INVESTIGADORES
MORÁN LÓPEZ Teresa
congresos y reuniones científicas
Título:
Water use efficiency and growth of P. sylvestris and Q. pubescens in the Pyrenean region. Responding to Rapid Environmental Change
Autor/es:
TERESA MORÁN LÓPEZ; SANTIAGO SABATÉ; PILAR LLORENS; RAFAEL POYATOS
Lugar:
Avila
Reunión:
Congreso; 12th European Ecological Federation Congress. Responding to Rapid Environmental Change; 2011
Institución organizadora:
European Ecological Federation
Resumen:
P. sylvestris and Q. pubescens mixed forests have roused ecophysiologists interest for several reasons. On one hand,P. sylvestris is a widely distributed specie adapted to a large range of climatic conditions. Although CO2 fertilizationhas enhanced its primary production in some areas, it remains unclear whether such pattern will continue in themid-term future under the projected Climate Change conditions in the region (increase in temperature and decreasein rainfall trends). In fact, high mortality rates associated with recent drought episodes have been reported in manyEuropean Scots pine populations including Mediterranean ones. On the other hand, Quercus pubescens, considereda sub-Mediterranean species adapted to xeric conditions, is expanding in some montane areas in detriment topinewoods, probably due to a more efficient water supply and higher resistance to cavitation events. Thus, analyzingevapotranspiration trends of both species seems important in order to forecast their vulnerability under increasingdrought conditions. Even more, shifts in forest composition related to sub-Mediterranean species expansion haveput them in the spotlight like Climate Change sensors. This work explores the development of two pinewoods andan oak forest in the Pyrenean region. It analyses water use efficiency (WUE) from two different approaches: isotopicdiscrimination (d13C) and tree-ring growth to evapotranspiration ratio. Besides, climatic signals are evaluated inorder to identify possible bottlenecks for Q. pubescent and P. sylvestris growth. A general increment in WUE, differentrelationships between isotopic and structural approximations in both species and lower climatic signals in Pubescentoak are expected.
