Paper: “Long-Term Impacts of Manure Amendments on Carbon and Greenhouse Gas Dynamics of Rangelands,” Global Change Biology (2015), doi: 10.1111/gcb.13044
Research Team: Justine J. Owen, Whendee L. Silver, William J. Parton (Department of Environmental Science, Policy, and Management, University of California at Berkeley, and Natural Resource Ecology Laboratory, Colorado State University, Fort Collins)
Findings: Here we explored the long-term implications of manure amendments to rangeland soils. We used data from amended and unamended fields in California to parameterize the DayCent Model to estimate C, nitrogen, and greenhouse gas fluxes. While manure amendments do increase C storage in soils, over time C gains are completely offset by N2O.
Paper: “Greenhouse Gas Emissions from Dairy Manure Management: A Review of Field-Based Studies” Global Change Biology (2014), doi: 10.1111/gcb.12687
Research Team: Justine J. Owen and Whendee L. Silver (Ecosystem Science Division, Department of Environment Science, Policy, and Management, University of California at Berkeley)
Findings: In this paper, we conducted a meta-analysis on literature regarding global dairy manure emissions and used the results to update the IPCC Tier 2 model for dairy manure emissions. Results showed that the current models underestimate CH4 and N2O from dairy manure management and allowed us to identify gaps in knowledge and opportunities for emissions reduction.
Paper: Greenhouse Gas Mitigation Opportunities in California Agriculture Review of Emissions and Mitigation Potential of Animal Manure Management and Land Application of Manure Nicholas Institute for Environmental Policy Solutions, February 2014
Research Team: Justine J. Owen, Ermias Kebreab, and Whendee Silver University of California at Berkeley
Findings: Like the above paper we conducted a meta-analysis on literature regarding California dairy manure emissions and used the results to update the IPCC Tier 2 model for dairy manure emissions. This exercise allowed us to identify strategic areas for better manure management that would reduce emissions and enhance compost supply in the state.