Observation of O2:CO2 exchange ratio for net turbulent fluxes and its application to forest carbon cycles

An average O 2 :CO 2 exchange ratio for net turbulent O 2 and CO 2 fluxes in a cool temperate deciduous forest in central Japan was obtained based on an aerodynamic method using continuous measurements of atmospheric O 2 /N 2 ratio and CO 2 concentration. The average daily mean O 2 :CO 2 exchange ra...

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Bibliographic Details
Published in:Ecological research 2015-03, Vol.30 (2), p.225-234
Main Authors: Ishidoya, Shigeyuki, Murayama, Shohei, Kondo, Hiroaki, Saigusa, Nobuko, Kishimoto-Mo, Ayaka W., Yamamoto, Susumu
Format: Article
Language:English
Subjects:
Aerodynamic method
Air temperature
Atmosphere
Atmospheric O2/N2 ratio
Behavioral Sciences
Biomedical and Life Sciences
Carbon cycle
Carbon dioxide
Deciduous forests
Ecological function
Ecology
Ecosystems
Evolutionary Biology
Forest carbon cycle
Forest ecosystems
Forestry
Forestry research
Forests
Global carbon cycle
Interdisciplinary research
Life Sciences
O2:CO2 exchange ratio for net turbulent O2 and CO2 fluxes in a forest
Plant Sciences
Primary production
Special Feature
Temperate forests
Zoology
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Summary:An average O 2 :CO 2 exchange ratio for net turbulent O 2 and CO 2 fluxes in a cool temperate deciduous forest in central Japan was obtained based on an aerodynamic method using continuous measurements of atmospheric O 2 /N 2 ratio and CO 2 concentration. The average daily mean O 2 :CO 2 exchange ratio was 0.86 during summer, 2013, a value significantly lower than the 1.1 used as a globally averaged terrestrial biospheric O 2 :CO 2 exchange ratio in a CO 2 budget analysis. Using the value of 0.86, along with the O 2 :CO 2 exchange ratio of 1.11 for the ecosystem respiration (RE) and 1.00 for the gross primary production (GPP), the net ecosystem production (NEP) measured with an eddy covariance method was separated into GPP and RE using a one-box canopy O 2 /CO 2 budget model. The estimated average daily-mean GPP and RE values were consistent, within estimation errors, with those estimated from an empirical function of air temperature; the RE values were also comparable to the soil CO 2 efflux observed using an open-flow soil chamber method. These results suggest that the simultaneous observation of O 2 and CO 2 concentrations in a forest has potential as a new tool to evaluate the forest CO 2 budget.
ISSN:0912-3814
1440-1703
DOI:10.1007/s11284-014-1241-3