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| Titel |
Effects of elevated CO2 and N fertilization on plant and soil carbon pools of managed grasslands: a meta-analysis |
| VerfasserIn |
W. M. A. Sillen, W. I. J. Dieleman |
| 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 ; 9, no. 6 ; Nr. 9, no. 6 (2012-06-22), S.2247-2258 |
| Datensatznummer |
250007128
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| Publikation (Nr.) |
 copernicus.org/bg-9-2247-2012.pdf |
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| Zusammenfassung |
| Elevated atmospheric CO2 levels and increasing nitrogen deposition both
stimulate plant production in terrestrial ecosystems. Moreover, nitrogen
deposition could alleviate an increasing nitrogen limitation experienced by
plants exposed to elevated CO2 concentrations. However, an increased
rate of C flux through the soil compartment as a consequence of elevated
CO2 concentrations has been suggested to limit C sequestration in
terrestrial ecosystems, questioning the potential for terrestrial C uptake
to mitigate increasing atmospheric CO2 concentrations. Our study used
data from 77 published studies applying elevated CO2 and/or N
fertilization treatment to monitor carbon storage potential in grasslands,
and considered the influence of management practices involving biomass
removal or irrigation on the elevated CO2 effects. Our results
confirmed a positive effect of elevated CO2 levels and nitrogen
fertilization on plant growth, but revealed that N availability is essential
for the increased C influx under elevated CO2 to propagate into
belowground C pools. However, moderate nutrient additions also promoted
decomposition processes in elevated CO2, reducing the potential for
increased soil C storage. An important role was attributed to the CO2
response of root biomass in soil carbon responses to elevated CO2,
since there was a lower potential for increases in soil C content when root
biomass increased. Future elevated CO2 concentrations and increasing N
deposition might thus increase C storage in plant biomass, but the potential
for increased soil C storage is limited. |
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