Stem CO2 efflux and its contribution to ecosystem CO2 efflux decrease with drought in a Mediterranean forest stand

Rodriguez-Calcerrada, Jesus and Martin-StPaul, Nicolas K. and Lempereur, Morine and Ourcival, Jean-Marc and Rey, María del Carmen del and Joffre, Richard and Rambal, Serge (2014). Stem CO2 efflux and its contribution to ecosystem CO2 efflux decrease with drought in a Mediterranean forest stand. "Agricultural And Forest Meteorology", v. 195-96 ; pp. 61-72. ISSN 0168-1923. https://doi.org/10.1016/j.agrformet.2014.04.012.

Description

Title: Stem CO2 efflux and its contribution to ecosystem CO2 efflux decrease with drought in a Mediterranean forest stand
Author/s:
  • Rodriguez-Calcerrada, Jesus
  • Martin-StPaul, Nicolas K.
  • Lempereur, Morine
  • Ourcival, Jean-Marc
  • Rey, María del Carmen del
  • Joffre, Richard
  • Rambal, Serge
Item Type: Article
Título de Revista/Publicación: Agricultural And Forest Meteorology
Date: 2014
Volume: 195-96
Subjects:
Faculty: E.T.S.I. Montes (UPM)
Department: Sistemas y Recursos Naturales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

tThe rate of metabolic processes demanding energy in tree stems changes in relation with prevailing cli-matic conditions. Tree water availability can affect stem respiration through impacts on growth, phloemtransport or maintenance of diverse cellular processes, but little is known on this topic. Here we moni-tored seasonal changes in stem CO2efflux (Fs), radial growth, sap flow and non-structural carbohydrates intrees of Quercus ilex in a Mediterranean forest stand subjected since 2003 to either partial (33%) through-fall exclusion (E) or unchanged throughfall (C). Fsincreased exponentially during the day by an effectof temperature, although sap flow attenuated the increase in Fsduring the day time. Over the year, Fsalso increased exponentially with increasing temperatures, but Fscomputed at a standard temperatureof 15?C (F15s) varied by almost 4-fold among dates. F15swas the highest after periods of stem growth anddecreased as tree water availability decreased, similarly in C and E treatments. The decline in F15swas notlinked to a depletion of soluble sugars, which increased when water stress was higher. The proportionof ecosystem respiration attributed to the stems was highest following stem growth (23.3%) and lowestduring the peak of drought (6.5%). High within-year variability in F15smakes unadvisable to pool annualdata of Fsvs. temperature to model Fsat short time scales (hours to months) in Mediterranean-type for-est ecosystems. We demonstrate that water availability is an important factor governing stem CO2effluxand suggest that trees in Mediterranean environments acclimate to seasonal drought by reducing stemrespiration. Stem respiratory rates do not seem to change after a long-term increase in drought intensity,however.

More information

Item ID: 35424
DC Identifier: http://oa.upm.es/35424/
OAI Identifier: oai:oa.upm.es:35424
DOI: 10.1016/j.agrformet.2014.04.012
Deposited by: Memoria Investigacion
Deposited on: 28 May 2015 06:49
Last Modified: 01 Jan 2017 23:30
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