Tree differences in primary and secondary growth drive convergent scaling in leaf area to sapwood area across Europe
KIORAPOSTOLOU, Natasa
Università degli Studi di Padova = University of Padua [Unipd]
Department of Environmental Sciences
Voir plus >
Università degli Studi di Padova = University of Padua [Unipd]
Department of Environmental Sciences
KIORAPOSTOLOU, Natasa
Università degli Studi di Padova = University of Padua [Unipd]
Department of Environmental Sciences
Università degli Studi di Padova = University of Padua [Unipd]
Department of Environmental Sciences
COCHARD
Laboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]
Laboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]
LOBO-DO-VALE, Raquel
Universidade de Lisboa = University of Lisbon = Université de Lisbonne [ULISBOA]
< Réduire
Universidade de Lisboa = University of Lisbon = Université de Lisbonne [ULISBOA]
Langue
en
Article de revue
Ce document a été publié dans
New Phytologist. 2018, vol. 218, n° 4, p. 1383-1392
Wiley
Résumé en anglais
1- Trees scale leaf (AL) and xylem (AX) areas to couple leaf transpiration and carbon gain with xylem water transport. Some species are known to acclimate in AL : AX balance in response to climate conditions, but whether ...Lire la suite >
1- Trees scale leaf (AL) and xylem (AX) areas to couple leaf transpiration and carbon gain with xylem water transport. Some species are known to acclimate in AL : AX balance in response to climate conditions, but whether trees of different species acclimate in AL : AX in similar ways over their entire (continental) distributions is unknown. 2- We analyzed the species and climate effects on the scaling of AL vs AX in branches of conifers (Pinus sylvestris, Picea abies) and broadleaved (Betula pendula, Populus tremula) sampled across a continental wide transect in Europe. 3- Along the branch axis, AL and AX change in equal proportion (isometric scaling: b ˜ 1) as for trees. Branches of similar length converged in the scaling of AL vs AX with an exponent of b = 0.58 across European climates irrespective of species. Branches of slow‐growing trees from Northern and Southern regions preferentially allocated into new leaf rather than xylem area, with older xylem rings contributing to maintaining total xylem conductivity. 4- In conclusion, trees in contrasting climates adjust their functional balance between water transport and leaf transpiration by maintaining biomass allocation to leaves, and adjusting their growth rate and xylem production to maintain xylem conductance.< Réduire
Mots clés
plant architecture
structural balance
Mots clés en anglais
xylem
allocation
climate change
functional balance
leaf area
sapwood
Origine
Importé de halUnités de recherche