Soil and Variety Effects on the Energy and Carbon Balances of Switchgrass-Derived Ethanol

DOI: 10.4236/jsbs.2012.24010   PDF   HTML   XML   4,304 Downloads   7,549 Views   Citations

Abstract

This study examined the effects of soil and switchgrass variety on sustainability and eco-friendliness of switchgrass-based ethanol production. Using the Agricultural Land Management Alternatives with Numerical Assessment Criteria (ALMANAC) model, switchgrass biomass yields were simulated for several scenarios of soils and varieties. The yields were fed to the Integrated Biomass Supply Analysis and Logistics (IBSAL) model to compute energy use and carbon emissions in the biomass supply chain, which then were used to compute Net Energy Value (NEV) and Carbon Credit Balance (CCB), the indicators of sustainability and eco-friendliness, respectively. The results showed that the values of these indicators increased in the direction of heavier to lighter soils and on the order of north-upland, south-upland, north-lowland, and south-lowland varieties. The values of NEV and CCB increased in the direction of dry to wet year. Gaps among the varieties were smaller in a dry year than in a wet year. From south to north, NEV and CCB decreased for lowland varieties but increased for upland ones. Thus, the differences among the varieties decreased in the direction of lower to higher latitudes. The study demonstrated that the sustainability and eco-friendliness of switchgrass-based ethanol production could be increased with alternative soil and variety options.

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Woli, P. , Paz, J. , Lang, D. , Baldwin, B. and Kiniry, J. (2012) Soil and Variety Effects on the Energy and Carbon Balances of Switchgrass-Derived Ethanol. Journal of Sustainable Bioenergy Systems, 2, 65-74. doi: 10.4236/jsbs.2012.24010.

Conflicts of Interest

The authors declare no conflicts of interest.

References

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