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Title:   Author  item
                                            Jin, Virginiaitem
                                            Baker, Johnitem
                                            Johnson, Janeitem
                                            Lehman, R

                                                         - *Michael*item
                                            Osborne, Shannonitem
                                            Sauer, Thomasitem
                                            Stott, Dianeitem
                                            Varvel, Garyitem
                                            Venterea, Rodney

                                                         - *Rod*
  Submitted to: Sungrant Initiative
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 6/11/2012
                                    Publication  Date: 10/2/2012
                                    Citation: Jin, V.L., Baker, J.M., Johnson, J.M., Lehman, R.M., Osborne, S.L., Sauer, T.J., Stott, D.E., Varvel, G.E., Venterea, R.T. 2012. Greenhouse gas fluxes in response to corn stover harvest. Sungrant Initiative 2012 Natinal Conference Program and Agenda. p. 68.Interpretive Summary:
                                Technical Abstract: Agricultural soils play a critical role in mitigating the increasing levels of atmospheric greenhouse gases (GHGs) such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O).  Identifying optimal management strategies (tillage, irrigation, fertilization) for the removal of corn stover as a bioenergy feedstock is key to the long-term sustainability of grain yields and residue biomass while also minimizing erosion, enhancing soil carbon storage, and reducing agricultural GHG emissions.  Further, empirical evaluations of management impacts on agricultural GHG emissions provide fundamental data needed to quantify the net energy efficiency and economic feasibility of bioenergy production systems.  This assessment reviews GHG fluxes in corn stover removal systems under different management regimes for six corn stover team sites of the SunGrant Regional Partnership.  Cumulative growing-season GHG fluxes varied widely among locations, by management treatment, and from year-to-year.  Despite this high variability, maximum corn stover removal across all sites and all management practices tended to result in lower total emissions of CO2 (-10 to -35%) and N2O (-13 to -33%) compared to no-stover- removal treatments.  Decreases in total CO2 and N2O emissions were attributable to the removal of potentially labile, stover-derived C and N inputs into soils due to stover harvest, as well as possible microclimatic differences.  Soils at all sites also tended to be CH4 neutral or slight CH4 sinks, with no differences between residue removal treatments.  Exceptions to these general trends occurred for all three GHGs, demonstrating the importance of site-specific management and environmental conditions on GHG fluxes in agricultural soils.


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