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High‐resolution spatial modelling of greenhouse gas emissions from land‐use change to energy crops in the United Kingdom
Authors:Mark Richards  Mark Pogson  Marta Dondini  Edward O Jones  Astley Hastings  Dagmar N Henner  Matthew J Tallis  Eric Casella  Robert W Matthews  Paul A Henshall  Suzanne Milner  Gail Taylor  Niall P McNamara  Jo U Smith  Pete Smith
Institution:1. Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen, UK;2. Academic Group of Engineering, Sports and Sciences, University of Bolton, Bolton, UK;3. Centre for Biological Sciences, University of Southampton, Southampton, UK;4. School of Biological Sciences, University of Portsmouth, Portsmouth, UK;5. Centre for Sustainable Forestry and Climate Change, Forest Research, Farnham, Surrey, UK;6. Centre for Ecology and Hydrology, Lancaster Environment Centre, Lancaster, UK
Abstract:We implemented a spatial application of a previously evaluated model of soil GHG emissions, ECOSSE, in the United Kingdom to examine the impacts to 2050 of land‐use transitions from existing land use, rotational cropland, permanent grassland or woodland, to six bioenergy crops; three ‘first‐generation’ energy crops: oilseed rape, wheat and sugar beet, and three ‘second‐generation’ energy crops: Miscanthus, short rotation coppice willow (SRC) and short rotation forestry poplar (SRF). Conversion of rotational crops to Miscanthus, SRC and SRF and conversion of permanent grass to SRF show beneficial changes in soil GHG balance over a significant area. Conversion of permanent grass to Miscanthus, permanent grass to SRF and forest to SRF shows detrimental changes in soil GHG balance over a significant area. Conversion of permanent grass to wheat, oilseed rape, sugar beet and SRC and all conversions from forest show large detrimental changes in soil GHG balance over most of the United Kingdom, largely due to moving from uncultivated soil to regular cultivation. Differences in net GHG emissions between climate scenarios to 2050 were not significant. Overall, SRF offers the greatest beneficial impact on soil GHG balance. These results provide one criterion for selection of bioenergy crops and do not consider GHG emission increases/decreases resulting from displaced food production, bio‐physical factors (e.g. the energy density of the crop) and socio‐economic factors (e.g. expenditure on harvesting equipment). Given that the soil GHG balance is dominated by change in soil organic carbon (SOC) with the difference among Miscanthus, SRC and SRF largely determined by yield, a target for management of perennial energy crops is to achieve the best possible yield using the most appropriate energy crop and cultivar for the local situation.
Keywords:bioenergy  carbon  greenhouse gas  land‐use change  Miscanthus  short rotation coppice  short rotation forestry  soil
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