, Volume 10, Issue 3, pp 229–237 | Cite as

Effects of tidal fluctuations on CO2 and CH4 fluxes in the littoral zone of a brackish-water lake

  • Akinori Yamamoto
  • Mitsuru Hirota
  • Shizuo Suzuki
  • Yusuke Oe
  • Pengcheng Zhang
  • Shigeru Mariko


We examined the effects of tidal fluctuations on CO2 and CH4 fluxes from sediment or soil to the atmosphere in the littoral zone of a brackish-water lake during the growing seasons in 2004 and 2005. The dominant plants at the study site formed three sub-zones (Phragmites zone, Juncus zone and Miscanthus zone) across a topographic gradient on the shoreline. In the Phragmites and Juncus zones, we observed a positive correlation between hourly changes in CO2 and CH4 fluxes and changes in the water table. In particular, the magnitude and pattern of daily variation in CO2 and CH4 fluxes were different on days during spring tide and neap tide in the Phragmites and Juncus zones. Variations in CO2 and CH4 fluxes in the Phragmites and Juncus zones over the course of a day during spring tide were correlated with water-table level. We found that the rate of change of the water table, as distinguished from just differences in the water table, was a major environmental factor controlling the CO2 and CH4 fluxes. In the Miscanthus zone during spring tide, soil temperature was the main factor affecting daily variation in CO2 and CH4 fluxes.


Zonal vegetation Salt marsh Water table Spring tide Neap tide 



We are grateful for the support provided by the Institute for Environmental Sciences, and to Dr. Endoh of the Institute for Environmental Sciences, and Shin Mutsu Ogasawara, Inc., for assistance with the fieldwork. This study was supported by a Grant-in-Aid for Science Research (No. 15310004 and 19201002) from the Ministry of Education, Science, Sports and Culture, Japan.


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Copyright information

© The Japanese Society of Limnology 2009

Authors and Affiliations

  • Akinori Yamamoto
    • 1
  • Mitsuru Hirota
    • 2
  • Shizuo Suzuki
    • 3
  • Yusuke Oe
    • 1
  • Pengcheng Zhang
    • 1
  • Shigeru Mariko
    • 4
  1. 1.Graduate School of Life and Environmental SciencesUniversity of TsukubaTsukubaJapan
  2. 2.Sugadaira Montane Research CenterUniversity of TsukubaUedaJapan
  3. 3.Department of Environmental SimulationInstitute for Environmental SciencesRokkashoJapan
  4. 4.Faculty of Social SciencesHosei UniversityMachidaJapan

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