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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
30/11/2001 |
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Data da última atualização: |
31/05/2007 |
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Autoria: |
TARRE, R.; MACEDO, R.; CANTARUTTI, R. B.; REZENDE, C. D.; PEREIRA, J. M.; FERREIRA, E.; ALVES, B. J. R.; URQUIAGA, S.; BODDEY, R. M. |
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Título: |
The effect of the presence of a forage legume on nitrogen and carbon levels in soils under Brachiaria pastures in the Atlantic forest region of the South of Bahia, Brazil. |
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Ano de publicação: |
2001 |
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Fonte/Imprenta: |
Plant and Soil, Dordrecht, v. 234, n .1, p. 15-26, 2001. |
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Idioma: |
Inglês |
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Conteúdo: |
The impact of forest clearance, and its replacement by Brachiaria pasture, on soil carbon reserves has been studied at amny sites in the Brazilian Amazonian, but to date there appear to be no reports of similar studies undertaker in the Atlantic forest region of Brazil. In this study performed in the extreme south of Bahia, the chance in C and N content of the soil were evaluted from the time of establishment of grass-only B. humidicola and mixed B. humidicola/Desmodium ovolifolium pastures through 9 years of grazing in comparision with the C and N contents of the adjacent secondary forest. The decline in the content of soil C derived from the forest(C3) vegetation and the accumulation of that derived from the Brachiaria (C4) were followed by determining the 13C natural abundance of the soil organic matter (SOM). The pastures were established in 1987, 10 years deforestation, and it was estimated that until 1994 there was a loss in forest-derived C in the top 30 cm of soil of aproximately 20% (9.1mg C há-1). After the establishment of the pastures, C derived from Brachiaria accumulated steadily such that at the sampling (1997) it was estimated 13.9 Mg há -1 was derived from this source under the grass-only pasture(0-30 cm). Samples taken from all pastures and forest in 1997 to a depth of 100 cm showed that below 40 cm depth there was no significant contribution of the Brachiaria-derived C and that total C reserves under the gass/legume and the grass/only pastures were slightly higher than under the forest(not significant at p=0.05). The more metailed sampling under the pasture showed that to a depth of 30 cm there was significanly (P-0.050 more C under the mixed pasture than the grass-only pasture. It was estimated that from the time of establishment the apparent rate of C accumulation (0-100 cm depth) under the grass/legume pastures (1.17 Mg há -1 yr -1) was almost double that under the grass-only pastuires(0.66 Mg há-1 yr-1). The data indicated that newly incorporated SOM derived from the Brachiaria had a considerably higher C:N retio than that present under the forest.
Nitrogênio N; Carbono C MenosThe impact of forest clearance, and its replacement by Brachiaria pasture, on soil carbon reserves has been studied at amny sites in the Brazilian Amazonian, but to date there appear to be no reports of similar studies undertaker in the Atlantic forest region of Brazil. In this study performed in the extreme south of Bahia, the chance in C and N content of the soil were evaluted from the time of establishment of grass-only B. humidicola and mixed B. humidicola/Desmodium ovolifolium pastures through 9 years of grazing in comparision with the C and N contents of the adjacent secondary forest. The decline in the content of soil C derived from the forest(C3) vegetation and the accumulation of that derived from the Brachiaria (C4) were followed by determining the 13C natural abundance of the soil organic matter (SOM). The pastures were established in 1987, 10 years deforestation, and it was estimated that until 1994 there was a loss in forest-derived C in the top 30 cm of soil of aproximately 20% (9.1mg C há-1). After the establishment of the pastures, C derived from Brachiaria accumulated steadily such that at the sampling (1997) it was estimated 13.9 Mg há -1 was derived from this source under the grass-only pasture(0-30 cm). Samples taken from all pastures and forest in 1997 to a depth of 100 cm showed that below 40 cm depth there was no significant contribution of the Brachiaria-derived C and that total C reserves under the gass/legume and the grass/only pastures were slig... Mostrar Tudo |
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Thesagro: |
Brachiaria Humidicola; Carbono; Nitrogênio; Pastagem. |
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Thesaurus Nal: |
carbon; nitrogen; pastures; soil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03038naa a2200313 a 4500
001 1598741
005 2007-05-31
008 2001 bl --- 0-- u #d
100 1 $aTARRE, R.
245 $aThe effect of the presence of a forage legume on nitrogen and carbon levels in soils under Brachiaria pastures in the Atlantic forest region of the South of Bahia, Brazil.
260 $c2001
520 $aThe impact of forest clearance, and its replacement by Brachiaria pasture, on soil carbon reserves has been studied at amny sites in the Brazilian Amazonian, but to date there appear to be no reports of similar studies undertaker in the Atlantic forest region of Brazil. In this study performed in the extreme south of Bahia, the chance in C and N content of the soil were evaluted from the time of establishment of grass-only B. humidicola and mixed B. humidicola/Desmodium ovolifolium pastures through 9 years of grazing in comparision with the C and N contents of the adjacent secondary forest. The decline in the content of soil C derived from the forest(C3) vegetation and the accumulation of that derived from the Brachiaria (C4) were followed by determining the 13C natural abundance of the soil organic matter (SOM). The pastures were established in 1987, 10 years deforestation, and it was estimated that until 1994 there was a loss in forest-derived C in the top 30 cm of soil of aproximately 20% (9.1mg C há-1). After the establishment of the pastures, C derived from Brachiaria accumulated steadily such that at the sampling (1997) it was estimated 13.9 Mg há -1 was derived from this source under the grass-only pasture(0-30 cm). Samples taken from all pastures and forest in 1997 to a depth of 100 cm showed that below 40 cm depth there was no significant contribution of the Brachiaria-derived C and that total C reserves under the gass/legume and the grass/only pastures were slightly higher than under the forest(not significant at p=0.05). The more metailed sampling under the pasture showed that to a depth of 30 cm there was significanly (P-0.050 more C under the mixed pasture than the grass-only pasture. It was estimated that from the time of establishment the apparent rate of C accumulation (0-100 cm depth) under the grass/legume pastures (1.17 Mg há -1 yr -1) was almost double that under the grass-only pastuires(0.66 Mg há-1 yr-1). The data indicated that newly incorporated SOM derived from the Brachiaria had a considerably higher C:N retio than that present under the forest. Nitrogênio N; Carbono C
650 $acarbon
650 $anitrogen
650 $apastures
650 $asoil
650 $aBrachiaria Humidicola
650 $aCarbono
650 $aNitrogênio
650 $aPastagem
700 1 $aMACEDO, R.
700 1 $aCANTARUTTI, R. B.
700 1 $aREZENDE, C. D.
700 1 $aPEREIRA, J. M.
700 1 $aFERREIRA, E.
700 1 $aALVES, B. J. R.
700 1 $aURQUIAGA, S.
700 1 $aBODDEY, R. M.
773 $tPlant and Soil, Dordrecht$gv. 234, n .1, p. 15-26, 2001.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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Registro Completo
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
12/12/2022 |
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Data da última atualização: |
12/12/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
PEDROSA, M. W.; UZEDA, M. C.; RODRIGUES, D.; ASSUNÇÃO, W. M. |
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Afiliação: |
MARINALVA WOODS PEDROSA, EPAMIG; MARIELLA CAMARDELLI UZEDA, CNPAB; DIANA RODRIGUES, UFMG; WANESSA MARINHO ASSUNÇÃO, CTA-ZM. |
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Título: |
Segurança alimentar e hortaliças PANC. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Informe Agropecuário, v. 43, n. 18, Hortaliças PANC: raízes e rizomas, v. 43, n. 18, p. 7-19, 2022. |
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Idioma: |
Português |
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Conteúdo: |
O termo, segurança alimentar, surgiu inicialmente como estratégia em tempos de guerra. Atualmente, com a busca do equilíbrio social no acesso à alimentação, esse termo passou a ser segurança alimentar e nutricional. Nesse contexto, os avanços das fronteiras agrícolas, tendo em vista os objetivos iniciais, têm demonstrado não ser o suficiente para que o alimento, em quantidade e qualidade, seja produzido e distribuído à população, de modo que a história da alimentação e da fome indica a necessidade de outros avanços. Estes envolvem a elaboração e execução de políticas públicas condizentes e efetivas, as quais devem estar atreladas a pesquisas para a geração de tecnologias de produção e distribuição de alimentos saudáveis, a processos educativos e a atuações da assistência técnica e extensão rural. As ações, assim conduzidas, devem proporcionar a valorização e o respeito à agricultura familiar e aos costumes alimentares regionais. Os trabalhos com as hortaliças não convencionais ou plantas alimentícias não convencionais têm demonstrado ser uma ferramenta que contribui para o acesso a alimentos de qualidade, favorecendo as cadeias curtas de produção e de comercialização, fortalecendo os mercados locais e promovendo aspectos bioculturais regionais. |
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Palavras-Chave: |
ODS; Unconventional food plants. |
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Thesaurus NAL: |
Food sovereignty; Nutrition; Public policy. |
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Categoria do assunto: |
Q Alimentos e Nutrição Humana |
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Marc: |
LEADER 01950naa a2200217 a 4500
001 2149455
005 2022-12-12
008 2022 bl uuuu u00u1 u #d
100 1 $aPEDROSA, M. W.
245 $aSegurança alimentar e hortaliças PANC.$h[electronic resource]
260 $c2022
520 $aO termo, segurança alimentar, surgiu inicialmente como estratégia em tempos de guerra. Atualmente, com a busca do equilíbrio social no acesso à alimentação, esse termo passou a ser segurança alimentar e nutricional. Nesse contexto, os avanços das fronteiras agrícolas, tendo em vista os objetivos iniciais, têm demonstrado não ser o suficiente para que o alimento, em quantidade e qualidade, seja produzido e distribuído à população, de modo que a história da alimentação e da fome indica a necessidade de outros avanços. Estes envolvem a elaboração e execução de políticas públicas condizentes e efetivas, as quais devem estar atreladas a pesquisas para a geração de tecnologias de produção e distribuição de alimentos saudáveis, a processos educativos e a atuações da assistência técnica e extensão rural. As ações, assim conduzidas, devem proporcionar a valorização e o respeito à agricultura familiar e aos costumes alimentares regionais. Os trabalhos com as hortaliças não convencionais ou plantas alimentícias não convencionais têm demonstrado ser uma ferramenta que contribui para o acesso a alimentos de qualidade, favorecendo as cadeias curtas de produção e de comercialização, fortalecendo os mercados locais e promovendo aspectos bioculturais regionais.
650 $aFood sovereignty
650 $aNutrition
650 $aPublic policy
653 $aODS
653 $aUnconventional food plants
700 1 $aUZEDA, M. C.
700 1 $aRODRIGUES, D.
700 1 $aASSUNÇÃO, W. M.
773 $tInforme Agropecuário$gv. 43, n. 18, Hortaliças PANC: raízes e rizomas, v. 43, n. 18, p. 7-19, 2022.
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