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Title:   Author  item
                                            Schmer, Martyitem
                                            Mitchell, Robert

                                                         - *Rob*item
                                            Vogel, Kennethitem
                                            SCHACHT, WALTER - University Of Nebraskaitem
                                            MARX, DAVID - University Of Nebraska
  Submitted to: BioEnergy Research
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 8/6/2009
                                    Publication  Date: 6/1/2010
                                    Citation: Schmer, M.R., Mitchell, R., Vogel, K.P., Schacht, W.H., Marx, D.A. 2010. Spatial and Temporal Effects on Switchgrass Stands and Yield in the Great Plains. BioEnergy Research. 3:159–171.Interpretive Summary: Switchgrass (Panicum virgatum L.) is being developed into a bioenergy crop for use in temperate regions of the USA. Information on spatial and temporial variation for stands and biomass yield among and within fields in large agroecoregions is not available.  Spatial and temporal variation information is needed to model feedstock availability for future biorefineries.  In this study, the spatial and temporal variation for biomass yield and stands was determined among and within 10 fields located in North Dakota, South Dakota, and Nebraska. Switchgrass fields were managed for bioenergy from 2000 to 2004 for the Nebraska locations and 2001 to 2005 for the South Dakota and North Dakota locations.  A global positioning system (GPS) receiver was used to repeatedly measure within field quadrat sites for switchgrass stands using frequency grid measurements in June for five growing seasons.  Sixteen quadrat yield samples were taken post-killing frost in the establishment year and in August in subsequent years at each location. Topographic within field effects on switchgrass stand frequency and biomass yields were largely insignificant.  Stands tended to increase from establishment year to year 3 and then begin to plateau.  Weather factors, which were the principal source of temporal variation, were more important in switchgrass yield variation than on switchgrass stand frequencies.  Temporal standard deviations for yield were higher on quadrat sites with higher than average field means while temporal standard deviations were smaller in quadrat sites that had lower than average field means at six locations. In the Northern Great Plains agroecoregion, there is greater temporal and spatial variation for switchgrass biomass yields among fields than within fields.  Results indicate that modeling feedstock availability for a biorefinery can be based on field scale yields.
                                Technical Abstract: Switchgrass (Panicum virgatum L.) is being developed into a perennial, herbaceous, cellulosic feedstock crop for use in temperate regions of the USA. Information on spatial and temporial variation for stands and biomass yield among and within fields in large agroecoregions is not available.  Spatial and temporal variation information is needed to model feedstock availability for biorefineries.  In this study, the spatial and temporal variation for biomass yield and stands was determined among and within 10 fields located in North Dakota, South Dakota, and Nebraska. Switchgrass fields were managed for bioenergy from 2000 to 2004 for the Nebraska locations and 2001 to 2005 for the South Dakota and North Dakota locations.  A global positioning system (GPS) receiver was used to repeatedly measure within field quadrat sites for switchgrass stands using frequency grid measurements in June for five growing seasons.  Sixteen quadrat yield samples were taken post-killing frost in the establishment year and in August in subsequent years at each location. Topographic within field effects on switchgrass stand frequency and biomass yields were largely insignificant.  Stands tended to increase from establishment year to year 3 and then begin to plateau.  Weather factors, which were the principal source of temporal variation, were more important in switchgrass yield variation than on switchgrass stand frequencies.  Temporal standard deviations for yield were higher on quadrat sites with higher than average field means while temporal standard deviations were smaller in quadrat sites that had lower than average field means at six locations. In the Northern Great Plains agroecoregion, there is greater temporal and spatial variation for switchgrass biomass yields among fields than within fields.  Results indicate that modeling feedstock availability for a biorefinery can be based on field scale yields.


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