Influence of spatially dependent, modeled soil carbon emission factors on life-cycle greenhouse gas emissions of corn and cellulosic ethanol
Converting land to biofuel feedstock production incurs changes in soil organic carbon (SOC) that can influence biofuel life‐cycle greenhouse gas (GHG) emissions. Estimates of these land use change (LUC) and life‐cycle GHG emissions affect biofuels' attractiveness and eligibility under a number of re...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Wiley
2016
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| Online Access: | https://hdl.handle.net/10568/147875 |
| _version_ | 1855519202449817600 |
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| author | Qin, Zhangcai Dunn, Jennifer B. Kwon, Ho Young Mueller, Steffen Wander, Michelle M. |
| author_browse | Dunn, Jennifer B. Kwon, Ho Young Mueller, Steffen Qin, Zhangcai Wander, Michelle M. |
| author_facet | Qin, Zhangcai Dunn, Jennifer B. Kwon, Ho Young Mueller, Steffen Wander, Michelle M. |
| author_sort | Qin, Zhangcai |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Converting land to biofuel feedstock production incurs changes in soil organic carbon (SOC) that can influence biofuel life‐cycle greenhouse gas (GHG) emissions. Estimates of these land use change (LUC) and life‐cycle GHG emissions affect biofuels' attractiveness and eligibility under a number of renewable fuel policies in the USA and abroad. Modeling was used to refine the spatial resolution and depth extent of domestic estimates of SOC change for land (cropland, cropland pasture, grassland, and forest) conversion scenarios to biofuel crops (corn, corn stover, switchgrass, Miscanthus, poplar, and willow) at the county level in the USA. Results show that in most regions, conversions from cropland and cropland pasture to biofuel crops led to neutral or small levels of SOC sequestration, while conversion of grassland and forest generally caused net SOC loss. SOC change results were incorporated into the Greenhouse Gases, Regulated Emissions, and Energy use in Transportation (GREET) model to assess their influence on life‐cycle GHG emissions of corn and cellulosic ethanol. Total LUC GHG emissions (g CO2eq MJ−1) were 2.1–9.3 for corn‐, −0.7 for corn stover‐, −3.4 to 12.9 for switchgrass‐, and −20.1 to −6.2 for Miscanthus ethanol; these varied with SOC modeling assumptions applied. Extending the soil depth from 30 to 100 cm affected spatially explicit SOC change and overall LUC GHG emissions; however, the influence on LUC GHG emission estimates was less significant in corn and corn stover than cellulosic feedstocks. Total life‐cycle GHG emissions (g CO2eq MJ−1, 100 cm) were estimated to be 59–66 for corn ethanol, 14 for stover ethanol, 18–26 for switchgrass ethanol, and −7 to −0.6 for Miscanthus ethanol. The LUC GHG emissions associated with poplar‐ and willow‐derived ethanol may be higher than that for switchgrass ethanol due to lower biomass yield. |
| format | Journal Article |
| id | CGSpace147875 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace1478752025-02-24T06:49:12Z Influence of spatially dependent, modeled soil carbon emission factors on life-cycle greenhouse gas emissions of corn and cellulosic ethanol Qin, Zhangcai Dunn, Jennifer B. Kwon, Ho Young Mueller, Steffen Wander, Michelle M. panicum virgatum greenhouse gases models populus life cycle analysis greenhouse gas emissions biofuels pollution forests ethanol maize capacity development farmland salix land use grasslands switchgrass miscanthus emissions Converting land to biofuel feedstock production incurs changes in soil organic carbon (SOC) that can influence biofuel life‐cycle greenhouse gas (GHG) emissions. Estimates of these land use change (LUC) and life‐cycle GHG emissions affect biofuels' attractiveness and eligibility under a number of renewable fuel policies in the USA and abroad. Modeling was used to refine the spatial resolution and depth extent of domestic estimates of SOC change for land (cropland, cropland pasture, grassland, and forest) conversion scenarios to biofuel crops (corn, corn stover, switchgrass, Miscanthus, poplar, and willow) at the county level in the USA. Results show that in most regions, conversions from cropland and cropland pasture to biofuel crops led to neutral or small levels of SOC sequestration, while conversion of grassland and forest generally caused net SOC loss. SOC change results were incorporated into the Greenhouse Gases, Regulated Emissions, and Energy use in Transportation (GREET) model to assess their influence on life‐cycle GHG emissions of corn and cellulosic ethanol. Total LUC GHG emissions (g CO2eq MJ−1) were 2.1–9.3 for corn‐, −0.7 for corn stover‐, −3.4 to 12.9 for switchgrass‐, and −20.1 to −6.2 for Miscanthus ethanol; these varied with SOC modeling assumptions applied. Extending the soil depth from 30 to 100 cm affected spatially explicit SOC change and overall LUC GHG emissions; however, the influence on LUC GHG emission estimates was less significant in corn and corn stover than cellulosic feedstocks. Total life‐cycle GHG emissions (g CO2eq MJ−1, 100 cm) were estimated to be 59–66 for corn ethanol, 14 for stover ethanol, 18–26 for switchgrass ethanol, and −7 to −0.6 for Miscanthus ethanol. The LUC GHG emissions associated with poplar‐ and willow‐derived ethanol may be higher than that for switchgrass ethanol due to lower biomass yield. 2016-12-23 2024-06-21T09:23:26Z 2024-06-21T09:23:26Z Journal Article https://hdl.handle.net/10568/147875 en https://doi.org/10.1111/gcbb.12237 Open Access Wiley Qin, Zhangcai; Dunn, Jennifer B.; Kwon, Ho Young; Mueller, Steffen; and Wander, Michelle M. 2016. Influence of spatially dependent, modeled soil carbon emission factors on life-cycle greenhouse gas emissions of corn and cellulosic ethanol. GCB Bioenergy 8(6): 1136 – 1149. https://doi.org/10.1111/gcbb.12333 |
| spellingShingle | panicum virgatum greenhouse gases models populus life cycle analysis greenhouse gas emissions biofuels pollution forests ethanol maize capacity development farmland salix land use grasslands switchgrass miscanthus emissions Qin, Zhangcai Dunn, Jennifer B. Kwon, Ho Young Mueller, Steffen Wander, Michelle M. Influence of spatially dependent, modeled soil carbon emission factors on life-cycle greenhouse gas emissions of corn and cellulosic ethanol |
| title | Influence of spatially dependent, modeled soil carbon emission factors on life-cycle greenhouse gas emissions of corn and cellulosic ethanol |
| title_full | Influence of spatially dependent, modeled soil carbon emission factors on life-cycle greenhouse gas emissions of corn and cellulosic ethanol |
| title_fullStr | Influence of spatially dependent, modeled soil carbon emission factors on life-cycle greenhouse gas emissions of corn and cellulosic ethanol |
| title_full_unstemmed | Influence of spatially dependent, modeled soil carbon emission factors on life-cycle greenhouse gas emissions of corn and cellulosic ethanol |
| title_short | Influence of spatially dependent, modeled soil carbon emission factors on life-cycle greenhouse gas emissions of corn and cellulosic ethanol |
| title_sort | influence of spatially dependent modeled soil carbon emission factors on life cycle greenhouse gas emissions of corn and cellulosic ethanol |
| topic | panicum virgatum greenhouse gases models populus life cycle analysis greenhouse gas emissions biofuels pollution forests ethanol maize capacity development farmland salix land use grasslands switchgrass miscanthus emissions |
| url | https://hdl.handle.net/10568/147875 |
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