Journal of Tianjin Agricultural University ›› 2020, Vol. 27 ›› Issue (1): 37-43.doi: 10.19640/j.cnki.jtau.2020.01.009

• Researches and Scientific Notes • Previous Articles     Next Articles

Effects of carp(Cyprinus carpio)on phytoplankton and environmental factors in paddy fields

PENG Hui-hui1,2, ZHANG Kai2, CHEN Cheng-xun1, XIE Jun2, LI Zhi-fei2, YU Er-meng1,2, LIU Long-fei1, GONG Wang-bao2, TIAN Jing-jing2, WANG Guang-jun1,2,3,Corresponding Author   

  1. 1. College of Fisheries, Tianjin Agricultural University, Tianjin 300384, China;
    2. Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Ministry of Agriculture and Rural Affairs, Guangzhou 510380, China;
    3. Guangdong Ecological Remediation of Aquaculture Pollution Research Center, Guangzhou 510380, China
  • Received:2019-04-17 Published:2020-04-01

Abstract: In order to study the effect of carp(Cyprinus carpio)on the phytoplankton community structure and water quality in paddy field, the phytoplankton and environment factors of trial group(rice-carp coculture)and control group(rice-monoculture)were studied. The results showed that there were 18 species belonged to 7 phylums in the trial group and 24 species belonged to 5 phylums in the control group, and the density and biomass of phytoplankton in the trial group were significantly higher than those in the control group(P<0.05). There were 11 dominant species in the trial group, concentrated in Chlorophyta and Bacillariophyta, and 13 dominant species in the control group, concentrated in Cyanophyta and Bacillariophyta. The indexes of Shannon-Weiner and Margalef indicated that the phytoplankton diversity of the rice-carp-coculture mode was lower than that of rice-monoculture mode(P<0.05). There was no significant difference in ammonia nitrogen and nitrite between the trial group and the control group(P>0.05), but the nitrate, total nitrogen of water(WTN)and COD was significantly lower than those of the control group(P<0.05). The results showed that the phytoplankton community structure and water quality of paddy fields had been improved after the addition of carp.

Key words: paddy fields, Cyprinus carpio, phytoplankton, environmental factors

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