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Vertical soil–air CO2 dynamics at the Takayama deciduous broadleaved forest AsiaFlux site

  • Special Feature: Original Article
  • Lessons learned from CarboEastAsia: Carbon and water cycles in East Asian terrestrial ecosystems
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Journal of Forest Research

Abstract

At the Takayama deciduous broadleaved forest Asiaflux site in Japan, the ecosystem carbon dynamics have been studied for more than two decades. In 2005, we installed non-dispersive infrared CO2 sensors in the soil below the site’s flux tower to systematically study vertical soil–air CO2 dynamics and explain the behavior of soil surface CO2 efflux. Soil–air CO2 concentrations measured from June 2005 through May 2006 showed sinusoidal variation, with maxima in July and minima in winter, similar to the soil CO2 effluxes measured simultaneously using open-flow chambers. Soil–air CO2 concentrations increased with soil depth from 5 to 50 cm: from 2,000 to 8,000 ppm in the summer and from 2,000 to 3,000 ppm in the winter under snow. Summer soil–air CO2 concentrations were positively correlated with soil moisture on daily and weekly scales, indicating that the Oi, Oe, and A horizons, where decomposition is accelerated by high-moisture conditions, contributed substantially to CO2 emissions. This result is consistent with the short residence time (about 2 h) of CO2 in the soil and larger emissions in shallow soil layers based on our diffusion model. We revealed for the first time that soil–air CO2 concentrations in winter were correlated with both snow depth and wind speed. CO2 transfer through the snow was hundreds of times the gas diffusion rates in the soil. Our estimate of the CO2 efflux during the snow-cover season was larger than previous estimates at TKY, and confirmed the important contribution of the snow-cover season to the site’s carbon dynamics.

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Acknowledgments

This work was funded mainly by the Global Environment Research Fund of the Japan Ministry of the Environment (S-1: Integrated Study for Terrestrial Carbon Management of Asia in the 21st Century Based on Scientific Advancement). This work is also partly supported by the “Development of technology for mitigation and adaptation to climate change” project of the Japanese Ministry of Agriculture, Forestry and Fisheries and by KAKENHI (23310017). We are indebted to Mr. K. Abe, Mr. H. Iino, and Mr. T. Kamata of the National Institute for Agro-Environmental Sciences for performing the fieldwork. We also thank Mr. K. Kurumado of the Institute for Basin Ecosystem Studies, Gifu University, for providing a comfortable work area at the research station. Finally, we thank the journal editors and two anonymous referees for their valuable comments on early drafts of our paper.

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Correspondence to Seiichiro Yonemura.

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Yonemura, S., Yokozawa, M., Sakurai, G. et al. Vertical soil–air CO2 dynamics at the Takayama deciduous broadleaved forest AsiaFlux site. J For Res 18, 49–59 (2013). https://doi.org/10.1007/s10310-012-0385-7

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  • DOI: https://doi.org/10.1007/s10310-012-0385-7

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