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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
25/10/2007 |
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Data da última atualização: |
18/03/2015 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
JANTALIA, C. P.; RESCK, D. V. S.; ALVES, B. J. R.; ZOTARELLI, L.; URQUIAGA, S.; BODDEY, R. M. |
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Afiliação: |
Claudia Pozzi Jantalia, Embrapa Agrobiologia; Dimas Vital Siqueira Resck, Embrapa Cerrados; Bruno José Rodrigues Alves, Embrapa Agrobiologia; Lincoln Zotarelli, UFRRJ; Segundo Urquiaga, Embrapa Agrobiologia; Robert Michael Boddey, Embrapa Agrobiologia. |
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Título: |
Tillage effect on C stocks of a clayey Oxisol under a soybean-based crop rotation in the Brazilian Cerrado region. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
Soil & Tillage Research, Amsterdam, v. 95, n. 1-2, p. 97-109, sept. 2007. |
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Idioma: |
Inglês |
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Notas: |
Parceria: Embrapa Cerrados, University of Florida |
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Conteúdo: |
A large area (180 Mha) of central Brazil is occupied by a savanna biome known as the Cerrado. Annual rainfall in this region varies from 1200 to 2000 mm, although there is a long (not, vert, similar5 month) dry season with almost no rain. This region is regarded by Brazilians as their agricultural frontier and there is a steady growth in the area dedicated to permanent cropping in the region, which today is estimated to occupy 14 Mha. Owing to the dearth of long-term experiments, the impact of continuous cropping on soil carbon stocks remains unclear. The objective of this study was to evaluate the effects of different tillage systems (zero till (ZT) and conventional tillage (CT)) on the change in soil carbon stocks over a 20-year period of the same crop sequence compared to that under a neighbouring area of native vegetation (NV). Only approximately 10 Mg ha-1 of soil carbon in the 0?100 cm depth interval was lost under continuous ZT. However, under CT systems losses were greater (up to 30 Mg C ha-1) when the mouldboard plough was used and/or tillage was performed twice a year. We did not have access to instrumentation to accurately assess soil charcoal but the C/N data and peroxide and dichromate oxidative techniques suggested that not, vert, similar40% of soil C was in this form. The 13C natural abundance of soil profiles indicated that residues of crops (maize) and the spontaneous annual fallow of Brachiaria spp. resulted in integration of significant C4 residues to a depth of at least 40 cm. It would appear that zero tillage, which is already widely adopted in the Cerrado region of Brazil, will have only a small negative long-term impact on soil C stocks, but ploughing, especially more than once a year, will lead to considerably larger soil C losses. MenosA large area (180 Mha) of central Brazil is occupied by a savanna biome known as the Cerrado. Annual rainfall in this region varies from 1200 to 2000 mm, although there is a long (not, vert, similar5 month) dry season with almost no rain. This region is regarded by Brazilians as their agricultural frontier and there is a steady growth in the area dedicated to permanent cropping in the region, which today is estimated to occupy 14 Mha. Owing to the dearth of long-term experiments, the impact of continuous cropping on soil carbon stocks remains unclear. The objective of this study was to evaluate the effects of different tillage systems (zero till (ZT) and conventional tillage (CT)) on the change in soil carbon stocks over a 20-year period of the same crop sequence compared to that under a neighbouring area of native vegetation (NV). Only approximately 10 Mg ha-1 of soil carbon in the 0?100 cm depth interval was lost under continuous ZT. However, under CT systems losses were greater (up to 30 Mg C ha-1) when the mouldboard plough was used and/or tillage was performed twice a year. We did not have access to instrumentation to accurately assess soil charcoal but the C/N data and peroxide and dichromate oxidative techniques suggested that not, vert, similar40% of soil C was in this form. The 13C natural abundance of soil profiles indicated that residues of crops (maize) and the spontaneous annual fallow of Brachiaria spp. resulted in integration of significant C4 residues to a de... Mostrar Tudo |
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Palavras-Chave: |
Arado de aivecas; Carvão não mineral; Disc ploughs; Matéria orgânica do solo; Mouldboard ploughs. |
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Thesagro: |
Arado de Disco; Soja. |
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Thesaurus Nal: |
charcoal; soil organic matter; soybeans. |
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Categoria do assunto: |
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Marc: |
LEADER 02732naa a2200313 a 4500
001 1629548
005 2015-03-18
008 2007 bl uuuu u00u1 u #d
100 1 $aJANTALIA, C. P.
245 $aTillage effect on C stocks of a clayey Oxisol under a soybean-based crop rotation in the Brazilian Cerrado region.
260 $c2007
500 $aParceria: Embrapa Cerrados, University of Florida
520 $aA large area (180 Mha) of central Brazil is occupied by a savanna biome known as the Cerrado. Annual rainfall in this region varies from 1200 to 2000 mm, although there is a long (not, vert, similar5 month) dry season with almost no rain. This region is regarded by Brazilians as their agricultural frontier and there is a steady growth in the area dedicated to permanent cropping in the region, which today is estimated to occupy 14 Mha. Owing to the dearth of long-term experiments, the impact of continuous cropping on soil carbon stocks remains unclear. The objective of this study was to evaluate the effects of different tillage systems (zero till (ZT) and conventional tillage (CT)) on the change in soil carbon stocks over a 20-year period of the same crop sequence compared to that under a neighbouring area of native vegetation (NV). Only approximately 10 Mg ha-1 of soil carbon in the 0?100 cm depth interval was lost under continuous ZT. However, under CT systems losses were greater (up to 30 Mg C ha-1) when the mouldboard plough was used and/or tillage was performed twice a year. We did not have access to instrumentation to accurately assess soil charcoal but the C/N data and peroxide and dichromate oxidative techniques suggested that not, vert, similar40% of soil C was in this form. The 13C natural abundance of soil profiles indicated that residues of crops (maize) and the spontaneous annual fallow of Brachiaria spp. resulted in integration of significant C4 residues to a depth of at least 40 cm. It would appear that zero tillage, which is already widely adopted in the Cerrado region of Brazil, will have only a small negative long-term impact on soil C stocks, but ploughing, especially more than once a year, will lead to considerably larger soil C losses.
650 $acharcoal
650 $asoil organic matter
650 $asoybeans
650 $aArado de Disco
650 $aSoja
653 $aArado de aivecas
653 $aCarvão não mineral
653 $aDisc ploughs
653 $aMatéria orgânica do solo
653 $aMouldboard ploughs
700 1 $aRESCK, D. V. S.
700 1 $aALVES, B. J. R.
700 1 $aZOTARELLI, L.
700 1 $aURQUIAGA, S.
700 1 $aBODDEY, R. M.
773 $tSoil & Tillage Research, Amsterdam$gv. 95, n. 1-2, p. 97-109, sept. 2007.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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