Study on the effects of phytoplankton in eutrophic water around farmland by aquatic plants and Daphnia magna

doi:10.14088/j.cnki.issn0439-8114.2021.03.008

Abstract

Abstract: To study on the effects of phytoplankton in eutrophic water around farmland by aquatic plants and Daphnia magna, the combination of two organisms on the restoration of eutrophic water were investigated by taking Daphnia magna as the representative of filter-feeding animals, Myriophyllum aquaticum and Ceratophyllum demersum as the representatives of submerged plants. The results showed that D. magna significantly inhibited phytoplankton density, cyanobacteria density, chlorophyll-a concentration and the contents of microcystin, and the low density （25 ind/L） group had better inhibitory effects. In the late period of the test （15 d to 20 d）, the inhibitory effect was weakened. At the end of the test （20 d）, there was no significant difference in the contents of microcystins between the high density （100 ind/L） group and the control group. Similarly, both M. aquaticum and C. demersum could inhibit the increase of phytoplankton density, cyanobacteria density and chlorophyll-a concentration, and the inhibitory effect of M. aquaticum was better. However, C. demersum had non-significancant inhibition effect on the contents of microcystin. At the end of the experiment, the submerged plants and D. magna combination had stronger inhibitory effect than the single D. magna and single plant, and the combination of low-density D. magna and M. aquaticum was the best. Compared with the single D. magna treatment, the submerged plants and D. magna combination can effectively control the rise of the microcystin produced in the late stage.

Key words: eutrophic, Daphnia magna, Myriophyllum aquaticum, Ceratophyllum demersum

CLC Number:

ZHANG Chun-xue, WEI Xiao-cheng, WANG Han-yang, ZHENG Xiang-qun, YANG Bo. Study on the effects of phytoplankton in eutrophic water around farmland by aquatic plants and Daphnia magna[J]. HUBEI AGRICULTURAL SCIENCES, 2021, 60(3): 42-49.

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