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Effects of iron and humic acid on competition between Microcystis aeruginosa and Scenedesmus obliquus revealed by HPLC analysis of pigments

查看全文 作  者:Miaomiao [1]ZHAO;Qiang [1]HE;Chongtai [1]CHEN;Yaqi [1]TIAN;Jing [1]WEI;Pengfei [2]DUAN;Haiming [1]WU;Ming [1,3]LI 高影响力作者 机构地区:[1]College of Natural Resources and Environment,Northwest A&F University,Yangling 712100,China;[2]Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province,Nanyang Normal University,Nanyang 473061,China;[3]Scientific Laboratory of Heyang Agricultural Environment and Farmland Cultivation,Ministry of Agriculture and Rural Aff airs,Heyang 715300,China高影响力机构 出  处:《Journal of Oceanology and Limnology》索引2021年第39卷第2期,共11页高影响力期刊 基  金:Supported by the Sichuan Science and Technology Program(No.2019YFH0127);the Joint Foundation of Shaanxi(No.2019JLM-59);the Scientific and Technological Innovation Team of Water Ecological Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province(No.17454)。 摘  要:Iron is a vital micronutrient for growth of bloom-forming Microcystis aeruginosa and competition with other algae,and its availability is affected by humic acid.The effect of iron and humic acid on growth and competition between M.aeruginosa and Scenedesmus obliquus was assessed.The results showed the growth of M.aeruginosa and S.obliquus in mono-cultures was inhibited by humic acid at low iron concentrations(0.01 mg/L);the maximum inhibition ratios were 67.84%and 38.31%,respectively.The inhibition of humic acid on the two species was significantly alleviated when iron concentrations were 1.00 mg/L,with the maximum inhibition rate reduced to 5.82%for M.aeruginosa and to 23.06%for S.obliquus.S.obliquus was the dominant species in mixed cultures,and the mutual inhibition between M.aeruginosa and S.obliquus at low iron concentration was greater than that at high iron concentration.The inhibition of S.obliquus on M.aeruginosa was reduced at low iron concentrations;it increased at high iron concentrations,as concentrations of humic acid rose. 关 键 词:MICROCYSTIS SCENEDESMUS IRON humic acid COMPETITION pigment
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