Covariation between oxygen and hydrogen stable isotopes declines along the path from xylem water to wood cellulose across an aridity gradient

© 2023 The Authors. New Phytologist © 2023 New Phytologist Foundation.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 240(2023), 5 vom: 07. Dez., Seite 1758-1773
1. Verfasser: Holloway-Phillips, Meisha (VerfasserIn)
Weitere Verfasser: Cernusak, Lucas A, Nelson, Daniel B, Lehmann, Marco M, Tcherkez, Guillaume, Kahmen, Ansgar
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2023
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Australia aridity cellulose hydrogen isotopes isotope tree-ring oxygen isotopes paleo-environmental reconstruction Oxygen S88TT14065 mehr... Cellulose 9004-34-6 Carbon Isotopes Hydrogen 7YNJ3PO35Z Water 059QF0KO0R Oxygen Isotopes
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520 |a Oxygen and hydrogen isotopes of cellulose in plant biology are commonly used to infer environmental conditions, often from time series measurements of tree rings. However, the covariation (or the lack thereof) between δ18 O and δ2 H in plant cellulose is still poorly understood. We compared plant water, and leaf and branch cellulose from dominant tree species across an aridity gradient in Northern Australia, to examine how δ18 O and δ2 H relate to each other and to mean annual precipitation (MAP). We identified a decline in covariation from xylem to leaf water, and onwards from leaf to branch wood cellulose. Covariation in leaf water isotopic enrichment (Δ) was partially preserved in leaf cellulose but not branch wood cellulose. Furthermore, whilst δ2 H was well-correlated between leaf and branch, there was an offset in δ18 O between organs that increased with decreasing MAP. Our findings strongly suggest that postphotosynthetic isotope exchange with water is more apparent for oxygen isotopes, whereas variable kinetic and nonequilibrium isotope effects add complexity to interpreting metabolic-induced δ2 H patterns. Varying oxygen isotope exchange in wood and leaf cellulose must be accounted for when δ18 O is used to reconstruct climatic scenarios. Conversely, comparing δ2 H and δ18 O patterns may reveal environmentally induced shifts in metabolism 
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650 4 |a aridity 
650 4 |a cellulose 
650 4 |a hydrogen isotopes 
650 4 |a isotope tree-ring 
650 4 |a oxygen isotopes 
650 4 |a paleo-environmental reconstruction 
650 7 |a Oxygen  |2 NLM 
650 7 |a S88TT14065  |2 NLM 
650 7 |a Cellulose  |2 NLM 
650 7 |a 9004-34-6  |2 NLM 
650 7 |a Carbon Isotopes  |2 NLM 
650 7 |a Hydrogen  |2 NLM 
650 7 |a 7YNJ3PO35Z  |2 NLM 
650 7 |a Water  |2 NLM 
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650 7 |a Oxygen Isotopes  |2 NLM 
700 1 |a Cernusak, Lucas A  |e verfasserin  |4 aut 
700 1 |a Nelson, Daniel B  |e verfasserin  |4 aut 
700 1 |a Lehmann, Marco M  |e verfasserin  |4 aut 
700 1 |a Tcherkez, Guillaume  |e verfasserin  |4 aut 
700 1 |a Kahmen, Ansgar  |e verfasserin  |4 aut 
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