期刊
BIOGEOCHEMISTRY
卷 100, 期 1-3, 页码 39-56出版社
SPRINGER
DOI: 10.1007/s10533-009-9403-z
关键词
Alkyl carbon; Aromatic carbon; Black carbon; Black spruce; Boreal forest; Carbon balance; Charcoal; Fire; Organic soil; Protein; Soil
资金
- NSF [DEB-0423442]
- USDA Forest Service, Pacific Northwest Research Station [PNW01-JV11261952-231]
- Rice University
- Keith-Weiss postdoctoral fellowship
- Center for Water Sciences at Michigan State University
- Division Of Environmental Biology
- Direct For Biological Sciences [830997] Funding Source: National Science Foundation
- Office of Polar Programs (OPP)
- Directorate For Geosciences [0909310] Funding Source: National Science Foundation
There is still much uncertainty as to how wildfire affects the accumulation of burn residues (such as black carbon (BC)) in the soil, and the corresponding changes in soil organic carbon (SOC) composition in boreal forests. We investigated SOC and BC composition in black spruce forests on different landscape positions in Alaska, USA. Mean BC stocks in surface mineral soils (0.34 +/- A 0.09 kg C m(-2)) were higher than in organic soils (0.17 +/- A 0.07 kg C m(-2)), as determined at four sites by three different C-13 Nuclear Magnetic Resonance Spectroscopy-based techniques. Aromatic carbon, protein, BC, and the alkyl:O-alkyl carbon ratio were higher in mineral soil than in organic soil horizons. There was no trend between mineral soil BC stocks and fire frequencies estimated from lake sediment records at four sites, and soil BC was relatively modern (< 54-400 years, based on mean Delta C-14 ranging from 95.1 to -54.7aEuro degrees). A more extensive analysis (90 soil profiles) of mineral soil BC revealed that interactions among landscape position, organic layer depth, and bulk density explained most of the variance in soil BC across sites, with less soil BC occurring in relatively cold forests with deeper organic layers. We suggest that shallower organic layer depths and higher bulk densities found in warmer boreal forests are more favorable for BC production in wildfire, and more BC is integrated with mineral soil than organic horizons. Soil BC content likely reflected more recent burning conditions influenced by topography, and implications of this for SOC composition (e.g., aromaticity and protein content) are discussed.
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