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Physical, Chemical and Biological Characterization of Six Biochars Produced for the Remediation of Contaminated Sites
Published on: November 28, 2014
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Carbon sequestration potential and physicochemical properties differ between wildfire charcoals and slow-pyrolysis
Cristina Santín1,2, Stefan H Doerr3, Agustin Merino4
1Department of Geography, College of Science, Swansea University, Singleton Park, Swansea, SA2 8PP, UK. c.santin@swansea.ac.uk.
Scientific Reports
|September 13, 2017
Summary
Natural charcoal and biochar are often compared, but this study shows their distinct properties limit direct comparability. Wildfire charcoals have lower carbon sequestration potential than biochar, challenging assumptions in climate and agronomy research.
Area of Science:
- Environmental Science
- Biogeochemistry
- Soil Science
Background:
- Pyrogenic carbon (PyC), encompassing natural charcoal and anthropogenic biochar, is crucial for climate dynamics, agronomy, and paleosciences.
- Charcoal and biochar are frequently used as proxies to estimate carbon sequestration, production conditions, and environmental impacts.
- Direct comparison of physicochemical properties and carbon sequestration potential between natural and anthropogenic PyC remains largely untested.
Purpose of the Study:
- To compare the physicochemical properties and carbon sequestration potentials of PyC derived from identical feedstocks under wildfire charring and slow-pyrolysis conditions.
- To evaluate the validity of using natural charcoal as a proxy for biochar, and vice versa, in scientific research.
Main Methods:
- Comparison of key physicochemical properties: elemental composition, δ13C and PAH signatures, chemical recalcitrance, density, and porosity.
- Analysis of PyC materials produced from identical pine forest floor and wood feedstocks under contrasting charring conditions (wildfire vs. slow pyrolysis).
Main Results:
- Wildfire charcoals formed under higher temperatures and oxygen but shorter durations than slow-pyrolysis biochars.
- Significant differences in physicochemical properties were observed between wildfire charcoals and biochars.
- Wildfire charcoals exhibited lower carbon sequestration potentials compared to most slow-pyrolysis biochars, even those formed at higher temperatures.
Conclusions:
- Natural charcoal and biochar are not direct analogues due to distinct formation conditions and resulting properties.
- The common practice of using charcoal as a proxy for biochar may lead to underestimation of biochar's environmental residence time and vice versa.
- Findings necessitate a re-evaluation of proxy assumptions in studies concerning PyC's role in carbon cycling and environmental fate.
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