Deriving correlated climate and physiological signals from deuterium isotopomers in tree rings
| Autor: | Tatiana R. Betson, Angela Augusti, Jürgen Schleucher |
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| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Chemical geology 252 (2008): 1–8. doi:10.1016/j.chemgeo.2008.01.011 info:cnr-pdr/source/autori:Augusti, Angela; Betson, Tatiana R.; Schleucher, Jurgen/titolo:Deriving correlated climate and physiological signals from deuterium isotopomers in tree rings/doi:10.1016%2Fj.chemgeo.2008.01.011/rivista:Chemical geology/anno:2008/pagina_da:1/pagina_a:8/intervallo_pagine:1–8/volume:252 |
| DOI: | 10.1016/j.chemgeo.2008.01.011 |
| Popis: | The deuterium (D) abundance of tree-ring cellulose archives past climatic conditions, but previous attempts to access this archive have led to conflicting results. Based on an overview of D fractionation mechanisms in plants, we explain why past measurements of D abundance yield unreliable paleo signals. Our data show that variation in D abundance among the C-H groups (isotopomer variation) of tree-ring cellulose is generally greater than variation in D abundance due to climatic influences. A comparison of the D isotopomer abundances of soluble sugars of annual plants and of trees, and of tree-ring cellulose shows that an "isotopomer pattern" of the C-3 photosynthetic pathway is transmitted from soluble sugars to tree-ring cellulose. Differences in this pattern between oaks and conifers appear to be related to differences in metabolism. Furthermore, the patterns are modified by hydrogen isotope exchange between C-H groups and source water during cellulose synthesis. Based on these results, we propose a strategy to simultaneously reconstruct climate signals and signals related to tree physiology from D isotopomers of tree rings. Combination of climate signals and physiological signals may allow the detection of century-time-scale adaptations of trees to past environmental change, and help to forecast future adaptations. (C) 2008 Elsevier B.V. All rights reserved. |
| Databáze: | OpenAIRE |
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