A multi-century δ 13 C record of the C 4 grass Setaria macrostachya in the US Southwest: Identifying environmental causes of variability
AffiliationUniv Arizona, Geosci Dept
Univ Arizona, NSF Arizona Accelerator Facil
MetadataShow full item record
PublisherELSEVIER SCIENCE BV
CitationEastoe, C., & Toolin, L. (2018). A multi-century δ13C record of the C4 grass Setaria macrostachya in the US Southwest: Identifying environmental causes of variability. Palaeogeography, Palaeoclimatology, Palaeoecology, 489, 129-136.
Rights© 2017 Elsevier B.V. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractAnnual and 5-year averages of delta C-13 measured on florets of the C-4 grass Setaria macrostachya decreased from -10 to -13 parts per thousand between 1849 and 2016. Atmosphere-plant delta C-13 discrimination (A) changed from 3 to 4 early in this interval, to 4-5 since 1970. These century-scale changes result from decrease in atmospheric delta C-13 and, prior to 1970, from changes in A related to increase in the partial pressure of CO2 in the atmosphere, both largely caused by the burning of fossil fuels. Short-term fluctuations (interannual to decadal) in slope of the time series of averaged delta C-13 do not result from natural causes, but in certain cases appear to coincide with human economic activities. Annual delta C-13 ranges in years with sufficient measurements are consistently about 2 parts per thousand. It is unlikely that useful information on past atmospheric delta C-13 will be obtained from S. macrostachya seeds preserved in packrat middens or other archives.
Note24 month embargo; published online: 13 October 2017
VersionFinal accepted manuscript