Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Biogeosciences, 9, 4037-4044, 2012
https://doi.org/10.5194/bg-9-4037-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
22 Oct 2012
The contribution of respiration in tree stems to the Dole Effect
A. Angert1, J. Muhr2, R. Negron Juarez3, W. Alegria Muñoz4, G. Kraemer4, J. Ramirez Santillan4, J. Q. Chambers5, and S. E. Trumbore2 1The Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
2Department of Biogeochemical Processes, Max-Planck Institute for Biogeochemistry, Jena, Germany
3Ecology and Evolutionary Biology, Tulane University, 400 Lindy Boggs, New Orleans, LA, USA
4Universidad Nacional de la Amazonía Peruana, Facultad de Ciencias Forestales, Iquitos, Peru
5Lawrence Berkeley National Laboratory, Climate Sciences Department, Berkeley, CA, USA
Abstract. Understanding the variability and the current value of the Dole Effect, which has been used to infer past changes in biospheric productivity, requires accurate information on the isotopic discrimination associated with respiratory oxygen consumption in each of the biosphere components. Respiration in tree stems is an important component of the land carbon cycle. Here we measured, for the first time, the discrimination associated with tree stem oxygen uptake. The measurements included tropical forest trees, which are major contributors to the global fluxes of carbon and oxygen. We found discrimination in the range of 12.6–21.5‰, indicating both diffusion limitation, resulting in O2 discrimination values below 20‰, and alternative oxidase respiration, which resulted in discrimination values greater than 20‰. Discrimination varied seasonally, between and within tree species. Calculations based on these results show that variability in woody plants discrimination can result in significant variations in the global Dole Effect.

Citation: Angert, A., Muhr, J., Negron Juarez, R., Alegria Muñoz, W., Kraemer, G., Ramirez Santillan, J., Chambers, J. Q., and Trumbore, S. E.: The contribution of respiration in tree stems to the Dole Effect, Biogeosciences, 9, 4037-4044, https://doi.org/10.5194/bg-9-4037-2012, 2012.
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