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| Titel |
Turnover of new soil carbon inputs under increased atmospheric CO2: synthesizing the isotopic evidence |
| VerfasserIn |
Kees Jan van Groenigen, Craig W. Osenberg, César Terrer, Yolima Carrillo, Feike Dijkstra, James Heath, Ming Nie, Elise Pendall, Richard P. Phillips, Bruce A. Hungate |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250154248
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| Publikation (Nr.) |
 EGU/EGU2017-19319.pdf |
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| Zusammenfassung |
| Rising levels of atmospheric CO2 often stimulate plant inputs to soil, but the effect of these changes on soil carbon (C) dynamics are poorly understood. Plant-derived inputs can accumulate in the soil and become part of the soil C pool (“new soil C”), or accelerate losses of pre-existing ("old") soil C. The dynamics of the new vs. old pools will likely differ and alter the long-term fate of soil C, but these separate pools, which can be distinguished through isotopic labeling, have not been considered in past syntheses. Using meta-analysis, we found that while elevated CO2 stimulates the accumulation of new soil C in the short term (< 1 year), these effects do not persist in the long term (> 1 year). Our results are inconsistent with predictions of conventional soil C models and suggest an increase in turnover rates of new soil C under elevated CO2. |
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