Biochar properties and impact on soil CO2 and N2O emissions

dc.contributor.advisor David A. Laird Fidel, Rivka
dc.contributor.department Agronomy 2020-01-25T00:18:51.000 2020-06-30T02:59:21Z 2020-06-30T02:59:21Z Thu Jan 01 00:00:00 UTC 2015 2001-01-01 2015-01-01
dc.description.abstract <p>Biochar application to soil has been proposed as a means to sequester carbon and mitigate anthropogenic greenhouse gas (GHG) emissions. However, biochar directly influences soil GHG emissions in a complex-interactive manner that remains poorly understood, and hence further understanding of biochar-soil interactions is needed to evaluate biochar’s efficacy as a tool for greenhouse gas mitigation. The goals of this dissertation are to (1) quantify the organic and inorganic alkalis of several biochars, (2) quantify the impact of biochar properties on GHG emissions from diverse soils, and (3) identify mechanisms by which biochar properties influence GHG emissions from soils. To achieve these goals, biochar alkalis and thermochemical properties were analyzed, and three laboratory incubations as well as two field studies and one greenhouse study were conducted, employing eight biochars, two field sites, and four cropping systems. It was found that biochar properties are highly diverse, and effects on GHG emissions varied with respect to biochar properties and soil properties. Both carbonates and bicarbonate-extractable organic carbon in biochar contributed directly to very short term CO2 emissions but did not influence N2O emissions. Effects of biochar on N2O emissions were found to be more complex, with biochar increasing, decreasing or not affecting emissions depending on the context. Results highlight perturbation of N transformations, direct sorption of N, and enhanced water retention as potential mechanisms of biochar’s influence on N2O emissions and suggest that multiple mechanisms likely operate simultaneously.</p>
dc.format.mimetype application/pdf
dc.identifier archive/
dc.identifier.articleid 5819
dc.identifier.contextkey 8330825
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/14812
dc.language.iso en
dc.source.bitstream archive/|||Fri Jan 14 20:27:06 UTC 2022
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Chemistry
dc.subject.disciplines Environmental Sciences
dc.subject.keywords Soil Science (Soil Chemistry)
dc.subject.keywords Soil Science
dc.subject.keywords Soil Chemistry
dc.subject.keywords alkalinity
dc.subject.keywords biochar
dc.subject.keywords carbon dioxide
dc.subject.keywords greenhouse gas
dc.subject.keywords nitrous oxide
dc.subject.keywords soil
dc.title Biochar properties and impact on soil CO2 and N2O emissions
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a dissertation Doctor of Philosophy
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