Characteristics of dissolved organic matter in lakes with different eutrophic levels in southeastern Hubei Province, China

Weixiang REN; Xiaodong WU; Xuguang GE; Guiying LIN; Mengdie ZHOU; Zijie LONG; Xinhui YU; Wei TIAN

doi:10.1007/s00343-020-0102-x

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Characteristics of dissolved organic matter in lakes with different eutrophic levels in southeastern Hubei Province, China

Chemistry | Updated：2023-05-20

- Characteristics of dissolved organic matter in lakes with different eutrophic levels in southeastern Hubei Province, China
- Journal of Oceanology and Limnology Vol. 39, Issue 4, Pages: 1256-1276(2021)
- Affiliations：
  
  1.College of Urban and Environmental Sciences, Hubei Normal University, Huangshi 435002, China
  2.Huangshi Key Laboratory of Soil Pollution and Control, Huangshi 435002, China
- Author bio：
  
  Xiaodong WU, E-mail:wuxd03@163.com
- Funds：
- DOI：10.1007/s00343-020-0102-x
  CLC：
- Received：26 February 2020，
  
  Accepted：18 April 2020，
  
  Online First：25 August 2020，
  
  Published：2021-07
- Accepted：
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Weixiang REN, Xiaodong WU, Xuguang GE, et al. Characteristics of dissolved organic matter in lakes with different eutrophic levels in southeastern Hubei Province, China[J]. Journal of Oceanology and Limnology, 2021, 39(4): 1256-1276.
DOI：

Weixiang REN, Xiaodong WU, Xuguang GE, et al. Characteristics of dissolved organic matter in lakes with different eutrophic levels in southeastern Hubei Province, China[J]. Journal of Oceanology and Limnology, 2021, 39(4): 1256-1276. DOI： 10.1007/s00343-020-0102-x.

摘要

Abstract

Dissolved organic matter (DOM) plays a crucial role in both the carbon cycle and geochemical cycles of other nutrient elements

which is of importance to the management and protection of the aquatic environments. To achieve a more comprehensive understanding the characteristics of DOM in the Changjiang (Yangtze) River basin

water samples from four natural lakes (Xiandao

Baoan

Daye

and Qingshan) in southeastern Hubei Province in China with different eutrophication levels were collected and analyzed. The optical characteristics were analyzed using ultraviolet-visible spectrophotometry and excitation-emission matrix spectroscopy coupled with parallel factor analysis. The results show that: (1) two humic-like components (C1 and C2) and two protein-like substances (C3 and C4) of DOM were identified in all waterbodies; (2) C3 originated primarily from the degradation of microalgae and contributed substantially to humic-like components during transformation. C4 was widely present in the Changjiang River basin and its formation was related to microbial activity

rather than algal blooms or seasons. Influenced by the water mixing

the protein-like components were more likely to be transformed by microorganism

whereas humic-like components were more easily to be photobleached; (3) the concentration of DOM and the fluorescence intensity of humic-like components gradually increased with rising lake eutrophication levels. With respect to protein-like components

only C3 showed changes along the eutrophication gradients; (4) DOM showed a high affinity with permanganate index (COD

) and chlorophyll

(chl

) while the relationship was variable with phosphorus. This study helps us systematically understand the DOM characteristics

microbial activities

and pollutant transformation in the Changjiang River basin and provides reference to the ecological restoration of aquatic environments.

关键词

Keywords

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