

FOLLOWUS
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 Affairs, Heyang 715300, China
Ming LI, E-mail: lileaf@nwsuaf.edu.cn
收稿:2020-01-08,
录用:2020-2-17,
网络首发:2020-04-11,
纸质出版:2021-02
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Effects of iron and humic acid on competition between
Miaomiao ZHAO, Qiang HE, Chongtai CHEN, et al. Effects of iron and humic acid on competition between
Effects of iron and humic acid on competition between
Miaomiao ZHAO, Qiang HE, Chongtai CHEN, et al. Effects of iron and humic acid on competition between
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.
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