Abstract
Harvesting of corn stover (plant residues) for cellulosic ethanol production must be balanced with the requirement for returning plant residues to agricultural fields to maintain soil structure, fertility, crop protection, and other ecosystem services. High rates of corn stover removal can be associated with decreased soil organic matter (SOM) quantity and quality and increased highly erodible soil aggregate fractions. Limited data are available on the impact of stover harvesting on soil microbial communities which are critical because of their fundamental relationships with C and N cycles, soil fertility, crop protection, and stresses that might be imposed by climate change. Using fatty acid and DNA analyses, we evaluated relative changes in soil fungal and bacterial densities and fungal-to-bacterial (F:B) ratios in response to corn stover removal under no-till, rain-fed management. These studies were performed at four different US locations with contrasting soil-climatic conditions. At one location, residue removal significantly decreased F:B ratios. At this location, cover cropping significantly increased F:B ratios at the highest level of residue removal and thus may be an important practice to minimize changes in soil microbial communities where corn stover is harvested. We also found that in these no-till systems, the 0- to 5-cm depth interval is most likely to experience changes, and detectable effects of stover removal on soil microbial community structure will depend on the duration of stover removal, sampling time, soil type, and annual weather patterns. No-till practices may have limited the rate of change in soil properties associated with stover removal compared to more extensive changes reported at a limited number of tilled sites. Documenting changes in soil microbial communities with stover removal under differing soil-climatic and management conditions will guide threshold levels of stover removal and identify practices (e.g., no-till, cover cropping) that may mitigate undesirable changes in soil properties.
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Acknowledgments
This research was funded by the USDA-Agricultural Research Service (ARS) as part of the USDA-ARS-REAP (Resilient Economic Agricultural Practices) project, with additional funding provided by the North Central Regional Sun Grant Center at South Dakota State University through a grant provided by the US Department of Energy (DOE)—Office of Biomass Programs [now Bioenergy Technology Office (BETO)] under award number DE-FC36-05GO85041. Technical assistance in the field and/or lab is acknowledged from Kayla Miller, Meggan Kowalski, Kurt Dagel, Amy Christie, Don Watts, Joe Million, Jerry Martin, Ray Winans, Anthony Shriner, Warren Busscher, Chris Bauer, Aaron Bereuter, Dennis Francis, Paul Koerner, Susan Siragusa-Ortman, Jamie Pesek, Steve Swanson, David Walla, Chad Rollofson, Gary Amundson, and Nancy Barbour.
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Lehman, R.M., Ducey, T.F., Jin, V.L. et al. Soil Microbial Community Response to Corn Stover Harvesting Under Rain-Fed, No-Till Conditions at Multiple US Locations. Bioenerg. Res. 7, 540–550 (2014). https://doi.org/10.1007/s12155-014-9417-9
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DOI: https://doi.org/10.1007/s12155-014-9417-9