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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: |
14/03/2009 |
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Data da última atualização: |
22/11/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
GROGAN, J.; JENNINGS, S. B.; LANDIS, R. M.; SCHULZE, M.; BAIMA, A. M. V.; LOPES, J. do C. A.; NORGHAUER, J. M.; OLIVEIRA, L. R.; PANTOJA, F.; PINTO, D.; SILVA, J. N. M.; VIDAL, E.; ZIMMERMAN, B. L. |
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Afiliação: |
James Grogan, Imazon; Stephen B. Jennings, Global Advisor Livelihood; R. Matthew Landis, Middlebury College; Mark Schulze, Imazon; Anadilza M.V. Baima, APEF; JOSE DO CARMO ALVES LOPES, CPATU; Julian M. Norghauer, University of Toronto; L. Rogério Oliveira, AgroFlorestal Donadoni; Frank Pantoja, Imazon; Diane Pinto, University of Toronto; Jose Natalino M. Silva, CPATU; Edson Vidal, Imazon; Barbara L. Zimmerman, Brazil Program. |
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Título: |
What loggers leave behind: Impacts on big-leaf mahogany (Swietenia macrophylla) commercial populations and potential for post-logging recovery in the Brazilian Amazon. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
Forest Ecology and Management, v. 255, n. 2, p. 269-281, Mar. 2008. |
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DOI: |
10.1016/j.foreco.2007.09.048 |
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Idioma: |
Inglês |
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Conteúdo: |
The sustainability of current harvest practices for high-value Meliaceae can be assessed by quantifying logging intensity and projecting growth and survival by post-logging populations over anticipated intervals between harvests. From 100%-area inventories of big-leaf mahogany (Swietenia macrophylla) covering 204 ha or more at eight logged and unlogged forest sites across southern Brazilian Amazonia, we report generally higher landscape-scale densities and smaller population-level mean diameters in eastern forests compared to western forests, where most commercial stocks survive. Density of trees ?20 cm diameter varied by two orders of magnitude and peaked at 1.17 ha?1. Size class frequency distributions appeared unimodal at two high-density sites, but were essentially amodal or flat elsewhere; diameter increment patterns indicate that populations were multi- or all-aged. At two high-density sites, conventional logging removed 93?95% of commercial trees (?45 cm diameter at the time of logging), illegally eliminated 31?47% of sub-merchantable trees, and targeted trees as small as 20 cm diameter. Projected recovery by commercial stems during 30 years after conventional logging represented 9.9?37.5% of initial densities and was highly dependent on initial logging intensity and size class frequency distributions of commercial trees. We simulated post-logging recovery over the same period at all sites according to the 2003 regulatory framework for mahogany in Brazil, which raised the minimum diameter cutting limit to 60 cm and requires retention during the first harvest of 20% of commercial-sized trees. Recovery during 30 years ranged from approximately 0 to 31% over 20% retention densities at seven of eight sites. At only one site where sub-merchantable trees dominated the population did the simulated density of harvestable stems after 30 years exceed initial commercial densities. These results indicate that 80% harvest intensity will not be sustainable over multiple cutting cycles for most populations without silvicultural interventions ensuring establishment and long-term growth of artificial regeneration to augment depleted natural stocks, including repeated tending of outplanted seedlings. Without improved harvest protocols for mahogany in Brazil as explored in this paper, future commercial supplies of this species as well as other high-value tropical timbers are endangered. Rapid changes in the timber industry and land-use in the Amazon are also significant challenges to sustainable management of mahogany. MenosThe sustainability of current harvest practices for high-value Meliaceae can be assessed by quantifying logging intensity and projecting growth and survival by post-logging populations over anticipated intervals between harvests. From 100%-area inventories of big-leaf mahogany (Swietenia macrophylla) covering 204 ha or more at eight logged and unlogged forest sites across southern Brazilian Amazonia, we report generally higher landscape-scale densities and smaller population-level mean diameters in eastern forests compared to western forests, where most commercial stocks survive. Density of trees ?20 cm diameter varied by two orders of magnitude and peaked at 1.17 ha?1. Size class frequency distributions appeared unimodal at two high-density sites, but were essentially amodal or flat elsewhere; diameter increment patterns indicate that populations were multi- or all-aged. At two high-density sites, conventional logging removed 93?95% of commercial trees (?45 cm diameter at the time of logging), illegally eliminated 31?47% of sub-merchantable trees, and targeted trees as small as 20 cm diameter. Projected recovery by commercial stems during 30 years after conventional logging represented 9.9?37.5% of initial densities and was highly dependent on initial logging intensity and size class frequency distributions of commercial trees. We simulated post-logging recovery over the same period at all sites according to the 2003 regulatory framework for mahogany in Brazil, which raised... Mostrar Tudo |
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Palavras-Chave: |
Brasil; População vegetal. |
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Thesagro: |
Floresta Tropical; Legislação; Reflorestamento. |
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Thesaurus Nal: |
Amazonia. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 03626naa a2200349 a 4500
001 1410041
005 2022-11-22
008 2008 bl uuuu u00u1 u #d
024 7 $a10.1016/j.foreco.2007.09.048$2DOI
100 1 $aGROGAN, J.
245 $aWhat loggers leave behind$bImpacts on big-leaf mahogany (Swietenia macrophylla) commercial populations and potential for post-logging recovery in the Brazilian Amazon.$h[electronic resource]
260 $c2008
520 $aThe sustainability of current harvest practices for high-value Meliaceae can be assessed by quantifying logging intensity and projecting growth and survival by post-logging populations over anticipated intervals between harvests. From 100%-area inventories of big-leaf mahogany (Swietenia macrophylla) covering 204 ha or more at eight logged and unlogged forest sites across southern Brazilian Amazonia, we report generally higher landscape-scale densities and smaller population-level mean diameters in eastern forests compared to western forests, where most commercial stocks survive. Density of trees ?20 cm diameter varied by two orders of magnitude and peaked at 1.17 ha?1. Size class frequency distributions appeared unimodal at two high-density sites, but were essentially amodal or flat elsewhere; diameter increment patterns indicate that populations were multi- or all-aged. At two high-density sites, conventional logging removed 93?95% of commercial trees (?45 cm diameter at the time of logging), illegally eliminated 31?47% of sub-merchantable trees, and targeted trees as small as 20 cm diameter. Projected recovery by commercial stems during 30 years after conventional logging represented 9.9?37.5% of initial densities and was highly dependent on initial logging intensity and size class frequency distributions of commercial trees. We simulated post-logging recovery over the same period at all sites according to the 2003 regulatory framework for mahogany in Brazil, which raised the minimum diameter cutting limit to 60 cm and requires retention during the first harvest of 20% of commercial-sized trees. Recovery during 30 years ranged from approximately 0 to 31% over 20% retention densities at seven of eight sites. At only one site where sub-merchantable trees dominated the population did the simulated density of harvestable stems after 30 years exceed initial commercial densities. These results indicate that 80% harvest intensity will not be sustainable over multiple cutting cycles for most populations without silvicultural interventions ensuring establishment and long-term growth of artificial regeneration to augment depleted natural stocks, including repeated tending of outplanted seedlings. Without improved harvest protocols for mahogany in Brazil as explored in this paper, future commercial supplies of this species as well as other high-value tropical timbers are endangered. Rapid changes in the timber industry and land-use in the Amazon are also significant challenges to sustainable management of mahogany.
650 $aAmazonia
650 $aFloresta Tropical
650 $aLegislação
650 $aReflorestamento
653 $aBrasil
653 $aPopulação vegetal
700 1 $aJENNINGS, S. B.
700 1 $aLANDIS, R. M.
700 1 $aSCHULZE, M.
700 1 $aBAIMA, A. M. V.
700 1 $aLOPES, J. do C. A.
700 1 $aNORGHAUER, J. M.
700 1 $aOLIVEIRA, L. R.
700 1 $aPANTOJA, F.
700 1 $aPINTO, D.
700 1 $aSILVA, J. N. M.
700 1 $aVIDAL, E.
700 1 $aZIMMERMAN, B. L.
773 $tForest Ecology and Management$gv. 255, n. 2, p. 269-281, Mar. 2008.
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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Registro Completo
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
16/12/2014 |
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Data da última atualização: |
16/02/2016 |
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Tipo da produção científica: |
Boletim de Pesquisa e Desenvolvimento |
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Autoria: |
OLIVEIRA, E. A. G. de; LEAL, M. A. de A.; ROCHA, M. dos S.; GUERRA, J. G. M.; RIBEIRO, R. de L. D. |
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Afiliação: |
EVA ADRIANA G. DE OLIVEIRA, UFRRJ; MARCO ANTONIO DE ALMEIDA LEAL, CNPAB; UFRRJ; JOSE GUILHERME MARINHO GUERRA, CNPAB; RAUL DE LUCENA DUARTE RIBEIRO, Professor aposentado UFRRJ. |
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Título: |
Avaliação da estabilidade de materiais orgânicos por meio de incubação e da captura conjunta das emissões de CO2 e de NH3. |
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Ano de publicação: |
2014 |
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Fonte/Imprenta: |
Seropédica: Embrapa Agrobiologia, 2014. |
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Páginas: |
32 p. |
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Idioma: |
Português |
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Notas: |
(Embrapa Agrobiologia. Boletim de Pesquisa e Desenvolvimento, 97). |
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Conteúdo: |
As emissões de CO2 e de NH3 são indicadores do nível de estabilidade de materiais orgânicos aos processos de decomposição. O objetivo deste trabalho foi avaliar a captura conjunta de CO2 e de NH3 em um único frasco de incubação. As emissões destes gases foram quantificadas das seguintes maneiras: 1- Captura conjunta de CO2 e de NH3; 2- Captura isolada de CO2; 3- Captura isolada de NH3. T. A emissão de NH3 obtidos nas incubações com captura conjunta diferiram dos resultados obtidos nas incubações com captura isolada. As análises de emissão de NH3 com captura isolada, sem a presença de NaOH no frasco de incubação, podem apresentar resultados subestimados, provavelmente devido ao efeito de acidificação da amostra promovido pelo acúmulo de CO2 no frasco de incubação. A presença de NaOH nas incubações reduz ou evita o acúmulo de CO2 e a consequente redução do pH das amostra, o que torna os resultados de emissão de NH3 mais próximos aos que seriam encontrados em ambiente aberto. |
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Palavras-Chave: |
Respirometria; Volatização de amônia. |
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Thesagro: |
Composto Orgânico; Decomposição. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/126120/1/BOP-97-corrigido.pdf
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Marc: |
LEADER 01777nam a2200229 a 4500
001 2002664
005 2016-02-16
008 2014 bl uuuu u0uu1 u #d
100 1 $aOLIVEIRA, E. A. G. de
245 $aAvaliação da estabilidade de materiais orgânicos por meio de incubação e da captura conjunta das emissões de CO2 e de NH3.
260 $aSeropédica: Embrapa Agrobiologia$c2014
300 $a32 p.
500 $a(Embrapa Agrobiologia. Boletim de Pesquisa e Desenvolvimento, 97).
520 $aAs emissões de CO2 e de NH3 são indicadores do nível de estabilidade de materiais orgânicos aos processos de decomposição. O objetivo deste trabalho foi avaliar a captura conjunta de CO2 e de NH3 em um único frasco de incubação. As emissões destes gases foram quantificadas das seguintes maneiras: 1- Captura conjunta de CO2 e de NH3; 2- Captura isolada de CO2; 3- Captura isolada de NH3. T. A emissão de NH3 obtidos nas incubações com captura conjunta diferiram dos resultados obtidos nas incubações com captura isolada. As análises de emissão de NH3 com captura isolada, sem a presença de NaOH no frasco de incubação, podem apresentar resultados subestimados, provavelmente devido ao efeito de acidificação da amostra promovido pelo acúmulo de CO2 no frasco de incubação. A presença de NaOH nas incubações reduz ou evita o acúmulo de CO2 e a consequente redução do pH das amostra, o que torna os resultados de emissão de NH3 mais próximos aos que seriam encontrados em ambiente aberto.
650 $aComposto Orgânico
650 $aDecomposição
653 $aRespirometria
653 $aVolatização de amônia
700 1 $aLEAL, M. A. de A.
700 1 $aROCHA, M. dos S.
700 1 $aGUERRA, J. G. M.
700 1 $aRIBEIRO, R. de L. D.
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