ZHANGGuo-zheng,ZHAOMin,LIYong,et al.Release Characteristics of Dissolved Organic Matter during Decomposition of Aquatic Plants[J].China Water & Wastewater,2022,38(19):93-101.
Click Copy

Release Characteristics of Dissolved Organic Matter during Decomposition of Aquatic Plants

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第38卷 Number: 第19期 Page: 93-101 Column: Date of publication: 2022-10-01
Author(s):
ZHANG　Guo-zheng1; 2; 3;  ZHAO　Min4;  LI　Yong1; 2;  YING　Yan-jie1; 2; 3;  LU　Xue-jun5;  PAN　Ji-zheng3
（1. School of Environmental Science and Engineering， Suzhou University of Science and Technology， Suzhou 215009， China； 2. Jiangsu Key Laboratory of Environmental Science and Engineering， Suzhou University of Science and Technology， Suzhou 215009， China； 3. State Key Laboratory of Lake Science and Environment， Nanjing Institute of Geography & Limnology， Chinese Academy of Sciences， Nanjing 210008， China； 4. National East， Central and West Regional Demonstration Zone Management Committee， Lianyungang 222000， China； 5. Lianyungang Environmental Monitoring Station， Lianyungang 222001， China）
Keywords:
aquatic plant;  decomposition;  dissolved organic matter;  release;  three-dimensional fluorescence spectrum
Abstract:
The decomposition process of four different aquatic plants was investigated and the release characteristics of dissolved organic matter (DOM) in Wanshandang ecological restoration demonstration area was analyzed by laboratory simulation experiments. The concentration of dissolved organic carbon (DOC) in water increased first and then decreased rapidly due to the decomposition of four kinds of aquatic plants. The contents of humus and aromatic compounds containing unsaturated C=C bonds increased with the increase in decomposition time. The DOMs released from Hydrocharis dubia, Myriophyllum spicatum and Eichhornia crassipes residues were dominated by fulic acid in the early stage of decomposition, and humic acid was dominated after 16, 29 and 22 days, respectively. However, the DOM in decomposed water released from Phragmites australis residue was always dominated by fulic acid. According to the results of three?dimensional fluorescence and parallel factor analysis (EEMs-PARAFAC), three kinds of fluorescent organic compounds were produced during the decomposition of four kinds of aquatic plant, which mainly included humus?like components C1, C2 and protein?like components C3, and humus-like substances were dominant. The two principal components identified by principal component analysis accounted for 79.9%, 72.6%, 83.0% and 83.6% of the total variance of the four aquatic plants decomposed water, respectively, which showed the differences in DOM characteristics and fluorescence components of water caused by plant decomposition processes.
Last Update: 2022-10-01