Articles | Volume 16, issue 1
https://doi.org/10.5194/bg-16-177-2019
https://doi.org/10.5194/bg-16-177-2019
Research article
 | 
17 Jan 2019
Research article |  | 17 Jan 2019

Comparison of CO2 and O2 fluxes demonstrate retention of respired CO2 in tree stems from a range of tree species

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Cited articles

Abramoff, R. Z. and Finzi, A. C.: Seasonality and partitioning of root allocation to rhizosphere soils in a midlatitude forest, Ecosphere, 7, e01547, https://doi.org/10.1002/ecs2.1547, 2016. 
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Angert, A. and Sherer, Y.: Determining the relationship between tree-stem respiration and CO2 efflux by δO2∕Ar measurements, Rapid Commun. Mass Sp., 25, 1752–1756, https://doi.org/10.1002/Rcm.5042, 2011. 
Angert, A., Muhr, J., Negron Juarez, R., Alegria Muñoz, W., Kraemer, G., Ramirez Santillan, J., Barkan, E., Mazeh, S., Chambers, J. Q., and Trumbore, S. E.: Internal respiration of Amazon tree stems greatly exceeds external CO2 efflux, Biogeosciences, 9, 4979–4991, https://doi.org/10.5194/bg-9-4979-2012, 2012. 
Aranda, I., Gil, L., and Pardos, J. A.: Seasonal changes in apparent hydraulic conductance and their implications for water use of European beech (Fagus sylvatica L.) and sessile oak [Quercus petraea (Matt.) Liebl] in South Europe, Plant Ecol., 179, 155–167, https://doi.org/10.1007/s11258-004-7007-1, 2005. 
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Combined measurement of CO2 / O2 fluxes in tree stems suggested that on average 41 % of the respired CO2 was not emitted locally to the atmosphere. This finding strengthens the recognition that CO2 efflux from tree stems is not an accurate measure of respiration. The CO2 / O2 fluxes did not vary as expected if CO2 dissolution in the xylem sap was the main driver for the CO2 retention. We suggest the examination of refixation of respired CO2 as a possible mechanism for CO2 retention.
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