O2:CO2 exchange ratios observed in a cool temperate deciduous forest ecosystem of central Japan

Shigeyuki Ishidoya; Shohei Murayama; Chikako Takamura; Hiroaki Kondo; Nobuko Saigusa; Daisuke Goto; Shinji Morimoto; Nobuyuki Aoki; Shuji Aoki; Takakiyo Nakazawa

doi:10.3402/tellusb.v65i0.21120

O2:CO2 exchange ratios observed in a cool temperate deciduous forest ecosystem of central Japan

Tellus B: Chemical and Physical Meteorology

Volume 65 (2013): Issue 1

By: Shigeyuki Ishidoya, Shohei Murayama, Chikako Takamura, Hiroaki Kondo, Nobuko Saigusa, Daisuke Goto, Shinji Morimoto, Nobuyuki Aoki, Shuji Aoki and Takakiyo Nakazawa

Open Access

|Jan 2013

Abstract

Detailed observations of O₂:CO₂ exchange ratios were conducted in a cool temperate deciduous forest located in central Japan. The exchange ratios of soil respiration and net assimilation were found to be 1.11±0.01 and 1.02±0.03 from soil chamber and branch bag measurements, respectively. Continuous measurements of the atmospheric O₂/N₂ ratio and the CO₂ concentration, made inside the canopy during a summer season, indicated that the average exchange ratio was lower in the daytime (0.87±0.02) than in the nighttime (1.03±0.02) with a daily mean value of 0.94±0.01. The observed average daytime and nighttime exchange ratios were nearly consistent with the corresponding values obtained from a one-box canopy O₂/CO₂ budget model simulation of net turbulent O₂ and CO₂ fluxes between the atmosphere and the forest ecosystem. Our results suggest that the daily mean exchange ratios of the net turbulent O₂ and CO₂ fluxes depend sensitively on the forest ecosystem processes.

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Articles in this issue

DOI: https://doi.org/10.3402/tellusb.v65i0.21120 | Journal eISSN: 1600-0889

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Language: English

Page range: 21120 - 21120

Submitted on: Apr 12, 2013

Accepted on: Oct 11, 2013

Published on: Jan 1, 2013

Published by: Stockholm University Press

In partnership with: Paradigm Publishing Services

Keywords:

O₂,

CO₂ exchange ratio,

forest ecosystem,

atmospheric O₂/N₂ ratio,

continuous measurements

© 2013 Shigeyuki Ishidoya, Shohei Murayama, Chikako Takamura, Hiroaki Kondo, Nobuko Saigusa, Daisuke Goto, Shinji Morimoto, Nobuyuki Aoki, Shuji Aoki, Takakiyo Nakazawa, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 65 (2013): Issue 1