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 | Acesso ao texto completo restrito à biblioteca da Embrapa Arroz e Feijão. Para informações adicionais entre em contato com cnpaf.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Arroz e Feijão. |
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Data corrente: |
30/03/1999 |
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Data da última atualização: |
25/10/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
OLIVEIRA, O. C. de; OLIVEIRA, I. P. de; ALVES, B. J. R.; URQUIAGA, S.; BODDEY, R. M. |
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Afiliação: |
OCTAVIO C. DE OLIVEIRA, INSTITUTO BRASILEIRO DE GEOGRAFIA E ESTATISTICA; ITAMAR PEREIRA DE OLIVEIRA, CNPAF; BRUNO JOSE RODRIGUES ALVES, CNPAB; SEGUNDO SACRAMENTO U CABALLERO, CNPAB; ROBERT MICHAEL BODDEY, CNPAB. |
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Título: |
Chemical and biological indicators of decline/degradation of Brachiaria pastures in the Brazilian Cerrado. |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
Agriculture, Ecosystems & Environment, v. 103, n. 2, p. 289-300, July 2004. |
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ISSN: |
0167-8809 |
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DOI: |
https://doi.org/10.1016/j.agee.2003.12.004 |
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Idioma: |
Inglês |
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Conteúdo: |
Some years after their installation, areas of pasture planted to Brachiaria and other African grasses in the Brazilian savanna (“Cerrado”) region show a continuous decline in forage and animal productivity. If no remedial measures are taken, plant cover decreases, the areas become invaded by weeds and the soil becomes compacted. In Brazil these pastures are described as degraded (“degradada”) and this phenomenon has become the major limiting factor to extensive beef production. However, this process is not yet well understood. A series of evaluations were implemented in representative beef production areas in the Cerrado region in order to determine which chemical and biological parameters could best be used as indicators of degradation. Chronosequences of Brachiaria brizantha and Brachiaria decumbens pastures were used in this study. In degraded pastures the lowest quantities of plant litter and organic matter light fraction were observed, which are important pools in nutrient cycling. Soil microbial biomass carbon decreased as pastures age increased. Soil fertility and plant tissue analyses, and potentially mineralisable nitrogen were not suitable indicators of degradation. Physical fractionation by flotation of soil organic matter (SOM) macro-aggregates (>150 μm) differentiated very clearly more recently reformed B. brizantha pastures from a 20-year-old degraded B. decumbens pasture but this technique requires a lot of time and effort and did not show any very significant changes with age of the reformed pastures. The results of this study suggest that the most reliable and simple indicator of pasture decline was found to be the rate of litter deposition, followed by microbial biomass C and pasture regrowth after cutting. MenosSome years after their installation, areas of pasture planted to Brachiaria and other African grasses in the Brazilian savanna (“Cerrado”) region show a continuous decline in forage and animal productivity. If no remedial measures are taken, plant cover decreases, the areas become invaded by weeds and the soil becomes compacted. In Brazil these pastures are described as degraded (“degradada”) and this phenomenon has become the major limiting factor to extensive beef production. However, this process is not yet well understood. A series of evaluations were implemented in representative beef production areas in the Cerrado region in order to determine which chemical and biological parameters could best be used as indicators of degradation. Chronosequences of Brachiaria brizantha and Brachiaria decumbens pastures were used in this study. In degraded pastures the lowest quantities of plant litter and organic matter light fraction were observed, which are important pools in nutrient cycling. Soil microbial biomass carbon decreased as pastures age increased. Soil fertility and plant tissue analyses, and potentially mineralisable nitrogen were not suitable indicators of degradation. Physical fractionation by flotation of soil organic matter (SOM) macro-aggregates (>150 μm) differentiated very clearly more recently reformed B. brizantha pastures from a 20-year-old degraded B. decumbens pasture but this technique requires a lot of time and effort and did not show any very significant... Mostrar Tudo |
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Thesagro: |
Brachiaria Brizantha; Brachiaria Decumbens; Cerrado; Degradação Ambiental. |
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Thesaurus Nal: |
Chemical interactions; Pastures; Savannas; Soil degradation; Tropical pastures. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02706naa a2200301 a 4500
001 1205752
005 2024-10-25
008 2004 bl uuuu u00u1 u #d
022 $a0167-8809
024 7 $ahttps://doi.org/10.1016/j.agee.2003.12.004$2DOI
100 1 $aOLIVEIRA, O. C. de
245 $aChemical and biological indicators of decline/degradation of Brachiaria pastures in the Brazilian Cerrado.$h[electronic resource]
260 $c2004
520 $aSome years after their installation, areas of pasture planted to Brachiaria and other African grasses in the Brazilian savanna (“Cerrado”) region show a continuous decline in forage and animal productivity. If no remedial measures are taken, plant cover decreases, the areas become invaded by weeds and the soil becomes compacted. In Brazil these pastures are described as degraded (“degradada”) and this phenomenon has become the major limiting factor to extensive beef production. However, this process is not yet well understood. A series of evaluations were implemented in representative beef production areas in the Cerrado region in order to determine which chemical and biological parameters could best be used as indicators of degradation. Chronosequences of Brachiaria brizantha and Brachiaria decumbens pastures were used in this study. In degraded pastures the lowest quantities of plant litter and organic matter light fraction were observed, which are important pools in nutrient cycling. Soil microbial biomass carbon decreased as pastures age increased. Soil fertility and plant tissue analyses, and potentially mineralisable nitrogen were not suitable indicators of degradation. Physical fractionation by flotation of soil organic matter (SOM) macro-aggregates (>150 μm) differentiated very clearly more recently reformed B. brizantha pastures from a 20-year-old degraded B. decumbens pasture but this technique requires a lot of time and effort and did not show any very significant changes with age of the reformed pastures. The results of this study suggest that the most reliable and simple indicator of pasture decline was found to be the rate of litter deposition, followed by microbial biomass C and pasture regrowth after cutting.
650 $aChemical interactions
650 $aPastures
650 $aSavannas
650 $aSoil degradation
650 $aTropical pastures
650 $aBrachiaria Brizantha
650 $aBrachiaria Decumbens
650 $aCerrado
650 $aDegradação Ambiental
700 1 $aOLIVEIRA, I. P. de
700 1 $aALVES, B. J. R.
700 1 $aURQUIAGA, S.
700 1 $aBODDEY, R. M.
773 $tAgriculture, Ecosystems & Environment$gv. 103, n. 2, p. 289-300, July 2004.
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Embrapa Arroz e Feijão (CNPAF) |
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| 2. |  | SILVA, A. T. L. da; ARAÚJO, R. C. S.; SILVA, D. F.; COSTA, T. F.; LEMOS, I. J. R.; RIBEIRO, N. F. P. Elaboração de projeto de uma indústria de açaí para consolidar o aprendizado das etapas de processo de produção no ensino de engenharia química. In: CONGRESSO BRASILEIRO DE QUÍMICA, 57., 2017, Gramado, RS. Megatendências: Desafios e oportunidades para o futuro da Química. Rio de Janeiro: ABQ, 2017.| Tipo: Artigo em Anais de Congresso |
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