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| Titel |
Amplification and dampening of soil respiration by changes in temperature variability |
| VerfasserIn |
C. A. Sierra, M. E. Harmon, E. Thomann, S. S. Perakis, H. W. Loescher |
| 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 ; 8, no. 4 ; Nr. 8, no. 4 (2011-04-19), S.951-961 |
| Datensatznummer |
250005695
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| Publikation (Nr.) |
 copernicus.org/bg-8-951-2011.pdf |
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| Zusammenfassung |
| Accelerated release of carbon from soils is one of the most important
feedbacks related to anthropogenically induced climate change. Studies
addressing the mechanisms for soil carbon release through organic matter
decomposition have focused on the effect of changes in the average
temperature, with little attention to changes in temperature variability.
Anthropogenic activities are likely to modify both the average state and the
variability of the climatic system; therefore, the effects of future warming
on decomposition should not only focus on trends in the average temperature,
but also variability expressed as a change of the probability distribution of
temperature. Using analytical and numerical analyses we tested common
relationships between temperature and respiration and found that the
variability of temperature plays an important role determining respiration
rates of soil organic matter. Changes in temperature variability, without
changes in the average temperature, can affect the amount of carbon released
through respiration over the long-term. Furthermore, simultaneous changes in
the average and variance of temperature can either amplify or dampen the
release of carbon through soil respiration as climate regimes change. These
effects depend on the degree of convexity of the relationship between
temperature and respiration and the magnitude of the change in temperature
variance. A potential consequence of this effect of variability would be
higher respiration in regions where both the mean and variance of temperature
are expected to increase, such as in some low latitude regions; and lower
amounts of respiration where the average temperature is expected to increase
and the variance to decrease, such as in northern high latitudes. |
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