Cited by 232Bioenergy crop production and managementSoil Carbon and Nitrogen DynamicsAgronomic Practices and Intercropping Systems

Comparative Biogeochemical Cycles of Bioenergy Crops Reveal Nitrogen-Fixation and Low Greenhouse Gas Emissions in a Miscanthus × giganteus Agro-Ecosystem

Davis, Sarah C., Parton, William J., Dohleman, Frank G., Smith, Candice M., Grosso, Stephen Del, Kent, Angela D., DeLucia, Evan H.·2010·Ecosystems

Abstract

We evaluated the biogeochemical cycling and relative greenhouse gas (GHG) mitigation potential of proposed biofuel feedstock crops by modeling growth dynamics of Miscanthus × giganteus Greef et Deuter (miscanthus), Panicum virgatum L. (switchgrass), Zea mays L. (corn), and a mixed prairie community under identical field conditions. DAYCENT model simulations for miscanthus were parameterized with data from trial plots in Europe and Illinois, USA. Switchgrass, corn, and prairie ecosystems were simulated using parameters published in the literature. A previously unknown source of nitrogen (N) was necessary to balance the plant nutrient budget in miscanthus crops, leading us to hypothesize that miscanthus growth depends on N-fixation. We tested for nitrogenase activity by acetylene reduction of whole rhizomes and bacteria isolated from the rhizosphere and miscanthus tissue. Our results supported the hypothesis that biological N-fixation contributed to the N demand of miscanthus, a highly productive perennial grass. Corn agro-ecosystems emit 956 to 1899 g CO₂eq m⁻²y⁻¹ greater GHGs (including CO₂, N₂O, CH₄) to the atmosphere than the other biofuel crop alternatives because of greater N₂O emissions from fertilizer additions. Of the feedstock crops evaluated in this study, miscanthus would result in the greatest GHG reduction.

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Crossref · 10.1007/s10021-009-9306-9

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  • Consistent soil N observations after repeated biomass harvesting indicate efficient nutrient cycling and the potential contribution of biological N fixation that was observed in prior studies.

    “Consistent soil N observations after repeated biomass harvesting indicate efficient nutrient cycling and the potential contribution of biological N fixation that was observed in prior studies (Davis et al., 2010; Eckert et al., 2001).”
  • Davis et al. (2010) provided the first evidence of N-fixation in field-grown rhizomes to support the concept that miscanthus depends on N-fixation to satisfy its yearly N need and also predicted that miscanthus N-fixation rates may vary greatly.

    “Davis et al. (2010) provided the first evidence of N- fixation in field- grown rhizomes to support the concept that miscanthus depends on N- fixation to satisfy its yearly N need and also predicted that miscanthus N- fixation rates may vary greatly.”
  • Conversion from annual cropland to a perennial crop such as miscanthus is expected to increase C sequestration due to greater belowground allocation of C compared to annual crops.

    “Conversion from annual cropland to a perennial crop such as miscanthus is expected to increase C sequestration due to greater belowground allocation of C compared to annual crops (Anderson- Teixeira et al., 2009; Davis etal.,2010).”
  • Both herbaceous crops/grasses and short-rotation woody crops can potentially deliver up to 40-50% of the carbon they capture from the atmosphere to the soil as litter and belowground biomass, with inputs varying from less than 1 to more than 4 Mg C ha−1 year−1.

    “Both HCG and SRWC can potentially deliver up to 40–50 % of the C they capture from the atmosphere to the soil as litter and BGB, which can vary from <1 to >4 Mg C ha−1 year−1 [59–61].”
  • Very little CO2 is emitted from Miscanthus stands of different ages.

    “typically very little CO2 is emitted from Miscanthus stands of different ages [59].”

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Authors
Davis, S. C., Parton, W. J., Dohleman, F. G., Smith, C. M., Grosso, S. D., Kent, A. D., & DeLucia, E. H.
Affiliations
  • University of Illinois Urbana-Champaign (US)
  • Colorado State University (US)
Corresponding author
DeLucia, Evan H.
Venue
Ecosystems
Published
2009-12-22
Volume
13
Issue
1
Pages
144-156
ISSN
  • 1432-9840 (ISSN-L)
  • 1435-0629
OpenAlex
W2164803426
Cited by
232
References
63
Citations by year
2026: 3 · 2025: 6 · 2024: 6 · 2023: 13 · 2022: 8 · 2021: 10 · 2020: 17 · 2019: 10 · 2018: 10 · 2017: 10 · 2016: 20 · 2015: 24 · 2014: 16 · 2013: 29 · 2012: 25
FWCI
34.62
Type
journal article
Language
en
Open access
closed
Locations
Ecosystems (publishedVersion)
Funders
Energy Biosciences Institute
Topics
  • Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Bioenergy crop production and management
  • Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
  • Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Agronomic Practices and Intercropping Systems
Keywords
Miscanthus × giganteus, switchgrass, maize, prairie, energy crops, biogeochemical cycles, nitrogen fixation, greenhouse gas emissions, nitrous oxide emissions, methane emissions, CO2 emissions, nitrogenase activity, rhizosphere bacteria, DayCent model, biofuel feedstock, nitrogen balance

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