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

摘要: An average O2:CO2 exchange ratio for net turbulent O2 and CO2 fluxes in a cool temperate deciduous forest central Japan was obtained based on an aerodynamic method using continuous measurements of atmospheric O2/N2 concentration. The daily mean 0.86 during summer, 2013, value significantly lower than the 1.1 used as globally averaged terrestrial biospheric budget analysis. Using 0.86, along with 1.11 ecosystem respiration (RE) 1.00 gross primary production (GPP), (NEP) measured eddy covariance separated into GPP RE one-box canopy O2/CO2 model. estimated daily-mean values were consistent, within estimation errors, those from empirical function air temperature; also comparable to soil efflux observed open-flow chamber method. These results suggest that simultaneous observation concentrations has potential new tool evaluate budget.