Three-dimensional fluorescence characteristic differences of dissolved organic matter (DOM) from two typical reservoirs

Abstract

Three-dimensional (3D) excitation emission matrix (EEM) fluorescence spectroscopy was used to investigate the characteristics of dissolved organic matter (DOM) in two typical reservoirs, Changshou Lake and Dahonghai Lake. Characteristics of DOM were analyzed in view of the riparian ecosystems, which was the predominant cause of variance and the source of DOM in the reservoirs. The difference between two riparian ecosystems was significant due to anthropogenic impacts. Four fluorescent peaks were seen in DOM from both lakes. More protein-like components were observed in Changshou Lake, while more of the high-humic component (peak C) was seen in Dahonghai Lake. Additionally, correlation analysis suggested different sources for the protein-like and humic-like components. However, the two humic-like components (peak A and peak C) were from similar sources. Furthermore, specific fluorescence parameters indicated a higher degree of humification and allochthonous (terrigenous) DOM in Dahonghai, where riparian ecosystem was dominated by forest environment. DOM in Changshou Lake was significantly autochthonous (authigenic) and fresh because of human impacts in the riparian ecosystem such as agricultural runoff from farms and orchards. Comparison of the fluorescence characteristics with historical references confirmed that riparian ecosystems, and especially land uses related to human activities were important factors in the DOM characteristics of adjacent aquatic environments.

Keywords

Dissolved organic matter; Natural organic matter; Riparian ecosystem; Three-dimensional fluorescence

Published in

Zhongguo Huanjing Kexue/China Environmental Science
2015, volume: 35, number: 2, pages: 516-523
Publisher: Chinese Society for Environmental Sciences

SLU Authors

• Jiang, Tao

  • Department of Forest Ecology and Management, Swedish University of Agricultural Sciences
    
  • Chongqing Key Laboratory of Agricultural Resources and Environment
  • Southwest University

UKÄ Subject classification

Oceanography, Hydrology, Water Resources

Permanent link to this page (URI)

https://res.slu.se/id/publ/132050