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| Titel |
Aeolian nutrient fluxes following wildfire in sagebrush steppe: implications for soil carbon storage |
| VerfasserIn |
N. J. Hasselquist, M. J. Germino, J. B. Sankey, L. J. Ingram, N. F. Glenn |
| 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. 12 ; Nr. 8, no. 12 (2011-12-14), S.3649-3659 |
| Datensatznummer |
250006246
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| Publikation (Nr.) |
 copernicus.org/bg-8-3649-2011.pdf |
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| Zusammenfassung |
| Pulses of aeolian transport following fire can profoundly affect the
biogeochemical cycling of nutrients in semi-arid and arid ecosystems. Our
objective was to determine horizontal nutrient fluxes occurring in the
saltation zone during an episodic pulse of aeolian transport that occurred
following a wildfire in a semi-arid sagebrush steppe ecosystem in southern
Idaho, USA. We also examined how temporal trends in nutrient fluxes were
affected by changes in particle sizes of eroded mass as well as nutrient
concentrations associated with different particle size classes. In the
burned area, total carbon (C) and nitrogen (N) fluxes were as high as 235 g
C m−1 d−1 and 19 g N m−1 d−1 during the first few months
following fire, whereas C and N fluxes were negligible in an adjacent
unburned area throughout the study. Temporal variation in C and N fluxes
following fire was largely attributable to the redistribution of
saltation-sized particles. Total N and organic C concentrations in the soil
surface were significantly lower in the burned relative to the unburned area
one year after fire. Our results show how an episodic pulse of aeolian
transport following fire can affect the spatial distribution of soil C and
N, which, in turn, can have important implications for soil C storage. These
findings demonstrate how an ecological disturbance can exacerbate a
geomorphic process and highlight the need for further research to better
understand the role aeolian transport plays in the biogeochemical cycling of
C and N in recently burned landscapes. |
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