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- W2593526045 abstract "Abstract The hydrogen isotopic composition of leaf waxes (δDwax) primarily reflects that of plant source water. Therefore, sedimentary δDwax records are increasingly used to reconstruct the δD of past precipitation (δDp) and to investigate paleohydrologic changes. Such reconstructions rely on estimates of apparent fractionation (eapp) between δDp and the resulting δDwax. However, eapp values are modified by numerous environmental and biological factors during leaf wax production. As a result, eapp can vary widely among plant species and growth forms. This complicates estimation of accurate eapp values and presents a central challenge to quantitative leaf wax paleohydrology. During the 2014 growing season, we examined eapp in the five deciduous angiosperm tree species (Prunus serotina, Acer saccharinum, Quercus rubra, Quercus alba, and Ulmus americana) that dominate the temperate forest at Brown’s Lake Bog, Ohio, USA. We sampled individuals of each species at weekly to monthly intervals from March to October and report δD values of n-C29 alkanes (δDn-C29 alkane) and n-C28 alkanoic acids (δDn-C28 acid), as well as xylem (δDxw) and leaf water (δDlw). n-Alkane synthesis was most intense 2–3 weeks after leaf emergence and ceased thereafter, whereas n-alkanoic acid synthesis continued throughout the entire growing season. During bud swell and leaf emergence, δDlw was a primary control on δDn-C29 alkane and δDn-C28 acid values, which stabilized once leaves became fully expanded. Metabolic shifts between young and mature leaves may be an important secondary driver of δDwax changes during leaf development. In mature autumn leaves of all species, the mean eapp for n-C29 alkane (−107‰) was offset by approximately −19‰ from the mean eapp for n-C28 alkanoic acid (−88‰). These results indicate that in temperate settings n-alkanes and n-alkanoic acids from deciduous trees are distinct with respect to their abundance, timing of synthesis, and eapp values." @default.
- W2593526045 created "2017-03-16" @default.
- W2593526045 creator A5053601893 @default.
- W2593526045 creator A5063016999 @default.
- W2593526045 creator A5065682566 @default.
- W2593526045 date "2017-06-01" @default.
- W2593526045 modified "2023-10-12" @default.
- W2593526045 title "Hydrogen isotopes of n-alkanes and n-alkanoic acids as tracers of precipitation in a temperate forest and implications for paleorecords" @default.
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- W2593526045 doi "https://doi.org/10.1016/j.gca.2017.02.027" @default.
- W2593526045 hasPublicationYear "2017" @default.
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