Campus Units
Agronomy
Document Type
Article
Publication Version
Published Version
Publication Date
2014
Journal or Book Title
Soil Science Society of America Journal
Volume
78
Issue
4
First Page
1338
Last Page
1350
DOI
10.2136/sssaj2014.02.0072
Abstract
The interest in bioenergy crops has raised questions as to the potential of management strategies to preserve soil C pools and soil quality. Since soil-surface CO2 effluxes are a major fate of soil C, knowledge of CO2 efflux’s spatial and temporal trends among bioenergy crops will facilitate advances in research on improving terrestrial C-cycle models as well as decision support tools for policy and land-management. Our objective was to evaluate spatial and temporal dynamics of soil-surface CO2 effluxes in bioenergy-based corn (Zea mays L.) and reconstructed prairie systems. Systems evaluated included continuous corn (harvested for grain and 50% of the corn stover) with and without a cover crop, mixed prairies (harvested for aboveground biomass) with and without N fertilization, and corn–soybean [Glycine max (L.) Merr.] rotations harvested for grain. Soil-surface CO2 effluxes, soil temperature, and soil water contents were monitored weekly from July 2008 to September 2011 and hourly during portions of 2010 and 2011. Annual soil-surface CO2 effluxes were greater in prairies than row crops and are attributed to greater plant root respiration. Soil-surface CO2 effluxes spatially varied among intra-crop management zones only for continuous corn with stover removal. However, the cover crop reduced CO2 efflux spatial variability 70% of the time as compared to stover removal without a cover crop. Spatial variability of effluxes was not explained by soil physical properties or conditions. Temperature-induced diurnal fluctuations of CO2 effluxes were not evident during apparent soil–water redistribution. Further research on the mechanisms behind this process is needed followed by incorporation of mechanisms into CO2efflux models.
Rights
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Language
en
File Format
application/pdf
Recommended Citation
Daigh, Aaron L.; Sauer, Thomas J.; Xiao, Xinhua; and Horton, Robert, "Spatial and Temporal Dynamics of Soil-Surface Carbon Dioxide Emissions in Bioenergy Corn Rotations and Reconstructed Prairies" (2014). Agronomy Publications. 400.
https://lib.dr.iastate.edu/agron_pubs/400
Included in
Agriculture Commons, Agronomy and Crop Sciences Commons, Natural Resources and Conservation Commons, Soil Science Commons
Comments
This article is published as Daigh, Aaron L., Thomas J. Sauer, Xinhua Xiao, and Robert Horton. "Spatial and temporal dynamics of soil-surface carbon dioxide emissions in bioenergy corn rotations and reconstructed prairies." Soil Science Society of America Journal 78, no. 4 (2014): 1338-1350. doi: 10.2136/sssaj2014.02.0072. Posted with permission.