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 | Acesso ao texto completo restrito à biblioteca da Embrapa Agrobiologia. Para informações adicionais entre em contato com cnpab.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
30/08/2007 |
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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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Circulação/Nível: |
Internacional - A |
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Autoria: |
FISHER, M. J.; BRAZ, S. P.; SANTOS, R. S. M. dos; URQUIAGA, S.; ALVES, B. J. R.; BODDEY, R. M. |
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Afiliação: |
M. J. Fisher, CIAT; S. P. Braz S. P. Braz UFRRJ; R. S. M. dos Santos, UFRRJ; Segundo Urquiaga, Embrapa Agrobiologia; Bruno José Rodrigues Alves, Embrapa Agrobiologia; Robert Michael Boddey, Embrapa Agrobiologia. |
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Título: |
Another dimension to grazing systems: soil carbon. |
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Ano de publicação: |
2007 |
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Fonte/Imprenta: |
Tropical Grasslands, Brisbane, v. 41, p. 65-83, 2007. |
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Idioma: |
Inglês |
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Notas: |
Parceria: Centro Internacional de Agricutltura Tropical, Colômbia. |
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Conteúdo: |
In 1998, Fisher et al. attempted to draw together published and anecdotal information to answer some of the questions raised by the findings of Fisher et al. (1994; 1995), that introduced pas-tures of African grasses on the eastern plains of Colombia accumulated large amounts of C in the soil. This review synthesises the work in both Colombia and Brazil over the last 7 years that answers some of the questions raised and spec-ulations made by Fisher et al. (1998). The most imp0l1ant studies have shown that the rate at which litter decays at the soil surface has been grossly underestimated in the past. As a conse-quence, net aerial primary productivity (NAPP) was shown to be 33.3-33.5 t/ha/yr in well man-aged pastures of introduced grasses without either a legume component or N fertiliser. While data for soil C vary according to the past his-tory and states of the pasture, well managed pas-tures do accumulate C in the soil to levels above that under the native grassland vegetation. Net primary productivity below ground was only slightly less than NAPP. Deficiencies of Nand P are primarily responsible for the widespread deg-radation that occurs when introduced pastures are overgrazed and not fertilised. Heavy stocking rates profoundly change the N cycle and lead to N deficiency and hence degradation in the bulk pasture area by concentrating N recycling from faeces and urine in rest areas and watering points. Here the pasture is so damaged by trampling. that it cannot take advantage of the increased fertility. MenosIn 1998, Fisher et al. attempted to draw together published and anecdotal information to answer some of the questions raised by the findings of Fisher et al. (1994; 1995), that introduced pas-tures of African grasses on the eastern plains of Colombia accumulated large amounts of C in the soil. This review synthesises the work in both Colombia and Brazil over the last 7 years that answers some of the questions raised and spec-ulations made by Fisher et al. (1998). The most imp0l1ant studies have shown that the rate at which litter decays at the soil surface has been grossly underestimated in the past. As a conse-quence, net aerial primary productivity (NAPP) was shown to be 33.3-33.5 t/ha/yr in well man-aged pastures of introduced grasses without either a legume component or N fertiliser. While data for soil C vary according to the past his-tory and states of the pasture, well managed pas-tures do accumulate C in the soil to levels above that under the native grassland vegetation. Net primary productivity below ground was only slightly less than NAPP. Deficiencies of Nand P are primarily responsible for the widespread deg-radation that occurs when introduced pastures are overgrazed and not fertilised. Heavy stocking rates profoundly change the N cycle and lead to N deficiency and hence degradation in the bulk pasture area by concentrating N recycling from faeces and urine in rest areas and watering points. Here the pasture is so damaged by trampling. that it cannot take advan... Mostrar Tudo |
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Palavras-Chave: |
Grazing systems; Sistema de pastoreio. |
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Categoria do assunto: |
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Marc: |
LEADER 02167naa a2200217 a 4500
001 1629411
005 2015-03-18
008 2007 bl --- 0-- u #d
100 1 $aFISHER, M. J.
245 $aAnother dimension to grazing systems$bsoil carbon.
260 $c2007
500 $aParceria: Centro Internacional de Agricutltura Tropical, Colômbia.
520 $aIn 1998, Fisher et al. attempted to draw together published and anecdotal information to answer some of the questions raised by the findings of Fisher et al. (1994; 1995), that introduced pas-tures of African grasses on the eastern plains of Colombia accumulated large amounts of C in the soil. This review synthesises the work in both Colombia and Brazil over the last 7 years that answers some of the questions raised and spec-ulations made by Fisher et al. (1998). The most imp0l1ant studies have shown that the rate at which litter decays at the soil surface has been grossly underestimated in the past. As a conse-quence, net aerial primary productivity (NAPP) was shown to be 33.3-33.5 t/ha/yr in well man-aged pastures of introduced grasses without either a legume component or N fertiliser. While data for soil C vary according to the past his-tory and states of the pasture, well managed pas-tures do accumulate C in the soil to levels above that under the native grassland vegetation. Net primary productivity below ground was only slightly less than NAPP. Deficiencies of Nand P are primarily responsible for the widespread deg-radation that occurs when introduced pastures are overgrazed and not fertilised. Heavy stocking rates profoundly change the N cycle and lead to N deficiency and hence degradation in the bulk pasture area by concentrating N recycling from faeces and urine in rest areas and watering points. Here the pasture is so damaged by trampling. that it cannot take advantage of the increased fertility.
653 $aGrazing systems
653 $aSistema de pastoreio
700 1 $aBRAZ, S. P.
700 1 $aSANTOS, R. S. M. dos
700 1 $aURQUIAGA, S.
700 1 $aALVES, B. J. R.
700 1 $aBODDEY, R. M.
773 $tTropical Grasslands, Brisbane$gv. 41, p. 65-83, 2007.
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