Application of eco-physiological models to the climatic interpretation of δ13C and δ18O measured in Siberian larch tree-rings
CHURAKOVA, Olga V.
Universität Bern / University of Bern [UNIBE]
Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] [ETH Zürich]
Institut Paul Scherrer [IPS]
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Universität Bern / University of Bern [UNIBE]
Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] [ETH Zürich]
Institut Paul Scherrer [IPS]
CHURAKOVA, Olga V.
Universität Bern / University of Bern [UNIBE]
Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] [ETH Zürich]
Institut Paul Scherrer [IPS]
Universität Bern / University of Bern [UNIBE]
Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] [ETH Zürich]
Institut Paul Scherrer [IPS]
LAUNOIS, Thomas
Interactions Sol Plante Atmosphère [UMR ISPA]
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
Interactions Sol Plante Atmosphère [UMR ISPA]
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
PEYLIN, Philippe
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
Modélisation des Surfaces et Interfaces Continentales [MOSAIC]
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
Modélisation des Surfaces et Interfaces Continentales [MOSAIC]
MASSON-DELMOTTE, Valérie
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
Glaces et Continents, Climats et Isotopes Stables [GLACCIOS]
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Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] [LSCE]
Glaces et Continents, Climats et Isotopes Stables [GLACCIOS]
Langue
en
Article de revue
Ce document a été publié dans
Dendrochronologia. 2016, vol. 39, p. 51-59
Elsevier
Résumé en anglais
Tree-ring width and stable isotopic composition are widely used for the reconstruction of environmental conditions. Eco-physiological models simulating δ13C and δ18O provide tools to constrain the interpretation of measured ...Lire la suite >
Tree-ring width and stable isotopic composition are widely used for the reconstruction of environmental conditions. Eco-physiological models simulating δ13C and δ18O provide tools to constrain the interpretation of measured tree-ring variations and their relationships to environmental variables. Here, we apply biochemical models of photosynthesis and a model of stomatal conductance to simulate the intra-annual dynamics of δ13C values in photo assimilates and tree-rings. We use these models to investigate the physiological responses of larch trees growing on permafrost to variability in precipitation and permafrost depth associated with regional temperature and precipitation changes. Tree-ring width, δ13C and δ18O in wood and cellulose were measured in larch (Larix cajanderi Mayr.) samples from northeastern Yakutia (69°N, 148°E) for the period from 1945 to 2004 and used for comparisons with modeled δ13C and δ18O data. Mechanistic models that quantify physical and biochemical fractionation processes leading to oxygen isotope variation in organic matter are used to identify source water for trees growing on permafrost in Siberia. These models allowed us to investigate the influence of a variety of climatic factors on Siberian forest ecosystem water relations that impact isotope fractionation. Based on δ13C and δ18O in tree wood and cellulose measurements as well as outputs from different eco-physiological models, we assume that larch trees from northeastern Yakutia can have limited access to the additional thawed permafrost water during dry summer periods.< Réduire
Mots clés en anglais
Northeastern Yakutia
stable isotopes in tree-ring width
permafrost
climate
water source
thaw depth
Origine
Importé de halUnités de recherche