Journal Title
Title of Journal: New Forests
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Publisher
Kluwer Academic Publishers
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Authors: J RodríguezCalcerrada J A Pardos L Gil I Aranda
Publish Date: 2006/10/20
Volume: 33, Issue: 1, Pages: 67-80
Abstract
In 2000 oneyearold seedlings of pyrenean oak Quercus pyrenaica Willd and sessile oak Quercus petraea Matt Liebl were planted in a thinned and an unthinned plot in a pinewood Pinus sylvestris and in a nearby clearing In summer 2002 and 2003 water relations and gas exchange parameters were measured to address the impact of drought on the seedlings Chlorophyll a fluorescence was also measured to explore leaf photochemistry and a possible nonstomatal limitation to photosynthesis A Reduction in stomatal conductance g in response to the decrease of predawn water potential Ψpd resulted the main cause affecting net carbon uptake Water potential at midday Ψmd was similar in both species but Quercus petraea was more sensitive to soil water deployment occurred along summer showing slightly lower Ψpd because worse recover of water potential during night Rate of photosynthesis was higher in Q␣pyrenaica probably in relation to its greater leaf mass per area LMA and nitrogen content per leaf area Na Mortality was highest in the clearing and lowest in the thinned pinewood Throughout the summer soil moisture was higher in the thinned area possibly because of the reduction in tree transpiring surface and interception of rainfall Accordingly Ψpd of both species was higher in the thinned siteThis research has been supported by the Consejería de Medio Ambiente y Desarrollo General de la Comunidad Autónoma de Madrid J RodríguezCalcerrada was supported by a scolarship from the Consejería de Educación de la Comunidad de Madrid CAM and the Fondo Social Europeo FSE We gratefully acknowledge Sven Mutke for reviewing this manuscript
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