Experimental Open Air Burning of Vegetation Enhances Organic Matter Chemical Heterogeneity Compared to Laboratory Burns.

Autor:	Myers-Pigg AN; Marine and Coastal Research Laboratory, Pacific Northwest National Laboratory, Sequim, Washington 98382, United States.; Department of Environmental Sciences, University of Toledo, Toledo, Ohio 43606, United States., Grieger S; Marine and Coastal Research Laboratory, Pacific Northwest National Laboratory, Sequim, Washington 98382, United States., Roebuck JA Jr; Marine and Coastal Research Laboratory, Pacific Northwest National Laboratory, Sequim, Washington 98382, United States., Barnes ME; Pacific Northwest National Laboratory, Richland, Washington 99354, United States., Bladon KD; Department of Forest Ecosystems and Society, Oregon State University, Corvallis, Oregon 97331, United States.; Department of Forest Engineering, Resources and Management, Oregon State University, Corvallis, Oregon 97331, United States., Bailey JD; Department of Forest Engineering, Resources and Management, Oregon State University, Corvallis, Oregon 97331, United States., Barton R; Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, New York 12180, United States.; Center for Environmental and Stable Isotope Analysis, Rensselaer Polytechnic Institute, Troy, New York 12180, United States., Chu RK; Environmental Molecular Science Laboratory, Richland, Washington 99354, United States., Graham EB; Pacific Northwest National Laboratory, Richland, Washington 99354, United States.; School of Biological Sciences, Washington State University, Pullman, Washington 99164, United States., Homolka KK; Marine and Coastal Research Laboratory, Pacific Northwest National Laboratory, Sequim, Washington 98382, United States., Kew W; Environmental Molecular Science Laboratory, Richland, Washington 99354, United States., Lipton AS; Environmental Molecular Science Laboratory, Richland, Washington 99354, United States., Scheibe T; Pacific Northwest National Laboratory, Richland, Washington 99354, United States., Toyoda JG; Environmental Molecular Science Laboratory, Richland, Washington 99354, United States., Wagner S; Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, New York 12180, United States.; Center for Environmental and Stable Isotope Analysis, Rensselaer Polytechnic Institute, Troy, New York 12180, United States.
Jazyk:	angličtina
Zdroj:	Environmental science & technology [Environ Sci Technol] 2024 Jun 04; Vol. 58 (22), pp. 9679-9688. Date of Electronic Publication: 2024 May 22.
DOI:	10.1021/acs.est.3c10826
Abstrakt:	Wildfires produce solid residuals that have unique chemical and physical properties compared to unburned materials, which influence their cycling and fate in the natural environment. Visual burn severity assessment is used to evaluate post-fire alterations to the landscape in field-based studies, yet muffle furnace methods are commonly used in laboratory studies to assess molecular scale alterations along a temperature continuum. Here, we examined solid and leachable organic matter characteristics from chars visually characterized as low burn severity that were created either on an open air burn table or from low-temperature muffle furnace burns. We assessed how the different combustion conditions influence solid and dissolved organic matter chemistries and explored the potential influence of these results on the environmental fate and reactivity. Notably, muffle furnace chars produced less leachable carbon and nitrogen than open air chars across land cover types. Organic matter produced from muffle furnace burns was more homogeneous than open air chars. This work highlights chemical heterogeneities that exist within a single burn severity category, potentially influencing our conceptual understanding of pyrogenic organic matter cycling in the natural environment, including transport and processing in watersheds. Therefore, we suggest that open air burn studies are needed to further advance our understanding of pyrogenic organic matter's environmental reactivity and fate.
Databáze:	MEDLINE
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