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Tree Physiology Advance Access published online on February 11, 2009
Tree Physiology, doi:10.1093/treephys/tpp008
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© The Author 2009. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Respiratory fluxes in a Canary Islands pine forest

Gerhard Wieser1,2, Andreas Gruber3, Michael Bahn4, Enrique Catalá5, Estefanía Carrillo5, Maria Soledad Jiménez5 and Domingo Morales5

1 Department of Alpine Timberline Ecophysiology, Federal Research and Trainings Centre for Forests, Natural Hazards and Landscape, Rennweg 1, A-6020 Innsbruck, Austria
2 Corresponding author (gerhard.wieser{at}uibk.ac.at)
3 Institute of Botany, University of Innsbruck, Sternwartestraße 15, A-6020 Innsbruck, Austria
4 Institute of Ecology, University of Innsbruck, Sternwartestraße 15, A-6020 Innsbruck, Austria
5 Department of Plant Biology (Plant Physiology), University of La Laguna, C/Astrofísico Francisco Sánchez s/n. E-38207 La Laguna, Tenerife, Spain


  Abstract

We estimated component and whole-ecosystem CO2 efflux (RECO) in a Pinus canariensis Chr. Sm. ex DC stand in Tenerife, Canary Islands, an ecotone with strong seasonal changes in soil water availability. From November 2006 to February 2008, we measured foliage, stem and soil CO2 efflux by chamber techniques. Site-specific CO2 efflux models obtained from these chamber measurements were then combined with half-hourly measurements of canopy, stem and soil temperature as well as soil water potential, leaf and stem surface area data for scaling up component-specific CO2 efflux to RECO. Integrated over an entire year, RECO was 938 g of C m–2 in 2007 and comprised the following component fluxes: 77% from soil, 11% from stems and 12% from foliage. Whole-ecosystem CO2 efflux varied markedly throughout the year. During the cold and wet season, RECO generally followed the seasonal trends in temperature, and during the warm and dry summer, however, RECO was significantly reduced because of limited soil water availability in the main rooting horizon.

Keywords: ecosystem CO2 efflux, foliage, Mediterranean climate, Pinus canariensis, soil, stem, summer drought

Received June 10, 2008; Accepted September 25, 2008


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