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| Titel |
Seasonal variations in carbon dioxide exchange in an alpine wetland meadow on the Qinghai-Tibetan Plateau |
| VerfasserIn |
L. Zhao, J. Li, S. Xu, H. Zhou, Y. Li, S. Gu, X. Zhao |
| 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 ; 7, no. 4 ; Nr. 7, no. 4 (2010-04-06), S.1207-1221 |
| Datensatznummer |
250004661
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| Publikation (Nr.) |
 copernicus.org/bg-7-1207-2010.pdf |
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| Zusammenfassung |
| Alpine wetland meadow could functions as a carbon sink due to it high soil
organic content and low decomposition. However, the magnitude and dynamics
of carbon stock in alpine wetland ecosystems are not well quantified.
Therefore, understanding how environmental variables affect the processes
that regulate carbon fluxes in alpine wetland meadow on the Qinghai-Tibetan
Plateau is critical. To address this issue, Gross Primary Production
(GPP), Ecosystem Respiration (Reco), and Net Ecosystem Exchange (NEE) were
examined in an alpine wetland meadow using the eddy covariance method from
October 2003 to December 2006 at the Haibei Research Station of the Chinese
Academy of Sciences. Seasonal patterns of GPP and Reco were closely
associated with leaf area index (LAI). The Reco showed a positive
exponential to soil temperature and relatively low Reco occurred during
the non-growing season after a rain event. This result is inconsistent with
the result observed in alpine shrubland meadow. In total, annual GPP were
estimated at 575.7, 682.9, and 630.97 g C m−2 in 2004, 2005, and 2006,
respectively. Meanwhile, the Reco were equal to 676.8, 726.4, 808.2 g C m−2,
and thus the NEE were 101.1, 44.0 and 173.2 g C m−2. These
results indicated that the alpine wetland meadow was a moderately source of
carbon dioxide (CO2). The observed carbon dioxide fluxes in the alpine
wetland meadow were higher than other alpine meadow such as Kobresia humilis meadow and
shrubland meadow. |
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