Soil and root carbon storage is key to climate benefits of bioenergy crops

Yi Yang, David Tilman

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Most bioenergy feedstock studies focus on maximizing aboveground biomass production. Cropland with fertile soils can produce high aboveground biomass yields but its diversion to bioenergy causes greenhouse gas emissions from direct and indirect land use changes. Here, we analyze three grassland experiments that minimize land use changes by using abandoned and degraded agricultural land. We find that soil and root carbon storage is a greater determinant of the climate change mitigation potential of biofuels than aboveground biomass, and tends to be higher for treatments with high plant diversity. Aboveground biomass yield ranged from 450-650 g ha-2 yr-1 for the productive treatments with moderate intensification, but its climate benefit via converting into biofuels and displacing fossil fuels can be substantially reduced by the rebound effect of fuel market. Because of high soil and root C storage rates (152-483 g CO2 ha-2 yr-1), many treatments are carbon negative even without the fossil fuel displacement benefit. To effectively mitigate greenhouse gas emissions, we should focus on increasing belowground carbon storage and explore the potential benefits of high-diversity plant species mixtures.

Original languageEnglish (US)
Pages (from-to)1143-1148
Number of pages6
JournalBiofuel Research Journal
Volume7
Issue number2
DOIs
StatePublished - Mar 1 2020

Bibliographical note

Publisher Copyright:
© 2020 BRTeam.

Keywords

  • Climate change mitigation
  • Consequential-LCA
  • Life-cycle GHG
  • Perennial crops
  • Plant diversity

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