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| Titel |
Carbon isotope discrimination of C3 vegetation in Central Asian grassland as related to long-term and short-term precipitation patterns |
| VerfasserIn |
M. H. O. M. Wittmer, K. Auerswald, R. Tungalag, Y. F. Bai, R. Schäufele, H. Schnyder |
| 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. 3 ; Nr. 5, no. 3 (2008-06-11), S.913-924 |
| Datensatznummer |
250002530
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| Publikation (Nr.) |
 copernicus.org/bg-5-913-2008.pdf |
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| Zusammenfassung |
| The relationship between carbon isotope discrimination (13Δ) of C3
vegetation and long-term (30 years) and short-term (growing period)
precipitation was investigated. Different species of Stipa, a
dominant grass genus in the (semi-)arid Asian steppes, and other C3 species
were collected along aridity gradients in Inner Mongolia in 2005 (11 sites,
71 samples) and in the Republic of Mongolia in 2006 (40 sites, 45 samples).
The data set was expanded with published and unpublished data of
Stipa and other C3 species (11 studies covering 8 years, including
64 observations of Stipa, and 103 observations of other C3 species)
and C3 community bulk-samples (11 samples). Weather data were
geostatistically interpolated for all sampling sites and years. 13Δ
of Stipa followed different relationships for the individual years
when related to mean annual precipitation due to large anomalies between
annual and long-term average precipitation patterns. However, the
13Δ response to rainfall converged when the (long-term) mean
annual precipitation was replaced by year-specific mean daily precipitation
during the growing period (PG). Remarkably, the 13Δ-response to (PG) for C3 species as a whole (including herbaceous
dicots, semi-shrubs and grasses) and also the C3 community-level response
were virtually identical to that of Stipa. The relation was also
valid outside the geographical and climatic range where it was developed,
giving proof of its robustness. |
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