Observatorio de I+D+i UPM

Memorias de investigación
Artículos en revistas:
Stem CO2 efflux and its contribution to ecosystem CO2 efflux decrease with drought in a Mediterranean forest stand
Año:2014
Áreas de investigación
  • Ciencias de la tierra,
  • Biología vegetal, animal y ecología
Datos
Descripción
The 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.
Internacional
Si
JCR del ISI
Si
Título de la revista
Agricultural And Forest Meteorology
ISSN
0168-1923
Factor de impacto JCR
3,894
Información de impacto
Volumen
195-196
DOI
Número de revista
Desde la página
61
Hasta la página
72
Mes
SIN MES
Ranking
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Participantes
  • Autor: Jesus Rodriguez Calcerrada (UPM)
  • Autor: Nicolas Martin-StPaul (INRA)
  • Autor: Morine Lempereur (CNRS)
  • Autor: Jean-Marc Ourcival (CNRS)
  • Autor: MªCarmen del Rey (CNRS)
  • Autor: Richard Joffre (CNRS)
  • Autor: Serge Rambal (CNRS)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Genética, Fisiología e Historia Forestal
  • Departamento: Sistemas y Recursos Naturales
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