Conversion of grazed pastures to energy cane as a biofuel feedstock alters the emission of GHGs from soils in Southeastern United States

Nuria Gomez-Casanovas, Nicholas J. DeLucia, Tara W. Hudiburg, Carl Bernacchi, Evan H Delucia

Research output: Contribution to journalArticle

Abstract

The cultivation of energy cane throughout the Southeastern United States may displace grazed pastures on organic soil (Histosols) to meet growing demands for biofuels. We combined results from a field experiment with a biogeochemical model to improve our understanding of how the conversion of pasture to energy cane during early crop establishment affected soil GHG (CO2, CH4, and N2O) exchange with the atmosphere. GHG fluxes were measured under both land uses during wet, hot and cool, dry times of year, and following a fertilization event. We also simulated the impact of changes in precipitation on GHG exchange. Higher fertilization of cane contributed to greater emission of N2O than pasture during warmer and wetter times of the year. The model predicted that energy cane emitted more nitrogen than pasture during simulated wetter than drier years. The modeled emission factor for N2O was 20 to 30-fold higher than the default value from IPCC (1%), suggesting that the default IPCC value could dramatically underestimate the consequences of this land conversion on the climate system. Predicted soil CH4 and CO2 fluxes were higher in pasture than energy cane, and this difference was not affected by increasing precipitation. Model simulations predicted that soils under first year cane emit more GHGs than pasture, particularly during wet years, but this difference disappeared two years after energy cane establishment. Our results suggest that management practices may be important in determining soil GHG emissions from energy cane on organic soils particularly during the first year of cane establishment.

Original languageEnglish (US)
Pages (from-to)312-322
Number of pages11
JournalBiomass and Bioenergy
Volume108
DOIs
StatePublished - Jan 2018

Fingerprint

Biofuels
canes
Southeastern United States
feedstocks
biofuels
biofuel
Feedstocks
pasture
pastures
Soils
energy
soil
organic soil
Fluxes
Histosol
organic soils
soil emission
Land use
Crops
Histosols

Keywords

  • Bioenergy
  • CH
  • NO
  • Perennial crops
  • Soil CO efflux
  • Soil respiration

ASJC Scopus subject areas

  • Forestry
  • Renewable Energy, Sustainability and the Environment
  • Agronomy and Crop Science
  • Waste Management and Disposal

Cite this

Conversion of grazed pastures to energy cane as a biofuel feedstock alters the emission of GHGs from soils in Southeastern United States. / Gomez-Casanovas, Nuria; DeLucia, Nicholas J.; Hudiburg, Tara W.; Bernacchi, Carl; Delucia, Evan H.

In: Biomass and Bioenergy, Vol. 108, 01.2018, p. 312-322.

Research output: Contribution to journalArticle

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