Abstract

Locally produced bioenergy can decrease the dependency on imported fossil fuels in a region, while also being valuable for climate change mitigation. Short-rotation coppice willow is a potentially high-yielding energy crop that can be grown to supply a local energy facility. This study assessed the energy performance and climate impacts when establishing willow on current fallow land in a Swedish region with the purpose of supplying a bio-based combined heat and power plant. Time-dependent life cycle assessment (LCA) was combined with geographic information system (GIS) mapping to include spatial variation in terms of transport distance, initial soil organic carbon content, soil texture and yield. Two climate metrics were used [global warming potential (GWP) and absolute global temperature change potential (AGTP)], and the energy performance was determined by calculating the energy ratio (energy produced per unit of energy used). The results showed that when current fallow land in a Swedish region was used for willow energy, an average energy ratio of 30 MJ MJ(-1) (including heat, power and flue gas condensation) was obtained and on average 84.3 Mg carbon per ha was sequestered in the soil during a 100-year time frame (compared with the reference land use). The processes contributing most to the energy use during one willow rotation were the production and application of fertilizers (similar to 40%), followed by harvest (similar to 35%) and transport (similar to 20%). The temperature response after 100 years of willow cultivation was -6.10(-1)6 K MJ(-1) heat, which is much lower compared with fossil coal and natural gas (70.10(-16) K MJ(-1) heat and 35.10(-16) K MJ heat, respectively). The combined GIS and time-dependent LCA approach developed here can be a useful tool in systematic analysis of bioenergy production systems and related land use effects.

Keywords

bioenergy; geographic information system; global warming; land use; life cycle assessment; Salix; soil organic carbon; spatial variation

Published in

GCB Bioenergy
2017, Volume: 9, number: 5, pages: 973-985

SLU Authors

• Hammar, Torun

  • Department of Energy and Technology, Swedish University of Agricultural Sciences
    

• Hansson, Per-Anders

  • Department of Energy and Technology, Swedish University of Agricultural Sciences
    

• Sundberg, Cecilia

  • Department of Energy and Technology, Swedish University of Agricultural Sciences
    
  • Royal Institute of Technology (KTH)

Sustainable Development Goals

SDG7 Ensure access to affordable, reliable, sustainable and modern energy for all
SDG13 Take urgent action to combat climate change and its impacts


UKÄ Subject classification

Energy Systems
Climate Research


Publication identifier

DOI: https://doi.org/10.1111/gcbb.12399

Permanent link to this page (URI)

https://res.slu.se/id/publ/81025