Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1088/1748-9326/aafc10 |
Carbon debt of field-scale conservation reserve program grasslands converted to annual and perennial bioenergy crops | |
Abraha, Michael1,2,3; Gelfand, Ilya2,3,7; Hamilton, Stephen K.2,3,4; Chen, Jiquan1,2,5; Robertson, G. Philip2,3,6 | |
2019-02-01 | |
发表期刊 | ENVIRONMENTAL RESEARCH LETTERS
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ISSN | 1748-9326 |
出版年 | 2019 |
卷号 | 14期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Israel |
英文摘要 | 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. Weassessed GWIs for each field over eight years using whole-system life cycle analysis (LCA) by measuring: (a) GHGfluxes 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 MgCO2-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. |
英文关键词 | lifecycle analysis (LCA) global warming impact (GWI) greenhouse gas (GHG) fossil fuel corn switchgrass restored prairie |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000459009400001 |
WOS关键词 | ENERGY ; CONTRIBUTE ; CONVERSION ; EMISSIONS ; EXCHANGE ; DIOXIDE ; SOILS ; CORN |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/32101 |
专题 | 气候变化 |
作者单位 | 1.Michigan State Univ, Ctr Global Change & Earth Observat, E Lansing, MI 48823 USA; 2.Michigan State Univ, Great Lakes Bioenergy Res Ctr, E Lansing, MI 48824 USA; 3.Michigan State Univ, WK Kellogg Biol Stn, Hickory Corners, MI 49060 USA; 4.Michigan State Univ, Dept Integrat Biol, E Lansing, MI 48824 USA; 5.Michigan State Univ, Dept Geog Environm & Spatial Sci, E Lansing, MI 48824 USA; 6.Michigan State Univ, Dept Plant Soil & Microbial Sci, E Lansing, MI 48824 USA; 7.Ben Gurion Univ Negev, French Associates Inst Agr & Biotechnol Drylands, Jacob Blaustein Inst Desert Res, IL-84990 Beer Sheva, Israel |
推荐引用方式 GB/T 7714 | Abraha, Michael,Gelfand, Ilya,Hamilton, Stephen K.,et al. Carbon debt of field-scale conservation reserve program grasslands converted to annual and perennial bioenergy crops[J]. ENVIRONMENTAL RESEARCH LETTERS,2019,14(2). |
APA | Abraha, Michael,Gelfand, Ilya,Hamilton, Stephen K.,Chen, Jiquan,&Robertson, G. Philip.(2019).Carbon debt of field-scale conservation reserve program grasslands converted to annual and perennial bioenergy crops.ENVIRONMENTAL RESEARCH LETTERS,14(2). |
MLA | Abraha, Michael,et al."Carbon debt of field-scale conservation reserve program grasslands converted to annual and perennial bioenergy crops".ENVIRONMENTAL RESEARCH LETTERS 14.2(2019). |
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