Unenriched xylem water contribution during cellulose synthesis influenced by atmospheric demand governs the intra-annual tree-ring δ18 O signature
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Unenriched xylem water contribution during cellulose synthesis influenced by atmospheric demand governs the intra-annual tree-ring δ18 O signature. / Martínez-Sancho, Elisabet; Cernusak, Lucas A; Fonti, Patrick; Gregori, Alessandro; Ullrich, Bastian; Pannatier, Elisabeth Graf; Gessler, Arthur; Lehmann, Marco M; Saurer, Matthias; Treydte, Kerstin.
in: NEW PHYTOL, Jahrgang 240, Nr. 5, 12.2023, S. 1743-1757.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - Unenriched xylem water contribution during cellulose synthesis influenced by atmospheric demand governs the intra-annual tree-ring δ18 O signature
AU - Martínez-Sancho, Elisabet
AU - Cernusak, Lucas A
AU - Fonti, Patrick
AU - Gregori, Alessandro
AU - Ullrich, Bastian
AU - Pannatier, Elisabeth Graf
AU - Gessler, Arthur
AU - Lehmann, Marco M
AU - Saurer, Matthias
AU - Treydte, Kerstin
N1 - © 2023 The Authors. New Phytologist © 2023 New Phytologist Foundation.
PY - 2023/12
Y1 - 2023/12
N2 - The oxygen isotope composition (δ18 O) of tree-ring cellulose is used to evaluate tree physiological responses to climate, but their interpretation is still limited due to the complexity of the isotope fractionation pathways. We assessed the relative contribution of seasonal needle and xylem water δ18 O variations to the intra-annual tree-ring cellulose δ18 O signature of larch trees at two sites with contrasting soil water availability in the Swiss Alps. We combined biweekly δ18 O measurements of soil water, needle water, and twig xylem water with intra-annual δ18 O measurements of tree-ring cellulose, xylogenesis analysis, and mechanistic and structural equation modeling. Intra-annual cellulose δ18 O values resembled source water δ18 O mean levels better than needle water δ18 O. Large parts of the rings were formed under high proportional exchange with unenriched xylem water (pex ). Maximum pex values were achieved in August and imprinted on sections at 50-75% of the ring. High pex values were associated with periods of high atmospheric evaporative demand (VPD). While VPD governed needle water δ18 O variability, we estimated a limited Péclet effect at both sites. Due to a variable pex , source water has a strong influence over large parts of the intra-annual tree-ring cellulose δ18 O variations, potentially masking signals coming from needle-level processes.
AB - The oxygen isotope composition (δ18 O) of tree-ring cellulose is used to evaluate tree physiological responses to climate, but their interpretation is still limited due to the complexity of the isotope fractionation pathways. We assessed the relative contribution of seasonal needle and xylem water δ18 O variations to the intra-annual tree-ring cellulose δ18 O signature of larch trees at two sites with contrasting soil water availability in the Swiss Alps. We combined biweekly δ18 O measurements of soil water, needle water, and twig xylem water with intra-annual δ18 O measurements of tree-ring cellulose, xylogenesis analysis, and mechanistic and structural equation modeling. Intra-annual cellulose δ18 O values resembled source water δ18 O mean levels better than needle water δ18 O. Large parts of the rings were formed under high proportional exchange with unenriched xylem water (pex ). Maximum pex values were achieved in August and imprinted on sections at 50-75% of the ring. High pex values were associated with periods of high atmospheric evaporative demand (VPD). While VPD governed needle water δ18 O variability, we estimated a limited Péclet effect at both sites. Due to a variable pex , source water has a strong influence over large parts of the intra-annual tree-ring cellulose δ18 O variations, potentially masking signals coming from needle-level processes.
KW - Trees/metabolism
KW - Water/metabolism
KW - Oxygen Isotopes/metabolism
KW - Xylem/metabolism
KW - Cellulose/metabolism
KW - Soil/chemistry
KW - Carbon Isotopes/metabolism
U2 - 10.1111/nph.19278
DO - 10.1111/nph.19278
M3 - SCORING: Journal article
C2 - 37753542
VL - 240
SP - 1743
EP - 1757
JO - NEW PHYTOL
JF - NEW PHYTOL
SN - 0028-646X
IS - 5
ER -