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

Abraha, Michael; Gelfand, Ilya; Hamilton, Stephen K.; Chen, Jiquan; Robertson, G. Philip

doi:10.1088/1748-9326/aafc10

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

Journal Article · Fri Feb 01 00:00:00 EST 2019 · Environmental Research Letters

DOI:https://doi.org/10.1088/1748-9326/aafc10· OSTI ID:1494847

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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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Research Organization:: Great Lakes Bioenergy Research Center, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: SC0018409; FC02-07ER64494

OSTI ID:: 1494847

Alternate ID(s):: OSTI ID: 1505776

Journal Information:: Environmental Research Letters, Journal Name: Environmental Research Letters Vol. 14 Journal Issue: 2; ISSN 1748-9326

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 28 works

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