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| Titel |
Paleovegetation reconstruction using δ13C of Soil Organic Matter |
| VerfasserIn |
G. Wang, X. Feng, J. Han, L. Zhou, W. Tan, F. Su |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 5, no. 5 ; Nr. 5, no. 5 (2008-09-18), S.1325-1337 |
| Datensatznummer |
250002829
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| Publikation (Nr.) |
 copernicus.org/bg-5-1325-2008.pdf |
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| Zusammenfassung |
| The relative contributions of C3 and C4 plants to vegetation at a
given locality may be estimated by means of δ13C of soil organic matter.
This approach holds a great potential for paleoecological reconstruction
using paleosols. However, two main uncertainties exist, which limits the
accuracy of this application. One is δ13C-enrichment as the plant carbon
becomes incorporated into soil organic matter. The other is due to
environmental influences on δ13C of plants. Two types of data were
collected and analyzed with an objective of narrowing the error of
paleovegetation reconstruction. First, we investigated δ13C variations
of 557 C3 and 136 C4 plants along a precipitation gradient in
North China. A strong negative correlation is found between the δ13C
value of C3 plants averaged for each site and the annual precipitation
with a coefficient of −0.40‰/100mm, while no significant coefficients were
found for C4 plants. Second, we measured δ13C of soil organic
matters for 14 soil profiles at three sites. The isotopic difference between
vegetation and soil organic matter are evaluated to be 1.8‰ for the surface
soil and 2.8‰ for the soil at the bottom of soil profiles. We conducted a
sample reconstruction of paleovegetation at the central Chinese Loess
Plateau during the Holocene and the Last Glacial (LG), and conclude that,
without corrections for δ13C-enrichment by decomposition, the C4
abundance would be overestimated. The importance and uncertainties of other
corrections are also discussed. |
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