RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2020, Vol. 29 >> Issue (5): 1140-1149.doi: 10.11870/cjlyzyyhj202005009

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Analysis of the Production Process of Chromophoric Dissolved Organic Matter (CDOM) and the Change of Microbial Community in the Decomposition Process of Different Aquatic Plants

LIU Xin 1, LIU Hao 1,2, JIANG He-long 2, SONG Na 2   

  1. (1.Advantage Disciplines of Environmental Engineering in Jiangsu Universities, College of Biology and the
    Environment, Nanjing Forestry University, Nanjing 210037, China; 2.State Key Laboratory of Lake Science and
    Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China)
  • Online:2020-05-20 Published:2020-07-13

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Abstract: Abstract：In this study, two dominant plants of Taihu Lake, Potamogeton malaianus and Phragmites communis, were subjected to indoor decomposing experiments.UV-visible spectroscopy and Illuminar high-throughput sequencing were used to study the production of Chromophoric Dissolved Organic Matter (CDOM) and microbial community changes during the decomposition of different plants.The results showed that the removal rate of Potamogeton malaianus residues was higher than that of the Phragmites communis group on the second day, 10th day and 30th day.The Dissolved Organic Carbon (DOC) content of the Potamogeton malaianus group was lower than that of the Phragmites communis group on the second day and higher than the Phragmites communis group on the 10th and 30th day.The relative concentration of CDOM and its relative molecular mass of the Potamogeton malaianus group were higher than the Phragmites communis group on the second day and lower than the Phragmites communis group on the 10th and 30th day.The microbes in the initial water body belong to 34 phyla and 156 classes.Thirty days later, the microbial diversity in Potamogeton malaianus and Phragmites communis decomposing solution were reduced and belong to 23 and 19 phyla, and 95 and 78 genera, respectively.During the degradation process of the two plants, the degradation organic matter microorganisms in the water gradually occupied a major portion, such as Bacteroides, Treponema and Ruminococcaceae.These microorganisms are more abundant in the Phragmites communis decomposition water.

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