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Registro Completo |
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
22/11/2002 |
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Data da última atualização: |
22/11/2002 |
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Autoria: |
SALDARRIAGA, J. G.; UHL, C. |
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Título: |
Recovery of forest vegetation following slash-and-burn agriculture in the Upper Rio Negro |
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Ano de publicação: |
1991 |
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Fonte/Imprenta: |
In: GOMEZ-POMPA, A.; WHITMORE, T.C.; HADLEY, M. Rain forest regeneration and management. Paris: UNESCO/Parthenon Publishing, 1991. (Man and the biophere series, v.6). |
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Páginas: |
p.303-312 |
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Idioma: |
Inglês |
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Conteúdo: |
Changes in species composition, forest structure and biomass have been studied at 24 tropical forest sites along the Upper Rio Negro region of Colombia and Venezuela. Stands were selected from the tierra firme forests (non-flooded) to represent a chronosequence of succession following slash-and-burn agricultural practices. After abandonment, the number of species increases from early successional to mature forests. The speciescomposition of the mature forests depends on a small fraction of primary species that survive from early stages of succession and on the introduction of many primary species at later stages of succession. Small areas disturbed by slash-and-burn agriculture recover their original species composition, but the time required varies, dependingon the intensity and frequency of disturbance in the area. On a large scale, the forest is a mosaic of different aged patches and structural characteristics, with high variability among stands, depending on soils, micro-relief, species composition, and disturbance dynamics. Approximately 140-200 years is required for an abandoned farm to attain the biomass values comparable to those of a mature forest. Recovery is thus five to seven times longer in the Upper Rio Negro than in other tropical areas in South America. |
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Thesagro: |
Conservação; Ecologia; Floresta Tropical; Manejo; Silvicultura. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01964naa a2200205 a 4500
001 1327859
005 2002-11-22
008 1991 bl uuuu u00u1 u #d
100 1 $aSALDARRIAGA, J. G.
245 $aRecovery of forest vegetation following slash-and-burn agriculture in the Upper Rio Negro
260 $c1991
300 $ap.303-312
520 $aChanges in species composition, forest structure and biomass have been studied at 24 tropical forest sites along the Upper Rio Negro region of Colombia and Venezuela. Stands were selected from the tierra firme forests (non-flooded) to represent a chronosequence of succession following slash-and-burn agricultural practices. After abandonment, the number of species increases from early successional to mature forests. The speciescomposition of the mature forests depends on a small fraction of primary species that survive from early stages of succession and on the introduction of many primary species at later stages of succession. Small areas disturbed by slash-and-burn agriculture recover their original species composition, but the time required varies, dependingon the intensity and frequency of disturbance in the area. On a large scale, the forest is a mosaic of different aged patches and structural characteristics, with high variability among stands, depending on soils, micro-relief, species composition, and disturbance dynamics. Approximately 140-200 years is required for an abandoned farm to attain the biomass values comparable to those of a mature forest. Recovery is thus five to seven times longer in the Upper Rio Negro than in other tropical areas in South America.
650 $aConservação
650 $aEcologia
650 $aFloresta Tropical
650 $aManejo
650 $aSilvicultura
700 1 $aUHL, C.
773 $tIn: GOMEZ-POMPA, A.; WHITMORE, T.C.; HADLEY, M. Rain forest regeneration and management. Paris: UNESCO/Parthenon Publishing, 1991. (Man and the biophere series$gv.6).
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Embrapa Solos (CNPS) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Soja. Para informações adicionais entre em contato com valeria.cardoso@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
06/10/1992 |
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Data da última atualização: |
23/04/2012 |
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Autoria: |
HENNING, A. A.; FRANCA NETO, J. B. |
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Afiliação: |
EMBRAPA-CNPSo, Londrina, PR. |
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Título: |
Control of Sclerotinia sclerotiorum (Lib.) de Bary and Alternaria spp. in sunflower seeds. |
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Ano de publicação: |
1985 |
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Fonte/Imprenta: |
In: CONFERENCIA INTERNACIONAL DE GIRASOL, 11., 1985, Mar del Plata, Actas. Mar del Plata: ASAGIR/ISA, 1985. |
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Volume: |
t.2 |
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Páginas: |
p.375-378. |
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Idioma: |
Inglês |
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Conteúdo: |
The efficiency of seed treatment with different fungicides and mixtures was evaluated for the control of Sclerotinia sclerotiorum and Alternaria spp. in sunflower seeds. Achenes of the hybrid Contissol infected with S. sclerotiorum were treated with the following fungicides: benomyl (Benlate 50 WP) 3.5g a.i./kg; carboxin (Vitavax 75 WP) 5.25g a.i./kg; thiabendazol (Tecto 10) 1.4g a.i./kg; thiabendazol 1.4g a.i./kg + carboxin 5.25g a.i./kg; thiabendazol 0.7g a.i./kg + carboxin 2.625g a.i./kg. The treatments were evaluated by the blotter test, PDA and emergence in greenhouse. High levels of S. sclerotiorum and Alternaria spp. were observed in the untreated seeds in PDA and blotter. Carboxin 5.25g a.i. drastically reduced Alternaria spp. but had no effect on S. erotiorum. Thiabendazol 1.4g and benomyl 3.5g efficiently controlled S. sclerotiorum, but did not affect Alternaria spp. The mixture thiabendazol 1.4g + carboxin 5.25g was very effective in controlling the pathogens, and resulted in the best seed emergence index in greenhouse. Half dosage treatments were not efficient in controlling the pathogens. Based on the results, seed treatment with the misture thiabendazol 1.4g + carboxin 5.25g is the most efficient way of reducing seed transmission and dissemination of those pathogens. |
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Palavras-Chave: |
Alternaria spp; Brasil; Disease; Fitopatologia; Fungus; Phytopathology; Sedd; Sunflower; Treatment; Trtamento. |
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Thesagro: |
Doença; Fungo; Girassol; Sclerotinia Sclerotiorum; Semente. |
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Thesaurus NAL: |
Brazil. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02229naa a2200349 a 4500
001 1453031
005 2012-04-23
008 1985 bl uuuu u00u1 u #d
100 1 $aHENNING, A. A.
245 $aControl of Sclerotinia sclerotiorum (Lib.) de Bary and Alternaria spp. in sunflower seeds.
260 $c1985
300 $ap.375-378. t.2
490 $vt.2
520 $aThe efficiency of seed treatment with different fungicides and mixtures was evaluated for the control of Sclerotinia sclerotiorum and Alternaria spp. in sunflower seeds. Achenes of the hybrid Contissol infected with S. sclerotiorum were treated with the following fungicides: benomyl (Benlate 50 WP) 3.5g a.i./kg; carboxin (Vitavax 75 WP) 5.25g a.i./kg; thiabendazol (Tecto 10) 1.4g a.i./kg; thiabendazol 1.4g a.i./kg + carboxin 5.25g a.i./kg; thiabendazol 0.7g a.i./kg + carboxin 2.625g a.i./kg. The treatments were evaluated by the blotter test, PDA and emergence in greenhouse. High levels of S. sclerotiorum and Alternaria spp. were observed in the untreated seeds in PDA and blotter. Carboxin 5.25g a.i. drastically reduced Alternaria spp. but had no effect on S. erotiorum. Thiabendazol 1.4g and benomyl 3.5g efficiently controlled S. sclerotiorum, but did not affect Alternaria spp. The mixture thiabendazol 1.4g + carboxin 5.25g was very effective in controlling the pathogens, and resulted in the best seed emergence index in greenhouse. Half dosage treatments were not efficient in controlling the pathogens. Based on the results, seed treatment with the misture thiabendazol 1.4g + carboxin 5.25g is the most efficient way of reducing seed transmission and dissemination of those pathogens.
650 $aBrazil
650 $aDoença
650 $aFungo
650 $aGirassol
650 $aSclerotinia Sclerotiorum
650 $aSemente
653 $aAlternaria spp
653 $aBrasil
653 $aDisease
653 $aFitopatologia
653 $aFungus
653 $aPhytopathology
653 $aSedd
653 $aSunflower
653 $aTreatment
653 $aTrtamento
700 1 $aFRANCA NETO, J. B.
773 $tIn: CONFERENCIA INTERNACIONAL DE GIRASOL, 11., 1985, Mar del Plata, Actas. Mar del Plata: ASAGIR/ISA, 1985.
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