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  • Carbon debt of field-scale conservation reserve program grasslands converted to annual and perennial bioenergy crops

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    Hamilton208731.pdf (666.9Kb)
    Author(s)
    Abraha, Michael
    Gelfand, Ilya
    Hamilton, Stephen K
    Chen, Jiquan
    Robertson, G Philip
    Griffith University Author(s)
    Hamilton, Stephen K.
    Year published
    2019
    Metadata
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    Abstract
    Over 5 million ha of US Conservation Reserve Program (CRP) grasslands have been converted to annual crops since 2000, driven mainly by demand for corn grain ethanol. Much of the soil carbon sequestered under CRP is lost upon conversion, creating a 'carbon debt' that is presumed to be repaid by future greenhouse gas (GHG) savings from ethanol's substitution for petroleum. Model simulations, extrapolations, and national statistics rather than direct measurements have been used thus far to estimate the long-term global warming impact (GWI) of such conversions. Here we report measured GWIs for three 22-year-old CRP grassland ...
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    Over 5 million ha of US Conservation Reserve Program (CRP) grasslands have been converted to annual crops since 2000, driven mainly by demand for corn grain ethanol. Much of the soil carbon sequestered under CRP is lost upon conversion, creating a 'carbon debt' that is presumed to be repaid by future greenhouse gas (GHG) savings from ethanol's substitution for petroleum. Model simulations, extrapolations, and national statistics rather than direct measurements have been used thus far to estimate the long-term global warming impact (GWI) of such conversions. Here we report measured GWIs for three 22-year-old CRP grassland fields and three conventionally tilled agricultural (AGR) fields (11–17 ha) converted to either annual no-till corn or perennial cellulosic (switchgrass or restored prairie) bioenergy crops. We assessed GWIs for each field over eight years using whole-system life cycle analysis (LCA) by measuring: (a) GHG fluxes via eddy covariance and static chamber methodologies, (b) farming operations and agronomic inputs, and (c) the fossil fuel offset by ethanol use. Payback times were much longer than those estimated by prior modeling efforts. After 8 years, cumulative GWIs of switchgrass, restored prairie, and corn at the CRP grasslands were, respectively, −2.6 ± 4.0, 6.9 ± 3.6 and 85.2 ± 5.1 Mg CO2-equivalent ha−1. The switchgrass system had repaid its carbon debt by year eight and the restored prairie will have likely repaid by year ten; however, the no-till corn system appears likely to require >300 years. The same bioenergy crops grown on former agricultural lands, with no sequestered carbon lost on conversion, repaid their carbon debts within two years. Results indicate that GWI estimates and carbon debt payback times due to conversion of CRP lands to annual bioenergy crops have been substantially underestimated by current models.
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    Journal Title
    ENVIRONMENTAL RESEARCH LETTERS
    Volume
    14
    Issue
    2
    DOI
    https://doi.org/10.1088/1748-9326/aafc10
    Copyright Statement
    © The Author(s) 2019. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
    Subject
    Environmental management
    Environmentally sustainable engineering
    Agricultural biotechnology
    Publication URI
    http://hdl.handle.net/10072/384447
    Collection
    • Journal articles

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