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  Leaf wax n-alkane δ D values of field-grown barley reflect leaf water δD values at the time of leaf formation

Sachse, D., Gleixner, G., Wilkes, H., & Kahmen, A. (2010). Leaf wax n-alkane δ D values of field-grown barley reflect leaf water δD values at the time of leaf formation. Geochimica et Cosmochimica Acta, 74(23), 6741-6750. doi:10.1016/j.gca.2010.08.033.

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Sachse, D., Author
Gleixner, G.1, Author           
Wilkes, H., Author
Kahmen, A., Author
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1Molecular Biogeochemistry Group, Dr. G. Gleixner, Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497773              

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Free keywords: hydrogen isotope ratios lipid biosynthesis aquatic plants c-4 grasses seasonal-variation modern angiosperms individual lipids epicuticular wax d/h ratios fractionation
 Abstract: Leaf wax n-alkanes from barley (Hordeum vulgure) from a field in Switzerland exhibited changes in delta D values on the order of 20 parts per thousand over a growing season, while source water (soil water) and leaf water varied by 40 parts per thousand. Additionally the seasonal variability in delta D values of leaf wax n-alkanes of different barley leaves can only be found across different leaf generations (i.e. leaves that were produced at different times during the growing season) while n-alkane delta D values did not vary significantly within a leaf generation. Interestingly, delta D values of n-alkanes correlated best with the delta D values of leaf water at midday of the sampling day but showed no significant correlation with soil water (e.g. precipitation) delta D values. These results provide empirical evidence that leaf wax delta D values record leaf water enrichment, and therefore integrate the isotopic effects of precipitation and evapotranspiration. Our results show that leaf wax n-alkane delta D values from grasses are 'locked in' early during leaf development and hence record the environmental drivers of leaf water enrichment, such as vapor pressure deficit (VPD). Our data have important implications for the interpretation of paleorecords of leaf wax delta D. We suggest that leaf wax n-alkane delta D values from sedimentary records could be used to estimate changes in the degree of leaf water enrichment and hence VPD. (C) 2010 Elsevier Ltd. All rights reserved.

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Language(s): eng - English
 Dates: 2010
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.gca.2010.08.033
ISI: ://000284192000007
Other: BGC1417
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Title: Geochimica et Cosmochimica Acta
Source Genre: Journal
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Publ. Info: Oxford : Pergamon
Pages: - Volume / Issue: 74 (23) Sequence Number: - Start / End Page: 6741 - 6750 Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/954925401558
ISSN: 0016-7037