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Limnology

, Volume 4, Issue 1, pp 0025–0033 | Cite as

Dissolved organic carbon and fluorescence in Lake Hovsgol: factors reducing humic content of the lake water

  • K. Hayakawa
  • T. Sekino
  • T. Yoshioka
  • M. Maruo
  • M. Kumagai
RESEARCH PAPER

Abstract

 Lake Hovsgol is a large tectonic lake located in northern Mongolia, which has extremely transparent lake water. In our survey, the dissolved organic carbon of the lake water was 80–100 μM-C, and the fluorescence intensity in an excitation and emission matrix was very low. The brown color and high content of humic substances in river water flowing from a watershed consisting of grassland and forests rapidly declined in the coastal area of the lake. The decrease in humic content may be due not only to dilution by the lake water but also to flocculation and photobleaching. Among tectonic lakes in Asia, Lake Hovsgol would appear to have unique biological and hydrological features that reduce humic content and help to maintain water transparency.

Key words Water color Dissolved organic carbon Fluorescence Excitation and emission matrix Humic substances 

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Copyright information

© The Japanese Society of Limnology 2003

Authors and Affiliations

  • K. Hayakawa
    • 1
  • T. Sekino
    • 2
  • T. Yoshioka
    • 2
  • M. Maruo
    • 3
  • M. Kumagai
    • 1
  1. 1.Lake Biwa Research Institute, 1-10 Uchidehama, Otsu, Shiga 520-0806, Japan Tel. +81-77-526-4800; Fax +81-77-526-4803 e-mail: hayakawa@lbri.go.jpJP
  2. 2.Research Institute for Humanity and Nature, Kyoto, JapanJP
  3. 3.University of Shiga Prefecture, Hikone, JapanJP

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