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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
14/05/1999 |
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Data da última atualização: |
14/05/1999 |
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Autoria: |
MORI, S. A.; SILVA, L. A. M. |
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Título: |
The herbarium of the Centro de Pesquisas do Cacau at Itabuna, Brazil. |
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Ano de publicação: |
1979 |
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Fonte/Imprenta: |
Brittonia, v.31, n.2, p.177-196, 1979. |
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Idioma: |
Inglês |
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Conteúdo: |
Although the herbarium of the " Centro de Pesquisas do Cacau " ( CEPEC ) has been in existence since 1965 contains nearly 15,000 specimens , it is not cited in Index Herbariorumum ( Holmgren & Keuken, 1974, 1976, 1977, 1978 ). Nearly all of its collections come from southern Bahia, a region poorly represented in other herbaria. The purpose of this paper is to provide geographic data about the cocoa-producing region, to give a brief introduction to CEPEC and its mother organization the Comissão Executiva do Plano da Lavoura Cacaueira ( CEPEC ), to give a history of botanical exploration carried out under the auspices of CEPEC, to summarize the most important projects of the CEPEC, herbarium, and to describe the major vegetation types of the region. It is hoped that information will enable taxonomists to utilize better the collections from this region and will encourage more detailed studies of its flora. |
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Palavras-Chave: |
Brasil; Herbarium; Itabuna. |
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Thesagro: |
Botânica; Herbário. |
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Thesaurus Nal: |
botany; Brazil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01457naa a2200217 a 4500
001 1795972
005 1999-05-14
008 1979 bl --- 0-- u #d
100 1 $aMORI, S. A.
245 $aThe herbarium of the Centro de Pesquisas do Cacau at Itabuna, Brazil.
260 $c1979
520 $aAlthough the herbarium of the " Centro de Pesquisas do Cacau " ( CEPEC ) has been in existence since 1965 contains nearly 15,000 specimens , it is not cited in Index Herbariorumum ( Holmgren & Keuken, 1974, 1976, 1977, 1978 ). Nearly all of its collections come from southern Bahia, a region poorly represented in other herbaria. The purpose of this paper is to provide geographic data about the cocoa-producing region, to give a brief introduction to CEPEC and its mother organization the Comissão Executiva do Plano da Lavoura Cacaueira ( CEPEC ), to give a history of botanical exploration carried out under the auspices of CEPEC, to summarize the most important projects of the CEPEC, herbarium, and to describe the major vegetation types of the region. It is hoped that information will enable taxonomists to utilize better the collections from this region and will encourage more detailed studies of its flora.
650 $abotany
650 $aBrazil
650 $aBotânica
650 $aHerbário
653 $aBrasil
653 $aHerbarium
653 $aItabuna
700 1 $aSILVA, L. A. M.
773 $tBrittonia$gv.31, n.2, p.177-196, 1979.
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Registro original: |
Embrapa Pantanal (CPAP) |
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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: |
06/02/2018 |
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Data da última atualização: |
30/10/2018 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
GOMES, E. T. M.; BERBARA, R. L. L.; PEREIRA, M. G.; URQUIAGA, S.; TAVARES, O. C. H.; ASSUNÇÃO, S. A.; ZONTA, E.; AMARAL SOBRINHO, N. M. do; GARCPUAM A, C. |
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Afiliação: |
ERNANE TARCÍSIO MARTINS GOMES, UFRRJ; RICARDO LUIS LOURO BERBARA, UFRRJ; MARCOS GERVASIO PEREIRA, UFRRJ; SEGUNDO SACRAMENTO U CABALLERO, CNPAB; ORLANDO CARLOS HUERTAS TAVARES, UFRRJ; SHIRLEI ALMEIDA ASSUNÇÃO, UFRRJ; EVERALDO ZONTA, UFRRJ; NELSON MOURA BRASIL DO AMARAL SOBRINHO, UFRRJ; ANDRÉS CALDERÍN GARCÍA, UFRRJ. |
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Título: |
Effects of farmed managements in sandy soils on composition and stabilization of soil humic substances. |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
Land Degradation & Development, v. 29, n. 1, p. 68-79, 2018. |
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DOI: |
10.1002/ldr.2839 |
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Idioma: |
Inglês |
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Conteúdo: |
Sandy soils in tropical climates with low organic matter (OM) content result in degradation and fertility loss. It is important to note that humified OM accumulation and stabilization increases soil fertility. This study aimed to characterize humic acids (HAs) in sandy soils on an agroecological farm operating for more than 20years. The structures of the HA of two Planosols under a grazing (G) and crop rotation (R) management system and of an Acrisol under an agroforestry management system (AFS) were characterized using HA extracted from a local Organosol under cassava monoculture (M) as a structural reference. Lower C-HA/C-FA ratio in sandy soil reveals a slightly humified OM and higher E-4/E-6 ratio value in HA confirming lower aromatic structure condensation. The HA in Planosols (R and G) and Acrisols (AFS) are predominantly formed by C-Alq-O,C-N-, CAlq-O-, and CAlq-di-O structures closely related to the soil physical properties and preserved by interaction with the mineral fraction confirmed by O-H, Si-O stretching of kaolinite and hematite bands in FTIR spectroscopy. Management and vegetal carbon type (-20.65 parts per thousand AFS -C-3) or (-15.55 parts per thousand (G) and -17.82 parts per thousand (R) -C-4) had no effect on HA formation. Evolution of structural change in HA modeled by chemometric analyses showed that more recalcitrant structure characteristic in HA can enhance OM preservation in these sandy soils. This study elucidated the OM stabilization mechanisms of sandy soil HA, their relationship with soil properties and models structural changes for humified OM recovery and preservation, which contribute to increased fertility and agricultural production. MenosSandy soils in tropical climates with low organic matter (OM) content result in degradation and fertility loss. It is important to note that humified OM accumulation and stabilization increases soil fertility. This study aimed to characterize humic acids (HAs) in sandy soils on an agroecological farm operating for more than 20years. The structures of the HA of two Planosols under a grazing (G) and crop rotation (R) management system and of an Acrisol under an agroforestry management system (AFS) were characterized using HA extracted from a local Organosol under cassava monoculture (M) as a structural reference. Lower C-HA/C-FA ratio in sandy soil reveals a slightly humified OM and higher E-4/E-6 ratio value in HA confirming lower aromatic structure condensation. The HA in Planosols (R and G) and Acrisols (AFS) are predominantly formed by C-Alq-O,C-N-, CAlq-O-, and CAlq-di-O structures closely related to the soil physical properties and preserved by interaction with the mineral fraction confirmed by O-H, Si-O stretching of kaolinite and hematite bands in FTIR spectroscopy. Management and vegetal carbon type (-20.65 parts per thousand AFS -C-3) or (-15.55 parts per thousand (G) and -17.82 parts per thousand (R) -C-4) had no effect on HA formation. Evolution of structural change in HA modeled by chemometric analyses showed that more recalcitrant structure characteristic in HA can enhance OM preservation in these sandy soils. This study elucidated the OM stabilization mechanisms... Mostrar Tudo |
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Palavras-Chave: |
Organic agriculture; Sandy soil; Soil preservation. |
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Thesaurus NAL: |
humic acids; soil organic matter. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02571naa a2200289 a 4500
001 2087206
005 2018-10-30
008 2018 bl uuuu u00u1 u #d
024 7 $a10.1002/ldr.2839$2DOI
100 1 $aGOMES, E. T. M.
245 $aEffects of farmed managements in sandy soils on composition and stabilization of soil humic substances.$h[electronic resource]
260 $c2018
520 $aSandy soils in tropical climates with low organic matter (OM) content result in degradation and fertility loss. It is important to note that humified OM accumulation and stabilization increases soil fertility. This study aimed to characterize humic acids (HAs) in sandy soils on an agroecological farm operating for more than 20years. The structures of the HA of two Planosols under a grazing (G) and crop rotation (R) management system and of an Acrisol under an agroforestry management system (AFS) were characterized using HA extracted from a local Organosol under cassava monoculture (M) as a structural reference. Lower C-HA/C-FA ratio in sandy soil reveals a slightly humified OM and higher E-4/E-6 ratio value in HA confirming lower aromatic structure condensation. The HA in Planosols (R and G) and Acrisols (AFS) are predominantly formed by C-Alq-O,C-N-, CAlq-O-, and CAlq-di-O structures closely related to the soil physical properties and preserved by interaction with the mineral fraction confirmed by O-H, Si-O stretching of kaolinite and hematite bands in FTIR spectroscopy. Management and vegetal carbon type (-20.65 parts per thousand AFS -C-3) or (-15.55 parts per thousand (G) and -17.82 parts per thousand (R) -C-4) had no effect on HA formation. Evolution of structural change in HA modeled by chemometric analyses showed that more recalcitrant structure characteristic in HA can enhance OM preservation in these sandy soils. This study elucidated the OM stabilization mechanisms of sandy soil HA, their relationship with soil properties and models structural changes for humified OM recovery and preservation, which contribute to increased fertility and agricultural production.
650 $ahumic acids
650 $asoil organic matter
653 $aOrganic agriculture
653 $aSandy soil
653 $aSoil preservation
700 1 $aBERBARA, R. L. L.
700 1 $aPEREIRA, M. G.
700 1 $aURQUIAGA, S.
700 1 $aTAVARES, O. C. H.
700 1 $aASSUNÇÃO, S. A.
700 1 $aZONTA, E.
700 1 $aAMARAL SOBRINHO, N. M. do
700 1 $aGARCPUAM A, C.
773 $tLand Degradation & Development$gv. 29, n. 1, p. 68-79, 2018.
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