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Long and Short-Term Effects of Fire on Soil Charcoal of a Conifer Forest in Southwest Oregon

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https://ir.library.oregonstate.edu/concern/articles/5425kb36q

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  • In 2002, the Biscuit Wildfire burned a portion of the previously established, replicated conifer unthinned and thinned experimental units of the Siskiyou Long-Term Ecosystem Productivity (LTEP) experiment, southwest Oregon. Charcoal C in pre and post-fire O horizon and mineral soil was quantified by physical separation and a peroxide-acid digestion method. The abrupt, short-term fire event caused O horizon charcoal C to increase by a factor of ten to >200 kg C ha⁻¹. The thinned wildfire treatment produced less charcoal C than unthinned wildfire and thinned prescribed fire treatments. The charcoal formation rate was 1 to 8% of woody fuels consumed, and this percentage was negatively related to woody fuels consumed, resulting in less charcoal formation with greater fire severity. Charcoal C averaged 2000 kg ha⁻¹ in 0–3 cm mineral soil and may have decreased as a result of fire, coincident with convective or erosive loss of mineral soil. Charcoal C in 3–15 cm mineral soil was stable at 5500 kg C ha⁻¹. Long-term soil C sequestration in the Siskiyou LTEP soils is greatly influenced by the contribution of charcoal C, which makes up 20% of mineral soil organic C. This research reiterates the importance of fire to soil C in a southwestern Oregon coniferous forest ecosystem.
  • Keywords: Soil carbon, Soil change, Wildfire, Pre- and post-fire measurement, Black carbon, Biscuit Wildfire, Charcoal, Peroxide-acid digestion
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  • Pingree, M., Homann, P., Morrissette, B., & Darbyshire, R. (2012). Long and short-term effects of fire on soil charcoal of a conifer forest in southwest oregon. Forests, 3(2), 353-369. doi: 10.3390/f3020353
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  • 3
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  • 2
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  • This study was funded partially by the Fund for the Enhancement of Graduate Research awarded by the Western Washington University Vice-Provost for Research, the Huxley College Small Grants for Graduate Research and the aid given by the Biogeochemical Initiative. This work was also supported by the Long-term Ecosystem Productivity Study, USDA Pacific-Northwest Research Station, Corvallis, OR and USDA/USDI Joint Fire Science Program, Grant 10-1-10-18.
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