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Seasonal and daily cycles of stem radial variation of Pinus pinaster in a drought-prone environment

Vieira Joana, Rossi Sergio, Campelo Filipe, Freitas Helena et Nabais Cristina. (2013). Seasonal and daily cycles of stem radial variation of Pinus pinaster in a drought-prone environment. Agricultural and Forest Meteorology, 180, p. 173-181.

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URL officielle: http://dx.doi.org/doi:10.1016/j.agrformet.2013.06....

Résumé

High resolution measurements of stem diameter variation can provide valuable information on the growth process as well as the tree water status. This study investigates the hourly variations in stem radial increment of maritime pine growing on the west coast of Portugal, under a Mediterranean climate with a pronounced summer drought. We tested the hypotheses that (1) stem radius variation in maritime pine has a daily and seasonal pattern that reflects the availability of water and (2) that once the internal water storage is depleted the tree enters a quiescent state. During 2010, stem radius variations were monitored in four similar trees with automatic dendrometers. Tree water deficit was extracted from the stem radial variation. The stem cycle approach was used to divide the daily cycles into contraction, recovery and increment phases. The seasonal cycle was divided into five periods: winter dormancy, spring growth, pre-summer contraction, summer quiescence and autumn re-hydration. Amplitude and duration of each phase were calculated for each cycle and correlated with precipitation, maximum and minimum temperature. Continuous positive radial increment started in spring and reached its maximum by the end of June. A shrinking period was observed in summer, with amplitudes of contraction and recovery 10 times higher than in the other periods. The inability of the trees to recover from the water lost due to transpiration was responsible for stem shrinking and quiescence observed during summer. In autumn, a period of re-hydration and rapid expansion was observed after precipitation, restoring the tree to a physiologically active state. Daily variations in stem radius of maritime pine were mainly determined by the course of transpiration and thus dependent on temperature and tree water status.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:01681923
Volume:180
Pages:p. 173-181
Version évaluée par les pairs:Oui
Date:2013
Identifiant unique:10.1016/j.agrformet.2013.06.009
Sujets:Sciences naturelles et génie > Sciences appliquées > Climatologie et météorologie
Sciences naturelles et génie > Sciences appliquées > Foresterie et sciences du bois
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Unités de recherche > Centre de recherche sur la Boréalie (CREB)
Mots-clés:Automatic dendrometer, mediterranean, Pinus pinaster, summer quiescence, tree water deficit, water relations
Déposé le:05 juin 2023 18:21
Dernière modification:05 juin 2023 18:21
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