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TitleInsight into the effects of biochar on manure composting: Evidence supporting the relationship between N2O emission and denitrifying community
Publication TypeJournal Article
Year of Publication2013
AuthorsWang, C., Lu H., Dong D., Deng H., Strong P.J., Wang H., and Wu W.
JournalEnvironmental Science and Technology
Pagination7341 - 7349
Date Published2013
ISSN0013936X (ISSN)
KeywordsAnalytical results, Animals, article, Bacteria, Biochar amendments, Charcoal, community structure, compost, composting, controlled study, Denitrification, Denitrifying bacteria, denitrifying bacterium, DNA, Bacterial, emission control, Gene Dosage, Genes, Genes, Bacterial, greenhouse gas, Greenhouse gas mitigation, Greenhouse gases, Inter-relationships, manure, Manure composting, Moisture, moisture content, Nitrate Reductase, nitrogen dioxide, Nitrogen oxides, nitrous oxide, nitrous oxide emission, pH, Practical method, sawdust, Soil, Spearman rank correlation, Swine, Temperature, Wood, wood chip, Wood products
AbstractAlthough nitrous oxide (N2O) emissions from composting contribute to the accelerated greenhouse effect, it is difficult to implement practical methods to mitigate these emissions. In this study, the effects of biochar amendment during pig manure composting were investigated to evaluate the inter-relationships between N2O emission and the abundance of denitrifying bacteria. Analytical results from two pilot composting treatments with (PWSB, pig manure + wood chips + sawdust + biochar) or without (PWS, pig manure + wood chips + sawdust) biochar (3% w/w) demonstrated that biochar amendment not only lowered NO2 --N concentrations but also lowered the total N2O emissions from pig manure composting, especially during the later stages. Quantification of functional genes involved in denitrification and Spearman rank correlations matrix revealed that the N2O emission rates correlated with the abundance of nosZ, nirK, and nirS genes. Biochar-amended pig manure had a higher pH and a lower moisture content. Biochar amendment altered the abundance of denitrifying bacteria significantly; less N2O-producing and more N2O-consuming bacteria were present in the PWSB, and this significantly lowered N2O emissions in the maturation phase. Together, the results demonstrate that biochar amendment could be a novel greenhouse gas mitigation strategy during pig manure composting. © 2013 American Chemical Society.

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