Open AccessEnvironmental performance of gasified willow from different lands including land‐use changes
Author(s) -
Saez de Bikuña Koldo,
Hauschild Michael Zwicky,
Pilegaard Kim,
Ibrom Andreas
Publication year - 2017
Publication title -
gcb bioenergy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.378
H-Index - 63
eISSN - 1757-1707
pISSN - 1757-1693
DOI - 10.1111/gcbb.12378
Subject(s) - arable land , short rotation coppice , willow , environmental science , greenhouse gas , land use, land use change and forestry , agroforestry , land use , agricultural land , bioenergy , short rotation forestry , life cycle assessment , agronomy , forestry , agriculture , geography , biofuel , waste management , ecology , engineering , macroeconomics , archaeology , production (economics) , economics , biology
A life‐cycle assessment ( LCA ) of a low‐input, short rotation coppice ( SRC ) willow grown on different Danish lands was performed. Woodchips are gasified, producer gas is used for cogeneration of heat and power ( CHP ), and the ash–char output is applied as soil amendment in the field. A hybrid model was developed for the estimation of greenhouse gas ( GHG ) emissions from indirect land‐use changes ( iLUC ) induced by willow cropping on arable land (iLUC food ). For this, area expansion results from a general equilibrium economic model were combined with global LUC trends to differentiate between land transformation (as additional agricultural expansion, in areas with historical deforestation) and occupation (as delayed relaxation, DR , in areas with historical land abandonment) impacts. A biophysical approach was followed to determine the iLUC feed emissions factor from marginal grassland. Land transformation impacts were derived from latest world deforestation statistics, while a commercial feed mix of equivalent nutritive value was assumed to substitute the displaced grass as fodder. Intensification effects were included in both iLUC factors as additional N‐fertilizer consumption. Finally, DR impacts were considered for abandoned farmland, as a relative C stock loss compared to natural regeneration. ILUC results show that area related GHG emissions are dominant (93% of iLUC food and 80% of iLUC feed ), transformation being more important (82% of iLUC food ) than occupation (11%) impacts. LCA results show that CHP from willow emits 4047 kg CO 2 ‐eq ha occup − 1(or 0.8 gCO 2 ‐eq MJ −1 ) when grown on arable land, while sequestering 43 745 kg CO 2 ‐eq ha occup − 1(or −10.4 gCO 2 ‐eq MJ −1 ) when planted on marginal pastureland, and 134 296 kg CO 2 ‐eq ha occup − 1(or −31.8 gCO 2 ‐eq MJ −1 ) when marginal abandoned land is cultivated. Increasing the bioenergy potential without undesirable iLUC effects, especially relevant regarding biodiversity impacts, requires that part of the marginally used extensive grasslands are released from their current use or energy cropping on abandoned farmland incentivized.