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| Titel |
Soil moisture influence on the interannual variation in temperature sensitivity of soil organic carbon mineralization in the Loess Plateau |
| VerfasserIn |
Y. J Zhang, S. L. Guo, M. Zhao, L. L. Du, R. J. Li, J. S. Jiang, R. Wang, N. N. Li |
| 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 ; 12, no. 11 ; Nr. 12, no. 11 (2015-06-12), S.3655-3664 |
| Datensatznummer |
250117985
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| Publikation (Nr.) |
 copernicus.org/bg-12-3655-2015.pdf |
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| Zusammenfassung |
| Temperature sensitivity of soil organic carbon (SOC) mineralization (i.e.,
Q10) determines how strong the feedback from global warming may be on
the atmospheric CO2 concentration; thus, understanding the factors
influencing the interannual variation in Q10 is important for
accurately estimating local soil carbon cycle. In situ SOC mineralization rate was
measured using an automated CO2 flux system (Li-8100) in long-term
bare fallow soil in the Loess Plateau (35°12' N,
107°40' E) in Changwu, Shaanxi, China from 2008 to 2013.
The results showed that the annual cumulative SOC mineralization ranged from
226 to 298 g C m−2 yr−1, with a mean of 253 g C m−2 yr−1
and a coefficient of variation (CV) of 13%, annual Q10 ranged from 1.48 to 1.94, with a mean
of 1.70 and a CV of 10%, and annual soil moisture content ranged from
38.6 to 50.7% soil water-filled pore space (WFPS), with a mean of
43.8% WFPS and a CV of 11%, which were mainly affected by the
frequency and distribution of precipitation. Annual Q10 showed
a quadratic correlation with annual mean soil moisture content. In
conclusion, understanding of the relationships between interannual variation
in Q10, soil moisture, and precipitation are important to accurately
estimate the local carbon cycle, especially under the changing climate. |
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