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 | Acesso ao texto completo restrito à biblioteca da Embrapa Soja. Para informações adicionais entre em contato com valeria.cardoso@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação; Embrapa Soja. |
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Data corrente: |
08/05/2023 |
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Data da última atualização: |
04/07/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 3 |
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Autoria: |
BRIEDIS, C.; SÁ, J. C. M. de; LAL, R.; FERREIRA, A. O.; FRANCHINI, J. C.; MILORI, D. M. B. P. |
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Afiliação: |
DEBORA MARCONDES BASTOS PEREIRA, CNPDIA. |
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Título: |
Preservation of labile organic compounds is the pathway for carbon storage in a 23-year continuous no-till system on a Ferralsol in southern Brazil. |
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Ano de publicação: |
2023 |
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Fonte/Imprenta: |
Geoderma Regional, v.33, e00643, 2023. |
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Páginas: |
1 - 10 |
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ISSN: |
2352-0094 |
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DOI: |
https://doi.org/10.1016/j.geodrs.2023.e00643 |
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Idioma: |
Inglês |
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Conteúdo: |
No-till (NT) system has the potential to sequester soil organic carbon (SOC) in the topsoil and increase soil quality. However, SOC accumulation in the soil profile and the mechanisms for SOC stabilization in NT are still a matter of debate, especially for soils of the tropics. Therefore, this study was conducted to investigate the longterm effects of two tillage systems (conventional tillage ? CT and no-till ? NT) on chemical and physical mechanisms of SOC stabilization and how these are related to the accumulation of SOC in the soil profile. Soils were sampled (0?100 cm depth) from a long-term experiment (23 years) established on a Rhodic Ferralsol in southern Brazil. Soils under native vegetation (NV) were used as a baseline. Results showed that conversion of NV to agriculture decreased on average the SOC stock by 70.8 Mg ha− 1 (− 33%) in the 0?100 cm soil layer. Between tillage systems, higher SOC stock was observed under NT than that under CT in the 0?5 and 5?10 cm soil layers, resulting in higher SOC stock in the entire topsoil (0?20 cm) in the conservation system. In the subsoil (20?100 cm), SOC was similar for both tillage systems. Fourier-transform infrared spectroscopy showed differences in the C composition between the tillage systems; an accumulation of labile compounds in the uppermost layer was observed under NT, which resulted in a lower SOM aromaticity index under this treatment than that in soil under CT management. Adoption of NT increased the proportion of large macroaggregates (> 2.0 mm) in 0?5 cm soil layer, resulting in a greater mean weight diameter (MWD) than under CT. Principal component analysis (PCA) and correlation analysis of data for 0?20 cm soil layer showed that SOC stock is positively associated with labile compounds, the proportion of large macroaggregates, and MWD, and negatively with small macroaggregates, aromatic compounds, and aromaticity index. These results indicated that the pathway for SOC accumulation in the topsoil of NT is influenced less by selective preservation but driven by the maintenance of labile organic compounds, a process achieved by the low turnover of large macroaggregates in the NT system MenosNo-till (NT) system has the potential to sequester soil organic carbon (SOC) in the topsoil and increase soil quality. However, SOC accumulation in the soil profile and the mechanisms for SOC stabilization in NT are still a matter of debate, especially for soils of the tropics. Therefore, this study was conducted to investigate the longterm effects of two tillage systems (conventional tillage ? CT and no-till ? NT) on chemical and physical mechanisms of SOC stabilization and how these are related to the accumulation of SOC in the soil profile. Soils were sampled (0?100 cm depth) from a long-term experiment (23 years) established on a Rhodic Ferralsol in southern Brazil. Soils under native vegetation (NV) were used as a baseline. Results showed that conversion of NV to agriculture decreased on average the SOC stock by 70.8 Mg ha− 1 (− 33%) in the 0?100 cm soil layer. Between tillage systems, higher SOC stock was observed under NT than that under CT in the 0?5 and 5?10 cm soil layers, resulting in higher SOC stock in the entire topsoil (0?20 cm) in the conservation system. In the subsoil (20?100 cm), SOC was similar for both tillage systems. Fourier-transform infrared spectroscopy showed differences in the C composition between the tillage systems; an accumulation of labile compounds in the uppermost layer was observed under NT, which resulted in a lower SOM aromaticity index under this treatment than that in soil under CT management. Adoption of NT increased the p... Mostrar Tudo |
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Palavras-Chave: |
Conservation agriculture; FTIR spectroscopy; Macroaggregates. |
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Thesagro: |
Carbono; Conservação; Espectrômetro; Ferralsolo. |
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Thesaurus NAL: |
Carbon sequestration; Conservation areas; Ferralsols; Spectroscopy. |
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Categoria do assunto: |
--
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 03249naa a2200349 a 4500
001 2154793
005 2023-07-04
008 2023 bl uuuu u00u1 u #d
022 $a2352-0094
024 7 $ahttps://doi.org/10.1016/j.geodrs.2023.e00643$2DOI
100 1 $aBRIEDIS, C.
245 $aPreservation of labile organic compounds is the pathway for carbon storage in a 23-year continuous no-till system on a Ferralsol in southern Brazil.$h[electronic resource]
260 $c2023
300 $a1 - 10
520 $aNo-till (NT) system has the potential to sequester soil organic carbon (SOC) in the topsoil and increase soil quality. However, SOC accumulation in the soil profile and the mechanisms for SOC stabilization in NT are still a matter of debate, especially for soils of the tropics. Therefore, this study was conducted to investigate the longterm effects of two tillage systems (conventional tillage ? CT and no-till ? NT) on chemical and physical mechanisms of SOC stabilization and how these are related to the accumulation of SOC in the soil profile. Soils were sampled (0?100 cm depth) from a long-term experiment (23 years) established on a Rhodic Ferralsol in southern Brazil. Soils under native vegetation (NV) were used as a baseline. Results showed that conversion of NV to agriculture decreased on average the SOC stock by 70.8 Mg ha− 1 (− 33%) in the 0?100 cm soil layer. Between tillage systems, higher SOC stock was observed under NT than that under CT in the 0?5 and 5?10 cm soil layers, resulting in higher SOC stock in the entire topsoil (0?20 cm) in the conservation system. In the subsoil (20?100 cm), SOC was similar for both tillage systems. Fourier-transform infrared spectroscopy showed differences in the C composition between the tillage systems; an accumulation of labile compounds in the uppermost layer was observed under NT, which resulted in a lower SOM aromaticity index under this treatment than that in soil under CT management. Adoption of NT increased the proportion of large macroaggregates (> 2.0 mm) in 0?5 cm soil layer, resulting in a greater mean weight diameter (MWD) than under CT. Principal component analysis (PCA) and correlation analysis of data for 0?20 cm soil layer showed that SOC stock is positively associated with labile compounds, the proportion of large macroaggregates, and MWD, and negatively with small macroaggregates, aromatic compounds, and aromaticity index. These results indicated that the pathway for SOC accumulation in the topsoil of NT is influenced less by selective preservation but driven by the maintenance of labile organic compounds, a process achieved by the low turnover of large macroaggregates in the NT system
650 $aCarbon sequestration
650 $aConservation areas
650 $aFerralsols
650 $aSpectroscopy
650 $aCarbono
650 $aConservação
650 $aEspectrômetro
650 $aFerralsolo
653 $aConservation agriculture
653 $aFTIR spectroscopy
653 $aMacroaggregates
700 1 $aSÁ, J. C. M. de
700 1 $aLAL, R.
700 1 $aFERREIRA, A. O.
700 1 $aFRANCHINI, J. C.
700 1 $aMILORI, D. M. B. P.
773 $tGeoderma Regional$gv.33, e00643, 2023.
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Embrapa Instrumentação (CNPDIA) |
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