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- W3129120612 abstract "Plant waxes, including n-alkanes, are commonly used for a wide range of paleo-applications. Several common traits of n-alkanes that are used as paleo-proxies include chain length distribution and average chain length (ACL), as well as plant wax carbon and hydrogen isotopic compositions. The effect of climate on plant wax traits has been the subject of many studies, but a common challenge with modern calibrations is disentangling the effects of species (genetic), temperature, and precipitation from one another. Here, we explore the effect of temperature and drought, independently and combined, on plant wax composition of the species Juniper monosperma in a large ecosystem-scale field manipulation experiment. We find that n-alkane concentrations significantly increase with temperature, but other parameters (including ACL) are not affected. These results support physiological studies that identify n-alkanes as an important barrier to water loss within the plant cuticle. Combined with prior studies, it appears that changes in ACL within sediments are likely controlled by changes in species composition rather than directly by changes in climate. We find little variation in the carbon isotopic composition (δ13C) of n-alkanes across the treatments whereas bulk leaf δ13C values are higher in the heat and drought treatment. Because leaf δ13C values represent a weighted C assimilation signal, these values reflect differences in leaf gas exchange among treatments, whereas the n-alkanes are synthesized when water availability is higher and differences among treatments are not significant enough to influence their values. These results have important implications for using n-alkane traits, including ACL and δ13C values, for paleoenvironmental reconstructions." @default.
- W3129120612 created "2021-02-15" @default.
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- W3129120612 date "2021-03-01" @default.
- W3129120612 modified "2023-10-06" @default.
- W3129120612 title "Plant wax and carbon isotope response to heat and drought in the conifer Juniperus monosperma" @default.
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- W3129120612 doi "https://doi.org/10.1016/j.orggeochem.2021.104197" @default.
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