Observation of O2:CO2 exchange ratio for net turbulent fluxes and its application to forest carbon cycles
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An average O2:CO2 exchange ratio for net turbulent O2 and CO2 fluxes in a cool temperate deciduous forest in central Japan was obtained based on an aerodynamic method using continuous measurements of atmospheric O2/N2 ratio and CO2 concentration. The average daily mean O2:CO2 exchange ratio was 0.86 during summer, 2013, a value significantly lower than the 1.1 used as a globally averaged terrestrial biospheric O2:CO2 exchange ratio in a CO2 budget analysis. Using the value of 0.86, along with the O2:CO2 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 O2/CO2 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 CO2 efflux observed using an open-flow soil chamber method. These results suggest that the simultaneous observation of O2 and CO2 concentrations in a forest has potential as a new tool to evaluate the forest CO2 budget.
KeywordsO2:CO2 exchange ratio for net turbulent O2 and CO2 fluxes in a forest Atmospheric O2/N2 ratio Aerodynamic method Forest carbon cycle Global carbon cycle
We thank K. Muto, N. Aoki, T. Usami, and H. Yatabe (National Institute of Advanced Industrial Science and Technology, Japan), K. Kurumado, and S. Yoshitake (River Basin Research Center, Gifu University) for their support during measurements and analyses. This study was partly supported by JSPS KAKENHI Grant Numbers 22710002, 24241008 and 24310017, and the Global Environment Research Account for National Institutes of the Ministry of the Environment, Japan.
- Baldocchi D, Falge E, Gu L, Olson R, Hollinger D, Running S, Anthoni P, Bernhofer C, Davis K, Evans R, Fuentes J, Goldstein A, Katul G, Law B, Lee X, Malhi Y, Meyers T, Munger W, Oechel W, Pau UKT, Pilegaard K, Schmid HP, Valentini R, Verma S, Vesala T, Wilson K, Wofsy S (2001) FLUXNET: a new tool to study the temporal and spatial variability of ecosystem-scale carbon dioxide, water vapor, and energy flux densities. Bull Am Meteor Soc 82:2415–2434CrossRefGoogle Scholar
- Ito A, Muraoka H, Koizumi H, Saigusa N, Murayama S, Yamamoto S (2006) Seasonal variation in leaf properties and ecosystem carbon budget in a cool-temperate deciduous broad-leaved forest: simulation analysis at Takayama site, Japan. Ecol Res 21:137–149. doi: 10.1007/s11284-005-0100-7 CrossRefGoogle Scholar
- Keeling RF (1988) Development of an interferometric oxygen analyzer for precise measurement of the atmospheric O2 mole fraction. PhD Thesis, Harvard University, CambridgeGoogle Scholar
- Laws E, Sakshaug E, Babin M, ves Dandonneau Y, Falkowski P, Geider R, Legendre L, Morel A, Sondergaard M, Takahashi M, Williams PJ (2002) Photosynthesis and primary productivity in marine ecosystem: practical aspects and application of techniques. Joint Global Ocean Flux Study (JGOFS) Report 36Google Scholar
- Le Quéré C, Moriarty R, Andrew RM, Peters GP, Ciais P, Friedlingstein P, Jones SD, Sitch S, Tans P, Arneth A, Boden TA, Bopp L, Bozec Y, Canadell JG, Chevallier F, Cosca CE, Harris I, Hoppema M, Houghton RA, House JI, Jain A, Johannessen T, Kato E, Keeling RF, Kitidis V, Klein Goldewijk K, Koven C, Landa CS, Landschützer P, Lenton A, Lima ID, Marland G, Mathis JT, Metzl N, Nojiri Y, Olsen A, Ono T, Peters W, Pfeil B, Poulter B, Raupach MR, Regnier P, Rödenbeck C, Saito S, Salisbury JE, Schuster U, Schwinger J, Séférian R, Segschneider J, Steinhoff T, Stocker BD, Sutton AJ, Takahashi T, Tilbrook B, van der Werf GR, Viovy N, Wang Y-P, Wanninkhof R, Wiltshire A, Zeng N (2014) Global carbon budget 2014. Earth Syst Sci Data Discuss 7:521–610. doi: 10.5194/essdd-7-521-2014 CrossRefGoogle Scholar
- Mo W, Nishimura N, Mariko S, Uchida M, Inatomi M, Koizumi H (2005b) Interannual variation in CO2 effluxes from soil and snow surface in a cool-temperate deciduous broad-leaved forest. Phyton 45:99–107Google Scholar
- Murayama S, Takamura C, Yamamoto S, Saigusa N, Morimoto S, Kondo H, Nakazawa T, Aoki S, Usami T, Kondo M (2010) Seasonal variations of atmospheric CO2, δ13C, and δ18O at a cool temperate deciduous forest in Japan: Influence of Asian monsoon. J Geophys Res 115:D17304. doi: 10.1029/2009JD013626 CrossRefGoogle Scholar
- Pan Y, Birdsey RA, Fan J, Houghton R, Kauppi PE, Kurz WA, Phillips OL, Shvidenkko A, Lewis SL, Canadell JG, Ciais P, Jackson RB, Pacala SW, McGuire AD, Piao S, Rautiainen A, Sitch S, Hayes D (2011) A large and persistent carbon sink in the world’s forests. Science 333:988–993CrossRefPubMedGoogle Scholar
- Severinghaus, J (1995) Studies of the terrestrial O2 and carbon cycles in sand dune gases and in biosphere 2. Ph. D. thesis, Columbia University, New YorkGoogle Scholar
- van der Laan-Luijkx IT, Karstens U, Steinbach J, Gerbig C, Sirignano C, Neubert REM, van der Laan S, Meijer HAJ (2010) CO2, δO2/N2 and APO: observations from the Lutjewad, Mace Head and F3 platform flask sampling network. Atmos Chem Phys 10:10691–10704. doi: 10.5194/acp-10-10691-2010 CrossRefGoogle Scholar
- Watanabe T, Kondo J (1990) The influence of canopy structure and density upon the mixing length within and above vegetation. J Meteorol Soc Jpn 68:227–235Google Scholar