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 | Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Oriental. Para informações adicionais entre em contato com cpatu.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
08/08/1997 |
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Data da última atualização: |
18/03/2014 |
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Autoria: |
SILVA, J. N. M.; CARVALHO, J. O. P. de; LOPES, J. do C. A.; ALMEIDA, B. F. de; COSTA, D. H. M.; OLIVEIRA, L. C. de; VANCLAY, J. K.; SKOVSGAARD, J. P. |
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Afiliação: |
JOSÉ NATALINO MACEDO SILVA, CPATU; JOÃO OLEGÁRIO PEREIRA DE CARVALHO, CPATU; JOSE DO CARMO ALVES LOPES, CPATU; CPATU; CPATU; FCAP; ROYAL VETERINARY AND AGRICULTURAL UNIVERSITY; DANISH FOREST AND LANDSCAPE RESEARCH INSTITUTE. |
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Título: |
Growth and yield of a tropical rain forest in the Brazilian Amazon 13 years after logging. |
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Ano de publicação: |
1995 |
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Fonte/Imprenta: |
Forest Ecology and Management, v. 71, n. 3, p. 267-274, Feb. 1995. |
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DOI: |
http://dx.doi.org/10.1016/0378-1127(94)06106-S |
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Idioma: |
Inglês |
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Conteúdo: |
Successive inventories of a silvicultural experiment in terra firme rain forest within the Tapajós National Forest in the Brazilian Amazon are examined to provide guidelines for operational forest management on a sustainable basis. The experiment was logged in 1979 without additional silvicultural treatment, but included protection from further logging and encroachment ("log and leave"). Thirty-six permanent plots established in 1981 were remeasured in 1987 and 1992. Logging changed the canopy structure and altered the composition of the stand, reducing the number of shade tolerant species and stimulating light demanding species. There was a net increase in stem number and stand basal area during the 11 year observation period, and this trend also holds for most of the individual species. The stand basal area 13 years after logging was about 75% of that in a comparable unlogged forest. Logging stimulated growth, but this effect was short-lived, lasting only about 3 years, and current growth rates are similar to those in the unlogged forest. Between the first and second remeasures, average diameter increment decreased from 0.4 to 0.2 cm year;1, mortality remained relatively constant at 2.5% year;1, while recruitment (at 5 cm diameter at breast height) decreased from 5 to 2%. Total volume production declined from approximately 6 to 4 m3 ha;1 year;1, while commercial production remained about 0.8 m3 ha;1 year;1. New commercial species increased the commercial volume in 1992 from 18 to 54 m3 ha−1, and the increment to 1.8 m3 ha;1 year;1. Results from this experiment provide the first quantitative information for management planning in the Tapajós Forest, and may guide the choice of cutting cycle and annual allowable cut. Silvicultural treatment to stimulate growth rates in forest areas zoned for timber production should be considered as a viable management option. Extrapolations of these results to an anticipated 30?35 year cutting cycle must be interpreted with caution. Ongoing remeasurement and analysis of these and other plots over the next 30 years or more are necessary to provide a stronger basis for management inferences. MenosSuccessive inventories of a silvicultural experiment in terra firme rain forest within the Tapajós National Forest in the Brazilian Amazon are examined to provide guidelines for operational forest management on a sustainable basis. The experiment was logged in 1979 without additional silvicultural treatment, but included protection from further logging and encroachment ("log and leave"). Thirty-six permanent plots established in 1981 were remeasured in 1987 and 1992. Logging changed the canopy structure and altered the composition of the stand, reducing the number of shade tolerant species and stimulating light demanding species. There was a net increase in stem number and stand basal area during the 11 year observation period, and this trend also holds for most of the individual species. The stand basal area 13 years after logging was about 75% of that in a comparable unlogged forest. Logging stimulated growth, but this effect was short-lived, lasting only about 3 years, and current growth rates are similar to those in the unlogged forest. Between the first and second remeasures, average diameter increment decreased from 0.4 to 0.2 cm year;1, mortality remained relatively constant at 2.5% year;1, while recruitment (at 5 cm diameter at breast height) decreased from 5 to 2%. Total volume production declined from approximately 6 to 4 m3 ha;1 year;1, while commercial production remained about 0.8 m3 ha;1 year;1. New commercial species increased the commercial volume in 1992 fro... Mostrar Tudo |
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Palavras-Chave: |
Brasil; Floresta chuvosa; Floresta de terra firme; Manejo florestal sustentável; Sustainability. |
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Thesagro: |
Extração da Madeira; Silvicultura. |
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Thesaurus Nal: |
Amazonia; logging; rain forests; silviculture. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03205naa a2200349 a 4500
001 1397269
005 2014-03-18
008 1995 bl uuuu u00u1 u #d
024 7 $ahttp://dx.doi.org/10.1016/0378-1127(94)06106-S$2DOI
100 1 $aSILVA, J. N. M.
245 $aGrowth and yield of a tropical rain forest in the Brazilian Amazon 13 years after logging.
260 $c1995
520 $aSuccessive inventories of a silvicultural experiment in terra firme rain forest within the Tapajós National Forest in the Brazilian Amazon are examined to provide guidelines for operational forest management on a sustainable basis. The experiment was logged in 1979 without additional silvicultural treatment, but included protection from further logging and encroachment ("log and leave"). Thirty-six permanent plots established in 1981 were remeasured in 1987 and 1992. Logging changed the canopy structure and altered the composition of the stand, reducing the number of shade tolerant species and stimulating light demanding species. There was a net increase in stem number and stand basal area during the 11 year observation period, and this trend also holds for most of the individual species. The stand basal area 13 years after logging was about 75% of that in a comparable unlogged forest. Logging stimulated growth, but this effect was short-lived, lasting only about 3 years, and current growth rates are similar to those in the unlogged forest. Between the first and second remeasures, average diameter increment decreased from 0.4 to 0.2 cm year;1, mortality remained relatively constant at 2.5% year;1, while recruitment (at 5 cm diameter at breast height) decreased from 5 to 2%. Total volume production declined from approximately 6 to 4 m3 ha;1 year;1, while commercial production remained about 0.8 m3 ha;1 year;1. New commercial species increased the commercial volume in 1992 from 18 to 54 m3 ha−1, and the increment to 1.8 m3 ha;1 year;1. Results from this experiment provide the first quantitative information for management planning in the Tapajós Forest, and may guide the choice of cutting cycle and annual allowable cut. Silvicultural treatment to stimulate growth rates in forest areas zoned for timber production should be considered as a viable management option. Extrapolations of these results to an anticipated 30?35 year cutting cycle must be interpreted with caution. Ongoing remeasurement and analysis of these and other plots over the next 30 years or more are necessary to provide a stronger basis for management inferences.
650 $aAmazonia
650 $alogging
650 $arain forests
650 $asilviculture
650 $aExtração da Madeira
650 $aSilvicultura
653 $aBrasil
653 $aFloresta chuvosa
653 $aFloresta de terra firme
653 $aManejo florestal sustentável
653 $aSustainability
700 1 $aCARVALHO, J. O. P. de
700 1 $aLOPES, J. do C. A.
700 1 $aALMEIDA, B. F. de
700 1 $aCOSTA, D. H. M.
700 1 $aOLIVEIRA, L. C. de
700 1 $aVANCLAY, J. K.
700 1 $aSKOVSGAARD, J. P.
773 $tForest Ecology and Management$gv. 71, n. 3, p. 267-274, Feb. 1995.
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Embrapa Amazônia Oriental (CPATU) |
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
28/09/1998 |
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Data da última atualização: |
08/04/2021 |
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Autoria: |
AQUINO, S. F. de; NUNES, R. de P. |
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Título: |
Estrutura genética de populações de caupi e suas implicações no melhoramento genético através da seleção. |
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Ano de publicação: |
1983 |
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Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, v.18, n.4, p. 399-412. abr. 1983. |
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Idioma: |
Português |
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Notas: |
Título em inglês: Genetical structure of cowpea populations and its implication on the genetic improvement through selection. |
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Conteúdo: |
RESUMO - Duas hipóteses sobre a estrutura genética de populações e variedades de feijao-de-corda (caupi), Vigna unguiculata (L.) Walp, foram testadas através de modelos matemáticos distintos. A variabilidade genética de duas cultivares foi estudada com respeito aos diversos componentes dos modelos propostos, com vistas ao estabelecimento de procedimentos mais eficientes para a seleção. O número de gerações em que é possível a obtenção de progresso genético para vários componentes da produção foi estabelecido em função de três diferentes métodos de seleção. ABSTRACT - Two hypothesis about the genetical structure of varieties and populations of cowpea, Vigna unguiculata (L.) Walp, were tested under the assumption of two different mathematical models. Genetic variability of two cultivars were studied in respect to the terms of the assurned models, and componente of genetic variance were estimated. The number of generations for which genetic advance is achieved under three different selection procedures was determined for several yield components. |
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Thesagro: |
Feijão de Corda; Melhoramento Genético Vegetal; Modelo Matemático; Variedade; Vigna Unguiculata. |
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Thesaurus NAL: |
Cultivars; Genetic improvement; Genetic variation; Mathematical models; Population genetics; Yield components. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/222436/1/Estrutura-genetica-populacoes-1983.pdf
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Marc: |
LEADER 02057naa a2200277 a 4500
001 1104974
005 2021-04-08
008 1983 bl uuuu u00u1 u #d
100 1 $aAQUINO, S. F. de
245 $aEstrutura genética de populações de caupi e suas implicações no melhoramento genético através da seleção.
260 $c1983
500 $aTítulo em inglês: Genetical structure of cowpea populations and its implication on the genetic improvement through selection.
520 $aRESUMO - Duas hipóteses sobre a estrutura genética de populações e variedades de feijao-de-corda (caupi), Vigna unguiculata (L.) Walp, foram testadas através de modelos matemáticos distintos. A variabilidade genética de duas cultivares foi estudada com respeito aos diversos componentes dos modelos propostos, com vistas ao estabelecimento de procedimentos mais eficientes para a seleção. O número de gerações em que é possível a obtenção de progresso genético para vários componentes da produção foi estabelecido em função de três diferentes métodos de seleção. ABSTRACT - Two hypothesis about the genetical structure of varieties and populations of cowpea, Vigna unguiculata (L.) Walp, were tested under the assumption of two different mathematical models. Genetic variability of two cultivars were studied in respect to the terms of the assurned models, and componente of genetic variance were estimated. The number of generations for which genetic advance is achieved under three different selection procedures was determined for several yield components.
650 $aCultivars
650 $aGenetic improvement
650 $aGenetic variation
650 $aMathematical models
650 $aPopulation genetics
650 $aYield components
650 $aFeijão de Corda
650 $aMelhoramento Genético Vegetal
650 $aModelo Matemático
650 $aVariedade
650 $aVigna Unguiculata
700 1 $aNUNES, R. de P.
773 $tPesquisa Agropecuária Brasileira, Brasília$gv.18, n.4, p. 399-412. abr. 1983.
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