Prosiectau fesul blwyddyn
Crynodeb
Soil organic carbon (SOC) is an important carbon pool susceptible to land-use change (LUC). There are concerns that converting grasslands into the C4 bioenergy crop Miscanthus (to meet demands for renewable energy) could negatively impact SOC, resulting in reductions of greenhouse gas mitigation benefits gained from using Miscanthus as a fuel. This work addresses these concerns by sampling soils (0–30 cm) from a site 12 years (T12) after conversion from marginal agricultural grassland into Miscanthus x giganteus and four other novel Miscanthus hybrids. Soil samples were analysed for changes in below-ground biomass, SOC and Miscanthus contribution to SOC (using a 13C natural abundance approach). Findings are compared to ECOSSE soil carbon model results (run for a LUC from grassland to Miscanthus scenario and continued grassland counterfactual), and wider implications are considered in the context of life cycle assessments based on the heating value of the dry matter (DM) feedstock. The mean T12 SOC stock at the site was 8 (±1 standard error) Mg C/ha lower than baseline time zero stocks (T0), with assessment of the five individual hybrids showing that while all had lower SOC stock than at T0 the difference was only significant for a single hybrid. Over the longer term, new Miscanthus C4 carbon replaces pre-existing C3 carbon, though not at a high enough rate to completely offset losses by the end of year 12. At the end of simulated crop lifetime (15 years), the difference in SOC stocks between the two scenarios was 4 Mg C/ha (5 g CO2-eq/MJ). Including modelled LUC-induced SOC loss, along with carbon costs relating to soil nitrous oxide emissions, doubled the greenhouse gas intensity of Miscanthus to give a total global warming potential of 10 g CO2-eq/MJ (180 kg CO2-eq/Mg DM).
Iaith wreiddiol | Saesneg |
---|---|
Tudalennau (o-i) | 1173-1186 |
Nifer y tudalennau | 14 |
Cyfnodolyn | GCB Bioenergy |
Cyfrol | 11 |
Rhif cyhoeddi | 10 |
Dyddiad ar-lein cynnar | 21 Mai 2019 |
Dynodwyr Gwrthrych Digidol (DOIs) | |
Statws | Cyhoeddwyd - 01 Hyd 2019 |
Ôl bys
Gweld gwybodaeth am bynciau ymchwil 'Measured and modelled effect of land-use change from temperate grassland to Miscanthus on soil carbon stocks after 12 years'. Gyda’i gilydd, maen nhw’n ffurfio ôl bys unigryw.Proffiliau
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Iain Donnison
- Cyfadran Gwyddorau Daear a Bywyd, Athrofa y Gwyddorau Biolegol, Amgylcheddol a Gwledig - Professor
- Cyfadran Gwyddorau Daear a Bywyd, Gwyddorau Bywyd - Head of Department - Biological Environmental and Rural Sciences
Unigolyn: Dysgu ac Ymchwil
Prosiectau
- 4 Wedi Gorffen
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Miscanthus biomass options for contaiminated and marginal land: quality, quantity and soil interactions. (MISCOMAR)
Clifton-Brown, J.
FACCEJPI- Agriculture, Food Security and Climate Change- EU
01 Meh 2016 → 30 Mai 2019
Prosiect: Ymchwil a ariannwyd yn allanol
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Measurement and analysis of bioenergy greenhouse gases: Integrating GHGs into LCAs and the UK Biomass Value Chain Modelling Environment MAGLUE
Engineering & Physical Sciences Research Council
01 Ion 2015 → 31 Awst 2018
Prosiect: Ymchwil a ariannwyd yn allanol
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Optimising and sustaining biomass yield
Donnison, I., Farrar, K. & Slavov, G.
01 Ebr 2012 → 31 Maw 2017
Prosiect: Ymchwil a ariannwyd yn allanol
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The genetic improvement of Miscanthus for biomass
Clifton-Brown, J.
01 Ebr 2004 → 31 Maw 2010
Prosiect: Ymchwil a ariannwyd yn allanol