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BioEnergy Research

, Volume 10, Issue 2, pp 456–464 | Cite as

Soil Carbon and Nitrogen Responses to Nitrogen Fertilizer and Harvesting Rates in Switchgrass Cropping Systems

  • Zachary P. ValdezEmail author
  • William C. Hockaday
  • Caroline A. Masiello
  • Morgan E. Gallagher
  • G. Philip Robertson
Article

Abstract

The environmental sustainability of bioenergy cropping systems depends upon multiple factors such as crop selection, agricultural practices, and the management of carbon (C), nitrogen (N), and water resources. Perennial grasses, such as switchgrass (Panicum virgatum L.), show potential as a sustainable bioenergy source due to high yields on marginal lands with low fertilizer inputs and an extensive root system that may increase sequestration of C and N in subsurface soil horizons. We quantified the C and N stocks in roots, free particulate, and mineral-associated soil organic matter pools in a 4-year-old switchgrass system following conversion from row crop agriculture at the W.K. Kellogg Biological Station in southwest Michigan. Crops were fertilized with nitrogen at either 0, 84, or 196 kg N ha−1 and harvested either once or twice annually. Twice-annual harvesting caused a reduction of C and N stocks in the relatively labile roots and free-particulate organic matter pools. Nitrogen fertilizer significantly reduced total soil organic C and N stocks, particularly in the stable, mineral-associated C and N pools at depths greater than 15 cm. The largest total belowground C stocks in biomass and soil occurred in unfertilized plots with annual harvesting. These findings suggest that fertilization in switchgrass agriculture moderates the sequestration potential of the soil C pool.

Keywords

Switchgrass Panicum virgatum Carbon cycle Nitrogen Bioenergy Biofuel Soil organic matter Biogeochemistry Greenhouse gases 

Notes

Acknowledgements

Support for WCH and ZPV was provided by USDA (AFRI-2011-67009-20074), the Glasscock Energy Research Scholarship, and NSF (DGE-1356113). The field station and switchgrass trials were supported by Great Lakes Bioenergy Research Center grants (Office of Science DE-FCO2-07ER64494 and Office of Energy Efficiency and Renewable Energy DE-ACO5-76RL01830) and the NSF Long-term Ecological Research Program (DEB 1027253). The authors acknowledge the important contributions of S. Vanderwulp, P. Jasrotia, A. Corbin of the KBS, Baylor Professor J.D.W. White, and Baylor students J. Von Bargen, C. Meyers, N. Cestari, R. Davis, and G. Moreira.

Supplementary material

12155_2016_9810_MOESM1_ESM.docx (77 kb)
ESM 1 (DOCX 76 kb)

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • Zachary P. Valdez
    • 1
    Email author
  • William C. Hockaday
    • 1
    • 2
  • Caroline A. Masiello
    • 3
  • Morgan E. Gallagher
    • 3
  • G. Philip Robertson
    • 4
  1. 1.Institute of Ecological, Earth, and Environmental SciencesBaylor UniversityWacoUSA
  2. 2.Department of GeosciencesBaylor UniversityWacoUSA
  3. 3.Department of Earth ScienceRice UniversityHoustonUSA
  4. 4.W.K. Kellogg Biological Station and Department of Plant, Soil and Microbial SciencesMichigan State UniversityHickory CornersUSA

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