Web of Science: 21 citations, Scopus: 20 citations, Google Scholar: citations
Seasonal variability of foliar photosynthetic and morphological traits and drought impacts in a Mediterranean mixed forest
Sperlich, Dominik (Centre de Recerca Ecològica i Aplicacions Forestals)
Chang, C. T. (Centre de Recerca Ecològica i Aplicacions Forestals)
Peñuelas, Josep (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Gracia, Carles (Centre de Recerca Ecològica i Aplicacions Forestals)
Sabaté i Jorba, Santi (Centre de Recerca Ecològica i Aplicacions Forestals)

Date: 2015
Abstract: The Mediterranean region is a hot spot of climate change vulnerable to increased droughts and heat waves. Scaling carbon fluxes from leaf to landscape levels is particularly challenging under drought conditions. We aimed to improve the mechanistic understanding of the seasonal acclimation of photosynthesis and morphology in sunlit and shaded leaves of four Mediterranean trees (Quercus ilex L. , Pinus halepensis Mill. , Arbutus unedo L. and Quercus pubescens Willd. ) under natural conditions. Vc,max and Jmax were not constant, and mesophyll conductance was not infinite, as assumed in most terrestrial biosphere models, but varied significantly between seasons, tree species and leaf position. Favourable conditions in winter led to photosynthetic recovery and growth in the evergreens. Under moderate drought, adjustments in the photo/biochemistry and stomatal/mesophyllic diffusion behaviour effectively protected the photosynthetic machineries. Severe drought, however, induced early leaf senescence mostly in A. unedo and Q. pubescens, and significantly increased leaf mass per area in Q. ilex and P. halepensis. Shaded leaves had lower photosynthetic potentials but cushioned negative effects during stress periods. Species-specificity, seasonal variations and leaf position are key factors to explain vegetation responses to abiotic stress and hold great potential to reduce uncertainties in terrestrial biosphere models especially under drought conditions.
Note: Número d'acord de subvenció EC/FP7/238366
Note: Número d'acord de subvenció EC/FP7/610028
Note: Número d'acord de subvenció MINECO/CGL2011-30590-C02-01
Note: Número d'acord de subvenció MICINN/CSD2008-00040
Note: Número d'acord de subvenció MICINN/CGL2006-01293
Note: Número d'acord de subvenció AGAUR/2014/SGR-274
Rights: Tots els drets reservats
Language: Anglès.
Document: article ; recerca ; acceptedVersion
Subject: Abiotic stress ; Arbutus unedo ; Jmax ; Leaf position ; Leaf traits ; Pinus halepensis ; Quercus ilex ; Quercus pubescens ; Seasonality ; Vc,max
Published in: Tree physiology, Vol. 35 issue 5 (May 2015) p. 501-520, ISSN 0829-318X

DOI: 10.1093/treephys/tpv017


Acceptat
33 p, 990.2 KB

Suplement
11 p, 914.1 KB

Figures
11 p, 1.3 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (scientific output) > Experimental sciences > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals) > Imbalance-P
Articles > Research articles
Articles > Published articles

 Record created 2015-06-05, last modified 2019-02-19



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