LIN, Wen; NOORMETS, Asko; KING, John; MARSHALL, John; AKERS, Madison; CUCINELLA, Josh; FOX, Thomas; LAVINER, Marshall; MARTIN, Timothy; MCNULTY, Steve; MEEK, Cassandra; SAMUELSON, Lisa; SUN, Ge; VOGEL, Jason; WILL, Rodney; DOMEC, Jean-Christophe

doi:10.1093/treephys/tpab097

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LIN, Wen
Shenzhen University [Shenzhen]
North Carolina State University [Raleigh] [NC State]

NOORMETS, Asko
Texas A&M University System
North Carolina State University [Raleigh] [NC State]

KING, John
North Carolina State University [Raleigh] [NC State]

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Article de revue

Ce document a été publié dans

Tree Physiology. 2022-02-09, vol. 42, n° 1, p. 44 - 58

Oxford University Press (OUP)

Résumé en anglais

Considering the temporal responses of carbon isotope discrimination (13 C) to local water availability in the spatial analysis of 13 C is essential for evaluating the contribution of environmental and genetic facets of plant 13 C. Using tree-ring 13 C from years with contrasting water availability at 76 locations across the natural range of loblolly pine, we decomposed site-level 13 C signals to maximum 13 C in well-watered conditions (13 C max) and isotopic drought sensitivity (m) as a change in 13 C per unit change of Palmer's Drought Severity Index (PDSI). Site water status, especially the tree lifetime average PDSI, was the primary factor affecting 13 C max. The strong spatial correlation exhibited by m was related to both genetic and environmental factors. The long-term average water availability during the period relevant to trees as indicated by lifetime average PDSI correlated with 13 C max , suggesting acclimation in tree gas-exchange traits, independent of incident water availability. The positive correlation between lifetime average PDSI and m indicated that loblolly pines were more sensitive to drought at mesic than xeric sites. The m was found to relate to a plant's stomatal control and may be employed as a genetic indicator of efficient water use strategies. Partitioning 13 C to 13 C max and m provided a new angle for understanding sources of variation in plant 13 C, with several fundamental and applied implications.< Réduire

Mots clés en anglais

carbon isotope composition

intrinsic water use efficiency

Pinus taeda

water relations

water stress

URI

https://oskar-bordeaux.fr/handle/20.500.12278/195318

DOI

http://dx.doi.org/10.1093/treephys/tpab097

Project ANR

Assessments of vulnerability of mature and secondary forests to climatic water stress in Southeast Asia
Effet du changement climatique sur les stratégies d'amélioration de l'utilisation en eau des bassin versants et des systèmes agrosylvopastoraux Méditerranéens

Origine

Importé de hal

Unités de recherche

Interactions Soil Plant Atmosphere (ISPA) - UMR 1391