Straw management effects on global warming potential and yield-scaled greenhouse gas emissions in a subtropical rice ecosystem
ABSTRACT Global warming potential (GWP) of rice paddies depends on straw management. This study evaluated methane (CH4) and nitrous oxide (N2O) emissions and soil C stocks to determine GWP and yield-scaled GWP under different strategies and intensities of rice straw management in a subtropical clima...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Ciência do Solo
2023-05-01
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| Series: | Revista Brasileira de Ciência do Solo |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832023000500503&lng=en&tlng=en |
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| author | Eduardo Lorensi de Souza Douglas Adams Weiler Cimelio Bayer Enio Marchesan Bruno Chaves Getúlio Elias Pilecco Raquel Schmatz Sandro José Giacomini |
| author_facet | Eduardo Lorensi de Souza Douglas Adams Weiler Cimelio Bayer Enio Marchesan Bruno Chaves Getúlio Elias Pilecco Raquel Schmatz Sandro José Giacomini |
| author_sort | Eduardo Lorensi de Souza |
| collection | DOAJ |
| description | ABSTRACT Global warming potential (GWP) of rice paddies depends on straw management. This study evaluated methane (CH4) and nitrous oxide (N2O) emissions and soil C stocks to determine GWP and yield-scaled GWP under different strategies and intensities of rice straw management in a subtropical climate. We hypothesized that decreasing soil management intensity and straw incorporation in the soil would reduce GWP. Methane fluxes were substantially higher during the rice growing season than in the off-season, while the opposite was observed for N2O fluxes. The cumulative emissions of CH4 during the growing season among the straw management strategies evaluated ranged from 165.8 to 586.0 kg ha-1. Annual CH4 emissions were lower when soil and straw received some type of management compared to no-tillage. Daily N2O fluxes ranged from -2.8 to 201.7 g ha-1 day-1; cumulative N2O emissions during the off-season ranged from 455.2 to 2816.5 g ha-1. During the off-season, strategies to reduce N2O emissions include post-harvest straw incorporation using a disc harrow, winter straw removal, and ryegrass cropping. Soil organic C stocks ranged from 35.96 to 38.36 Mg ha-1. Straw management using a disc harrow reduced soil organic C stocks, with more adverse effects than straw removal. Soil and rice straw management did not affect rice grain yield, with an average of 10.4 Mg ha-1. Methane emissions were the main component of GWP in all straw management systems. The contribution of N2O emissions to GWP was small and mostly (>85 %) determined by off-season emissions. Yield-scaled GWP ranged from 0.64 to 1.06 Mg CO2eq Mg-1 yield and was lower when soil and straw management systems occurred shortly after the rice harvest. Our results indicate that soil and straw management immediately after rice harvest reduces CH4 emissions, GWP, and yield-scaled GWP. |
| first_indexed | 2024-03-13T08:44:21Z |
| format | Article |
| id | doaj.art-ad4d5afe0a6a4783bbfcc41ef06ff913 |
| institution | Directory Open Access Journal |
| issn | 1806-9657 |
| language | English |
| last_indexed | 2024-03-13T08:44:21Z |
| publishDate | 2023-05-01 |
| publisher | Sociedade Brasileira de Ciência do Solo |
| record_format | Article |
| series | Revista Brasileira de Ciência do Solo |
| spelling | doaj.art-ad4d5afe0a6a4783bbfcc41ef06ff9132023-05-30T07:36:47ZengSociedade Brasileira de Ciência do SoloRevista Brasileira de Ciência do Solo1806-96572023-05-0147spe10.36783/18069657rbcs20220134Straw management effects on global warming potential and yield-scaled greenhouse gas emissions in a subtropical rice ecosystemEduardo Lorensi de Souzahttps://orcid.org/0000-0003-4834-0066Douglas Adams Weilerhttps://orcid.org/0000-0002-9036-3176Cimelio Bayerhttps://orcid.org/0000-0001-8553-7330Enio Marchesanhttps://orcid.org/0000-0002-6759-1058Bruno Chaveshttps://orcid.org/0000-0002-2679-6479Getúlio Elias Pileccohttps://orcid.org/0000-0002-8784-4577Raquel Schmatzhttps://orcid.org/0000-0001-8239-8195Sandro José Giacominihttps://orcid.org/0000-0001-8916-8958ABSTRACT Global warming potential (GWP) of rice paddies depends on straw management. This study evaluated methane (CH4) and nitrous oxide (N2O) emissions and soil C stocks to determine GWP and yield-scaled GWP under different strategies and intensities of rice straw management in a subtropical climate. We hypothesized that decreasing soil management intensity and straw incorporation in the soil would reduce GWP. Methane fluxes were substantially higher during the rice growing season than in the off-season, while the opposite was observed for N2O fluxes. The cumulative emissions of CH4 during the growing season among the straw management strategies evaluated ranged from 165.8 to 586.0 kg ha-1. Annual CH4 emissions were lower when soil and straw received some type of management compared to no-tillage. Daily N2O fluxes ranged from -2.8 to 201.7 g ha-1 day-1; cumulative N2O emissions during the off-season ranged from 455.2 to 2816.5 g ha-1. During the off-season, strategies to reduce N2O emissions include post-harvest straw incorporation using a disc harrow, winter straw removal, and ryegrass cropping. Soil organic C stocks ranged from 35.96 to 38.36 Mg ha-1. Straw management using a disc harrow reduced soil organic C stocks, with more adverse effects than straw removal. Soil and rice straw management did not affect rice grain yield, with an average of 10.4 Mg ha-1. Methane emissions were the main component of GWP in all straw management systems. The contribution of N2O emissions to GWP was small and mostly (>85 %) determined by off-season emissions. Yield-scaled GWP ranged from 0.64 to 1.06 Mg CO2eq Mg-1 yield and was lower when soil and straw management systems occurred shortly after the rice harvest. Our results indicate that soil and straw management immediately after rice harvest reduces CH4 emissions, GWP, and yield-scaled GWP.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832023000500503&lng=en&tlng=ennitrous oxidemethaneflooded riceglobal warming potentialrice straw |
| spellingShingle | Eduardo Lorensi de Souza Douglas Adams Weiler Cimelio Bayer Enio Marchesan Bruno Chaves Getúlio Elias Pilecco Raquel Schmatz Sandro José Giacomini Straw management effects on global warming potential and yield-scaled greenhouse gas emissions in a subtropical rice ecosystem Revista Brasileira de Ciência do Solo nitrous oxide methane flooded rice global warming potential rice straw |
| title | Straw management effects on global warming potential and yield-scaled greenhouse gas emissions in a subtropical rice ecosystem |
| title_full | Straw management effects on global warming potential and yield-scaled greenhouse gas emissions in a subtropical rice ecosystem |
| title_fullStr | Straw management effects on global warming potential and yield-scaled greenhouse gas emissions in a subtropical rice ecosystem |
| title_full_unstemmed | Straw management effects on global warming potential and yield-scaled greenhouse gas emissions in a subtropical rice ecosystem |
| title_short | Straw management effects on global warming potential and yield-scaled greenhouse gas emissions in a subtropical rice ecosystem |
| title_sort | straw management effects on global warming potential and yield scaled greenhouse gas emissions in a subtropical rice ecosystem |
| topic | nitrous oxide methane flooded rice global warming potential rice straw |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832023000500503&lng=en&tlng=en |
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