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Theoretical and Applied Climatology

, Volume 109, Issue 1–2, pp 39–49 | Cite as

Measurement of methane flux over an evergreen coniferous forest canopy using a relaxed eddy accumulation system with tuneable diode laser spectroscopy detection

  • Ayaka SakabeEmail author
  • Ken Hamotani
  • Yoshiko Kosugi
  • Masahito Ueyama
  • Kenshi Takahashi
  • Akito Kanazawa
  • Masayuki Itoh
Original Paper

Abstract

Very few studies have conducted long-term observations of methane (CH4) flux over forest canopies. In this study, we continuously measured CH4 fluxes over an evergreen coniferous (Japanese cypress) forest canopy throughout 1 year, using a micrometeorological relaxed eddy accumulation (REA) system with tuneable diode laser spectroscopy (TDLS) detection. The Japanese cypress forest, which is a common forest type in warm-temperate Asian monsoon regions with a wet summer, switched seasonally between a sink and source of CH4 probably because of competition by methanogens and methanotrophs, which are both influenced by soil conditions (e.g., soil temperature and soil moisture). At hourly to daily timescales, the CH4 fluxes were sensitive to rainfall, probably because CH4 emission increased and/or absorption decreased during and after rainfall. The observed canopy-scale fluxes showed complex behaviours beyond those expected from previous plot-scale measurements and the CH4 fluxes changed from sink to source and vice versa.

Keywords

Methanotrophs Eddy Covariance Sonic Anemometer Volumetric Soil Water Content Eddy Covariance Measurement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

This work was supported in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Ayaka Sakabe
    • 1
    Email author
  • Ken Hamotani
    • 2
  • Yoshiko Kosugi
    • 1
  • Masahito Ueyama
    • 2
  • Kenshi Takahashi
    • 3
  • Akito Kanazawa
    • 1
  • Masayuki Itoh
    • 4
  1. 1.Division of Environmental Science and Technology, Graduate School of AgricultureKyoto University, Laboratory of Forest HydrologySakyo-kuJapan
  2. 2.School of Life and Environmental SciencesOsaka Prefecture UniversitySakaiJapan
  3. 3.Research Institute for Sustainable HumanosphereKyoto UniversityUjiJapan
  4. 4.Center for Ecological ResearchKyoto UniversityOtsuJapan

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