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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
09/08/2004 |
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Data da última atualização: |
09/08/2004 |
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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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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, Amsterdam, v. 103, p. 289-300, 2004. |
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Idioma: |
Inglês |
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Conteúdo: |
Some years after their installation, areas of planted to Brachiaria and other African grasses in the Brazilian savanna ("Cerrado") region show a continuous decline in forage and 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. Choronosequences 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 mm) differentiated very clearly more recently reformed B. brizantha pastures from a 20-year-old degraded B. decumbens pastures but this technique a lot of time and effort and did not show any very significant changes with age of the reformed pastures. The results of this 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 planted to Brachiaria and other African grasses in the Brazilian savanna ("Cerrado") region show a continuous decline in forage and 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. Choronosequences 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 mm) differentiated very clearly more recently reformed B. brizantha pastures from a 20-year-old degraded B. decumbens pastures but this technique a lot of time and effort and did not show any very significant changes with age of t... Mostrar Tudo |
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Palavras-Chave: |
Brachiaria grass. |
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Thesagro: |
Brachiaria; Capim Brachiaria; Cerrado; Pastagem; Vegetação. |
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Thesaurus Nal: |
pastures; savannas; vegetation. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02510naa a2200277 a 4500
001 1626284
005 2004-08-09
008 2004 bl --- 0-- u #d
100 1 $aOLIVEIRA, O. C. de
245 $aChemical and biological indicators of decline/degradation of Brachiaria pastures in the Brazilian cerrado.
260 $c2004
520 $aSome years after their installation, areas of planted to Brachiaria and other African grasses in the Brazilian savanna ("Cerrado") region show a continuous decline in forage and 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. Choronosequences 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 mm) differentiated very clearly more recently reformed B. brizantha pastures from a 20-year-old degraded B. decumbens pastures but this technique a lot of time and effort and did not show any very significant changes with age of the reformed pastures. The results of this 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 $apastures
650 $asavannas
650 $avegetation
650 $aBrachiaria
650 $aCapim Brachiaria
650 $aCerrado
650 $aPastagem
650 $aVegetação
653 $aBrachiaria grass
700 1 $aOLIVEIRA, I. P. de
700 1 $aALVES, B. J. R.
700 1 $aURQUIAGA, S.
700 1 $aBODDEY, R. M.
773 $tAgriculture Ecosystems & Environment, Amsterdam$gv. 103, p. 289-300, 2004.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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Biblioteca |
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Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Meio-Norte; Embrapa Semiárido. |
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Data corrente: |
19/08/1996 |
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Data da última atualização: |
16/01/2024 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
LIMA, J. L. S. de; MEDEIROS-COSTA, J. T. de. |
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Afiliação: |
JOSE LUCIANO SANTOS DE LIMA, CPATSA; JUDAS TADEU DE MEDEIROS-COSTA, IICA. |
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Título: |
Elaboração da flora palmácea (Palmae) do NE do Brasil (nota previa). |
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Ano de publicação: |
1985 |
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Fonte/Imprenta: |
In: CONGRESSO NACIONAL DE BOTÂNICA, 36.; CONFERÊNCIA REGIONAL PAN-AMERICANA DE ANATOMIA DA MADEIRA; ENCONTRO NACIONAL DE CURADORES DE HERBÁRIO, 1., 1985, Curitiba. Programa e resumos... Curitiba: SBB: AIAM, 1985. |
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Páginas: |
p. 393. |
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Idioma: |
Português |
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Conteúdo: |
O Nordeste do Brasil é uma área crítica por abrigar um efetivo populacional humano periodicamente castigado pelas estiagens, e, por esta razão necessitando cada vez mais aproveitar os recursos naturais vegetais nativos e consequentemente ajustados às condições edafo-climáticas locais, a EMBRAPA/CPATSA vem desenvolvendo um Projeto de pesquisas sobre as palmeiras nativas da região em epigrafe, com a finalidade de identificar suas espécies, determinar sua distribuição e efetivos populacionais, sua fenologia, aproveitamento pelas populações locais, potencial econômico das mesmas e organização de uma coleção de referencia. |
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Palavras-Chave: |
Brasil; Nordeste; Palmacea; Palmeira; Planta da Caatinga. |
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Thesagro: |
Botânica; Caatinga; Espécie; Fenologia; Flora; Recurso Natural; Taxonomia; Vegetação Nativa. |
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Thesaurus NAL: |
botany. |
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Categoria do assunto: |
--
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/175951/1/Separata9312.pdf
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Marc: |
LEADER 01575nam a2200301 a 4500
001 1132361
005 2024-01-16
008 1985 bl uuuu u00u1 u #d
100 1 $aLIMA, J. L. S. de
245 $aElaboração da flora palmácea (Palmae) do NE do Brasil (nota previa).
260 $aIn: CONGRESSO NACIONAL DE BOTÂNICA, 36.; CONFERÊNCIA REGIONAL PAN-AMERICANA DE ANATOMIA DA MADEIRA; ENCONTRO NACIONAL DE CURADORES DE HERBÁRIO, 1., 1985, Curitiba. Programa e resumos... Curitiba: SBB: AIAM$c1985
300 $ap. 393.
520 $aO Nordeste do Brasil é uma área crítica por abrigar um efetivo populacional humano periodicamente castigado pelas estiagens, e, por esta razão necessitando cada vez mais aproveitar os recursos naturais vegetais nativos e consequentemente ajustados às condições edafo-climáticas locais, a EMBRAPA/CPATSA vem desenvolvendo um Projeto de pesquisas sobre as palmeiras nativas da região em epigrafe, com a finalidade de identificar suas espécies, determinar sua distribuição e efetivos populacionais, sua fenologia, aproveitamento pelas populações locais, potencial econômico das mesmas e organização de uma coleção de referencia.
650 $abotany
650 $aBotânica
650 $aCaatinga
650 $aEspécie
650 $aFenologia
650 $aFlora
650 $aRecurso Natural
650 $aTaxonomia
650 $aVegetação Nativa
653 $aBrasil
653 $aNordeste
653 $aPalmacea
653 $aPalmeira
653 $aPlanta da Caatinga
700 1 $aMEDEIROS-COSTA, J. T. de.
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Registro original: |
Embrapa Semiárido (CPATSA) |
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