Land-use change to bioenergy production in Europe: implications for the greenhouse gas balance and soil carbon

Axel Don, Bruce Osborne, Astley Hastings, Ute Skiba, Mette S. Carter, Julia Drewer, Heinz Flessa, Annette Freibauer, Niina Hyvonen, Mike B. Jones, Gary J. Lanigan, Ulo Mander, Andrea Monti, Sylvestre Njakou Djomo, John Valentine, Katja Walter, Walter Zegada-Lizarazu, Terenzio Zenone

Research output: Contribution to journalArticle

231 Citations (Scopus)

Abstract

Bioenergy from crops is expected to make a considerable contribution to climate change mitigation. However, bioenergy is not necessarily carbon neutral because emissions of CO2, N2O and CH4 during crop production may reduce or completely counterbalance CO2 savings of the substituted fossil fuels. These greenhouse gases (GHGs) need to be included into the carbon footprint calculation of different bioenergy crops under a range of soil conditions and management practices. This review compiles existing knowledge on agronomic and environmental constraints and GHG balances of the major European bioenergy crops, although it focuses on dedicated perennial crops such as Miscanthus and short rotation coppice species. Such second-generation crops account for only 3% of the current European bioenergy production, but field data suggest they emit 40% to >99% less N2O than conventional annual crops. This is a result of lower fertilizer requirements as well as a higher N-use efficiency, due to effective N-recycling. Perennial energy crops have the potential to sequester additional carbon in soil biomass if established on former cropland (0.44 Mg soil C ha-1 yr-1 for poplar and willow and 0.66 Mg soil C ha-1 yr-1 for Miscanthus). However, there was no positive or even negative effects on the C balance if energy crops are established on former grassland. Increased bioenergy production may also result in direct and indirect land-use changes with potential high C losses when native vegetation is converted to annual crops. Although dedicated perennial energy crops have a high potential to improve the GHG balance of bioenergy production, several agronomic and economic constraints still have to be overcome.
Original languageEnglish
Pages (from-to)372-391
Number of pages20
JournalGlobal Change Biology. Bioenergy
Volume4
Issue number4
Early online date4 Sep 2011
DOIs
Publication statusPublished - 1 Jul 2012

Keywords

  • soil organic carbon
  • biofuel
  • carbon debt
  • carbon footprint
  • land management
  • methane
  • miscanthus
  • nitrous oxide
  • short rotation coppice

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)

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    Don, A., Osborne, B., Hastings, A., Skiba, U., Carter, M. S., Drewer, J., Flessa, H., Freibauer, A., Hyvonen, N., Jones, M. B., Lanigan, G. J., Mander, U., Monti, A., Njakou Djomo, S., Valentine, J., Walter, K., Zegada-Lizarazu, W., & Zenone, T. (2012). Land-use change to bioenergy production in Europe: implications for the greenhouse gas balance and soil carbon. Global Change Biology. Bioenergy, 4(4), 372-391. https://doi.org/10.1111/j.1757-1707.2011.01116.x