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journal article Aug 29, 2011

Implications for the hydrologic cycle under climate change due to the expansion of bioenergy crops in the Midwestern United States

Phong V. V. Le ORCID Praveen Kumar ORCID Darren T. Drewry
Proceedings of the National Academy of Sciences Vol. 108 No. 37 pp. 15085-15090 · Proceedings of the National Academy of Sciences
View at Publisher Save 10.1073/pnas.1107177108
Abstract
To meet emerging bioenergy demands, significant areas of the large-scale agricultural landscape of the Midwestern United States could be converted to second generation bioenergy crops such as miscanthus and switchgrass. The high biomass productivity of bioenergy crops in a longer growing season linked tightly to water use highlight the potential for significant impact on the hydrologic cycle in the region. This issue is further exacerbated by the uncertainty in the response of the vegetation under elevated CO2and temperature. We use a mechanistic multilayer canopy-root-soil model to (i) capture the eco-physiological acclimations of bioenergy crops under climate change, and (ii) predict how hydrologic fluxes are likely to be altered from their current magnitudes. Observed data and Monte Carlo simulations of weather for recent past and future scenarios are used to characterize the variability range of the predictions. Under present weather conditions, miscanthus and switchgrass utilized more water than maize for total seasonal evapotranspiration by approximately 58% and 36%, respectively. Projected higher concentrations of atmospheric CO2(550 ppm) is likely to decrease water used for evapotranspiration of miscanthus, switchgrass, and maize by 12%, 10%, and 11%, respectively. However, when climate change with projected increases in air temperature and reduced summer rainfall are also considered, there is a net increase in evapotranspiration for all crops, leading to significant reduction in soil-moisture storage and specific surface runoff. These results highlight the critical role of the warming climate in potentially altering the water cycle in the region under extensive conversion of existing maize cropping to support bioenergy demand.
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Metrics
130
Citations
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References
Details
Published
Aug 29, 2011
Vol/Issue
108(37)
Pages
15085-15090
Authors
P
Phong V. V. Le

Department of Civil and Environmental Engineering, University of Illinois, Urbana, IL 61801; and

P
Praveen Kumar

Department of Civil and Environmental Engineering, University of Illinois, Urbana, IL 61801; and

D
Darren T. Drewry

Max-Planck-Institut für Biogeochemie, Postfach 100164, D-07701 Jena, Germany

Cite This Article
Phong V. V. Le, Praveen Kumar, Darren T. Drewry (2011). Implications for the hydrologic cycle under climate change due to the expansion of bioenergy crops in the Midwestern United States. Proceedings of the National Academy of Sciences, 108(37), 15085-15090. https://doi.org/10.1073/pnas.1107177108
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