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Initial nitrous oxide, carbon dioxide, and methane costs of converting conservation reserve program grassland to row crops under no-till vs. conventional tillage

Around 4.4 million ha of land in USDA Conservation Reserve Program (CRP) contracts will expire between 2013 and 2018 and some will likely return to crop production. No-till (NT) management offers the potential to reduce the global warming costs of CO(2), CH(4), and N(2)O emissions during CRP convers...

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Autores principales: Ruan, Leilei, Philip Robertson, G
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley & Sons Ltd 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3908366/
https://www.ncbi.nlm.nih.gov/pubmed/23553929
http://dx.doi.org/10.1111/gcb.12216
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author Ruan, Leilei
Philip Robertson, G
author_facet Ruan, Leilei
Philip Robertson, G
author_sort Ruan, Leilei
collection PubMed
description Around 4.4 million ha of land in USDA Conservation Reserve Program (CRP) contracts will expire between 2013 and 2018 and some will likely return to crop production. No-till (NT) management offers the potential to reduce the global warming costs of CO(2), CH(4), and N(2)O emissions during CRP conversion, but to date there have been no CRP conversion tillage comparisons. In 2009, we converted portions of three 9–21 ha CRP fields in Michigan to conventional tillage (CT) or NT soybean production and reserved a fourth field for reference. Both CO(2) and N(2)O fluxes increased following herbicide application in all converted fields, but in the CT treatment substantial and immediate N(2)O and CO(2) fluxes occurred after tillage. For the initial 201-day conversion period, average daily N(2)O fluxes (g N(2)O-N ha(−1) d(−1)) were significantly different in the order: CT (47.5 ± 6.31, n = 6) ≫ NT (16.7 ± 2.45, n = 6) ≫ reference (2.51 ± 0.73, n = 4). Similarly, soil CO(2) fluxes in CT were 1.2 times those in NT and 3.1 times those in the unconverted CRP reference field. All treatments were minor sinks for CH(4) (−0.69 ± 0.42 to −1.86 ± 0.37 g CH(4)–C ha(−1) d(−1)) with no significant differences among treatments. The positive global warming impact (GWI) of converted soybean fields under both CT (11.5 Mg CO(2)e ha(−1)) and NT (2.87 Mg CO(2)e ha(−1)) was in contrast to the negative GWI of the unconverted reference field (−3.5 Mg CO(2)e ha(−1)) with on-going greenhouse gas (GHG) mitigation. N(2)O contributed 39.3% and 55.0% of the GWI under CT and NT systems with the remainder contributed by CO(2) (60.7% and 45.0%, respectively). Including foregone mitigation, we conclude that NT management can reduce GHG costs by ∼60% compared to CT during initial CRP conversion.
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spelling pubmed-39083662014-02-04 Initial nitrous oxide, carbon dioxide, and methane costs of converting conservation reserve program grassland to row crops under no-till vs. conventional tillage Ruan, Leilei Philip Robertson, G Glob Chang Biol Primary Research Articles Around 4.4 million ha of land in USDA Conservation Reserve Program (CRP) contracts will expire between 2013 and 2018 and some will likely return to crop production. No-till (NT) management offers the potential to reduce the global warming costs of CO(2), CH(4), and N(2)O emissions during CRP conversion, but to date there have been no CRP conversion tillage comparisons. In 2009, we converted portions of three 9–21 ha CRP fields in Michigan to conventional tillage (CT) or NT soybean production and reserved a fourth field for reference. Both CO(2) and N(2)O fluxes increased following herbicide application in all converted fields, but in the CT treatment substantial and immediate N(2)O and CO(2) fluxes occurred after tillage. For the initial 201-day conversion period, average daily N(2)O fluxes (g N(2)O-N ha(−1) d(−1)) were significantly different in the order: CT (47.5 ± 6.31, n = 6) ≫ NT (16.7 ± 2.45, n = 6) ≫ reference (2.51 ± 0.73, n = 4). Similarly, soil CO(2) fluxes in CT were 1.2 times those in NT and 3.1 times those in the unconverted CRP reference field. All treatments were minor sinks for CH(4) (−0.69 ± 0.42 to −1.86 ± 0.37 g CH(4)–C ha(−1) d(−1)) with no significant differences among treatments. The positive global warming impact (GWI) of converted soybean fields under both CT (11.5 Mg CO(2)e ha(−1)) and NT (2.87 Mg CO(2)e ha(−1)) was in contrast to the negative GWI of the unconverted reference field (−3.5 Mg CO(2)e ha(−1)) with on-going greenhouse gas (GHG) mitigation. N(2)O contributed 39.3% and 55.0% of the GWI under CT and NT systems with the remainder contributed by CO(2) (60.7% and 45.0%, respectively). Including foregone mitigation, we conclude that NT management can reduce GHG costs by ∼60% compared to CT during initial CRP conversion. John Wiley & Sons Ltd 2013-08 2013-05-02 /pmc/articles/PMC3908366/ /pubmed/23553929 http://dx.doi.org/10.1111/gcb.12216 Text en Copyright © John Wiley & Sons Ltd http://creativecommons.org/licenses/by/3.0/ This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
spellingShingle Primary Research Articles
Ruan, Leilei
Philip Robertson, G
Initial nitrous oxide, carbon dioxide, and methane costs of converting conservation reserve program grassland to row crops under no-till vs. conventional tillage
title Initial nitrous oxide, carbon dioxide, and methane costs of converting conservation reserve program grassland to row crops under no-till vs. conventional tillage
title_full Initial nitrous oxide, carbon dioxide, and methane costs of converting conservation reserve program grassland to row crops under no-till vs. conventional tillage
title_fullStr Initial nitrous oxide, carbon dioxide, and methane costs of converting conservation reserve program grassland to row crops under no-till vs. conventional tillage
title_full_unstemmed Initial nitrous oxide, carbon dioxide, and methane costs of converting conservation reserve program grassland to row crops under no-till vs. conventional tillage
title_short Initial nitrous oxide, carbon dioxide, and methane costs of converting conservation reserve program grassland to row crops under no-till vs. conventional tillage
title_sort initial nitrous oxide, carbon dioxide, and methane costs of converting conservation reserve program grassland to row crops under no-till vs. conventional tillage
topic Primary Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3908366/
https://www.ncbi.nlm.nih.gov/pubmed/23553929
http://dx.doi.org/10.1111/gcb.12216
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