰水期浮游植物群落对氮、磷、铁加富的响应[J].湖泊科学,2024,36(1):43-51,9.基金项目
国家自然科学基金项目(31901144)和中国科学院野外站联盟项目(KFJ-SW-YW026)联合资助. （31901144）
