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Effects of soil temperature and tidal condition on variation in carbon dioxide flux from soil sediment in a subtropical mangrove forest

Published online by Cambridge University Press:  26 July 2018

Mitsutoshi Tomotsune ,
Shinpei Yoshitake ,
Yasuo Iimura ,
Morimaru Kida ,
Nobuhide Fujitake ,
Hiroshi Koizumi  and
Toshiyuki Ohtsuka
Mitsutoshi Tomotsune*
Affiliation:
Faculty of Education and Integrated Arts and Sciences, Waseda University, 2-2 Wakamatsucho, Shinjuku, Tokyo 162–8480, Japan
Shinpei Yoshitake
Affiliation:
Takayama Field Station, River Basin Research Center, Gifu University, 919–47, Iwaicho, Takayama, Gifu 506–0815, Japan
Yasuo Iimura
Affiliation:
Department of Biological Resources Management, University of Shiga Prefecture, 2500, Hassakacho, Hikone, Shiga 522–8533, Japan
Morimaru Kida
Affiliation:
Graduate School of Agricultural Science, Kobe University, 1 Rokkodai, Nada, Kobe, Hyogo 657–8501, Japan
Nobuhide Fujitake
Affiliation:
Graduate School of Agricultural Science, Kobe University, 1 Rokkodai, Nada, Kobe, Hyogo 657–8501, Japan
Hiroshi Koizumi
Affiliation:
Faculty of Education and Integrated Arts and Sciences, Waseda University, 2-2 Wakamatsucho, Shinjuku, Tokyo 162–8480, Japan
Toshiyuki Ohtsuka
Affiliation:
River Basin Research Center, Gifu University, 1-1 Yanagido, Gifu 501–1193, Japan
*
*Corresponding author. Email: tomo.32104@aoni.waseda.jp
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Abstract:

The variation in CO2 flux from the forest floor is important in understanding the role of mangrove forests as a carbon sink. To clarify the effects of soil temperature and tidal conditions on variation in CO2 flux, sediment–atmosphere CO2 fluxes were measured between June 2012 and May 2013. We used the closed chamber method for two plots, with a 0.5 m difference in elevation (B, high elevation; R-B, low elevation), in a mangrove forest in south-western Japan. CO2 fluxes were highest in the warm season and showed a weak positive correlation with soil temperature in both forests. Estimated monthly CO2 flux showed moderate seasonal variation in accordance with the exposure duration of the soil surface under tidal fluctuation. Additionally, measured CO2 flux and soil temperature were slightly higher in the R-B plot than the B plot, although estimated annual CO2 flux was higher in the B plot than the R-B plot due to different exposure durations. These results suggest that variation in the exposure duration of the forest floor, which changes seasonally and microgeographically, is important in evaluating the annual CO2 flux at a local scale and understanding the role of mangrove ecosystems as regulators of atmospheric CO2.

Keywords

Bruguiera gymnorrhizacoastal ecosystemdecompositionRhizophora mucronataseasonalitysoil organic mattersoil respirationsoil temperaturetidal fluctuation
Type
Research Article
Information
Journal of Tropical Ecology , Volume 34 , Issue 4 , July 2018 , pp. 268 - 275
Copyright
Copyright © Cambridge University Press 2018 

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