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Carbon isotope compositions of terrestrial C3 plants as indicators of (paleo)ecology and (paleo)climate

Open access
Kohn, Matthew J.·2010·Proceedings of the National Academy of Sciences

Abstract

A broad compilation of modern carbon isotope compositions in all C3 plant types shows a monotonic increase in δ13 C with decreasing mean annual precipitation (MAP) that differs from previous models. Corrections for temperature, altitude, or latitude are smaller than previously estimated. As corrected for altitude, latitude, and the δ13 C of atmospheric CO 2, these data permit refined interpretation of MAP, paleodiet, and paleoecology of ecosystems dominated by C3 plants, either prior to 7–8 million years ago (Ma), or more recently at mid- to high latitudes. Twenty-nine published paleontological studies suggest preservational or scientific bias toward dry ecosystems, although wet ecosystems are also represented. Unambiguous isotopic evidence for C4 plants is lacking prior to 7–8 Ma, and hominid ecosystems at 4.4 Ma show no isotopic evidence for dense forests. Consideration of global plant biomass indicates that average δ13 C of C3 plants is commonly overestimated by approximately 2‰.

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Metadata

Authors
Kohn, M. J.
Venue
Proceedings of the National Academy of Sciences
Published
2010-11
Volume
107
Issue
46
Pages
19691-19695
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2106990564
Cited by
1,449
References
4
FWCI
19.51
Type
journal article
Language
en
Open access
bronze

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Kohn, M. J. (2010). Carbon isotope compositions of terrestrial C3 plants as indicators of (paleo)ecology and (paleo)climate. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1004933107

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