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| Titel |
Distribution of black carbon in ponderosa pine forest floor and soils following the High Park wildfire |
| VerfasserIn |
C. M. Boot, M. Haddix, K. Paustian, M. F. Cotrufo |
| 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. 10 ; Nr. 12, no. 10 (2015-05-22), S.3029-3039 |
| Datensatznummer |
250117945
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| Publikation (Nr.) |
 copernicus.org/bg-12-3029-2015.pdf |
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| Zusammenfassung |
| Biomass burning produces black carbon (BC), effectively transferring a
fraction of the biomass C from an actively cycling pool to a passive C pool,
which may be stored in the soil. Yet the timescales and mechanisms for
incorporation of BC into the soil profile are not well understood. The High
Park fire (HPF), which occurred in northwestern Colorado in the summer of
2012, provided an opportunity to study the effects of both fire severity and
geomorphology on properties of carbon (C), nitrogen (N) and BC in the Cache
La Poudre River drainage. We sampled montane ponderosa pine forest floor (litter plus O-horizon) and soils at 0–5 and 5–15 cm depth 4 months post-fire in order to examine
the effects of slope and burn severity on %C, C stocks, %N and BC. We
used the benzene polycarboxylic acid (BPCA) method for quantifying BC. With
regard to slope, we found that steeper slopes had higher C : N than shallow
slopes but that there was no difference in BPCA-C content or stocks. BC
content was greatest in the forest floor at burned sites (19 g BPCA-C kg−1 C), while BC stocks were greatest in the 5–15 cm subsurface soils
(23 g BPCA-C m−2). At the time of sampling, unburned and burned soils
had equivalent BC content, indicating none of the BC deposited on the land
surface post-fire had been incorporated into either the 0–5 or 5–15 cm
soil layers. The ratio of B6CA : total BPCAs, an index of the degree of
aromatic C condensation, suggested that BC in the 5–15 cm soil layer may
have been formed at higher temperatures or experienced selective degradation relative to the forest floor and 0–5 cm
soils. Total BC soil stocks were relatively low compared to other fire-prone
grassland and boreal forest systems, indicating most of the BC produced in
this system is likely lost, either through erosion events, degradation or
translocation to deeper soils. Future work examining mechanisms for BC
losses from forest soils will be required for understanding the role BC
plays in the global carbon cycle. |
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