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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
28/09/2011 |
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Data da última atualização: |
22/11/2011 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BARBOSA, R. A.; NASCIMENTO JÚNIOR, D. do; VILELA, H. H; SILVA, S. C. da; EUCLIDES, V. P. B.; SBRISSIA, A. F.; SOUSA, B. M. de L. |
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Afiliação: |
RODRIGO AMORIM BARBOSA, CNPGC; Domicio do Nascimento Júnior, Universidade Federal de Viçosa, Departamento de Zootecnia, Viçosa/MG.; Hélio Henrique Vilela, Universidade Federal de Viçosa, Departamento de Zootecnia, Viçosa/MG.; Sila Carneiro da Silva, Universidade de São Paulo, Escola Superior de Agricultura “Luiz de Queiroz”, Departamento de Zootecnia, Piracicaba/SP.; VALERIA PACHECO BATISTA EUCLIDES, CNPGC; André Fischer Sbrissia, Universidade do Estado de Santa Catarina, Departamento de Produção Animal e Alimentos, Lages/SC; Braulio Maia de Lana Sousa, Universidade Federal de Viçosa, Departamento de Zootecnia, Viçosa/MG. |
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Título: |
Morphogenetic and structural characteristics of guinea grass pastures submitted to three frequencies and two defoliation severities. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Revista Brasileira de Zootecnia,v.40, n.5, p.947-954, 2011. |
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Idioma: |
Inglês |
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Conteúdo: |
It was evaluated the morphogenic and structural characteristics of guinea grass under rotational at three grazing intervals and two defoliation intensities. Grazing intervals corresponded to the time needed by the forage canopy to reach 90, 95 or 100% of incident light interception during regrowth and they were evaluated combined to two defoliation severities (post-grazing conditions, 25 and 50 cm of height), being allocated to experimental units according to a complete randomized design, with three replicates and 3 × 2 factorial arrangement. The experiment was conducted from July 2003 to May 2004. For evaluation of morphogenetic and structural characteristics, ten tillers per experimental unit were selected. Morphogenetic and structural characteristics were strongly influenced by seasons of the year inasmuch as leaf elongation rate increased 3.5 fold from winter to summer. In addition to year season effect, there was also an effect of defoliation frequencies on tiller population density, which was greater in the defoliation period corresponding to 90% of light interception, especially if evaluated in relation to the interval corresponding to 100% of light interception. Defoliation frequency is determinant in expression of phenotypic plasticit, acting on the control of stem elongation. |
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Palavras-Chave: |
Manejo do pastejo. |
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Thesagro: |
Panicum Maximum; Pastagem. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/42584/1/valeria2.pdf
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Marc: |
LEADER 02042naa a2200229 a 4500
001 1901685
005 2011-11-22
008 2011 bl uuuu u00u1 u #d
100 1 $aBARBOSA, R. A.
245 $aMorphogenetic and structural characteristics of guinea grass pastures submitted to three frequencies and two defoliation severities.$h[electronic resource]
260 $c2011
520 $aIt was evaluated the morphogenic and structural characteristics of guinea grass under rotational at three grazing intervals and two defoliation intensities. Grazing intervals corresponded to the time needed by the forage canopy to reach 90, 95 or 100% of incident light interception during regrowth and they were evaluated combined to two defoliation severities (post-grazing conditions, 25 and 50 cm of height), being allocated to experimental units according to a complete randomized design, with three replicates and 3 × 2 factorial arrangement. The experiment was conducted from July 2003 to May 2004. For evaluation of morphogenetic and structural characteristics, ten tillers per experimental unit were selected. Morphogenetic and structural characteristics were strongly influenced by seasons of the year inasmuch as leaf elongation rate increased 3.5 fold from winter to summer. In addition to year season effect, there was also an effect of defoliation frequencies on tiller population density, which was greater in the defoliation period corresponding to 90% of light interception, especially if evaluated in relation to the interval corresponding to 100% of light interception. Defoliation frequency is determinant in expression of phenotypic plasticit, acting on the control of stem elongation.
650 $aPanicum Maximum
650 $aPastagem
653 $aManejo do pastejo
700 1 $aNASCIMENTO JÚNIOR, D. do
700 1 $aVILELA, H. H
700 1 $aSILVA, S. C. da
700 1 $aEUCLIDES, V. P. B.
700 1 $aSBRISSIA, A. F.
700 1 $aSOUSA, B. M. de L.
773 $tRevista Brasileira de Zootecnia,v.40$gn.5, p.947-954, 2011.
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Registro original: |
Embrapa Gado de Corte (CNPGC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Amapá; Embrapa Amazônia Ocidental; Embrapa Amazônia Oriental; Embrapa Pecuária Sul. |
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Data corrente: |
06/02/2023 |
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Data da última atualização: |
07/03/2023 |
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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: |
SMITH, M. N.; STARK, S. C.; TAYLOR, T. C.; SCHIETTI, J.; ALMEIDA, D. R. A. de; ARAGÓN, S.; TORRALVO, K.; LIMA, A. P.; OLIVEIRA, G. de; ASSIS, R. L. de; LEITOLD, V.; PONTES-LOPES, A.; SCOLES, R.; VIEIRA, L. C. de S.; RESENDE, A. F.; COPPOLA, A. I.; BRANDÃO, D. O.; SILVA JUNIOR, J. de A.; LOBATO, L. F.; FREITAS, W.; ALMEIDA, D.; SOUZA, M. S.; MINOR, D. M.; VILLEGAS, J. C.; LAW, D. J.; GONÇALVES, N.; ROCHA, D. G. da; GUEDES, M. C.; TONINI, H.; SILVA, K. E. da; HAREN, J. van; ROSA, D. M.; VALLE, D. F. do; CORDEIRO, C. L.; LIMA, N. Z. de; SHAO, G.; MENOR, I. O.; CONTI, G.; FLORENTINO, A. P.; MONTTI, L.; ARAGÃO, L. E. O. C.; McMAHON, S. M.; PARKER, G. G.; BRESHEARS, D. D.; COSTA, A. C. L. da; MAGNUSSON, W. E.; MESQUITA, R.; CAMARGO, J. L. C.; OLIVEIRA JUNIOR, R. C. de; CAMARGO, P. B. de; SALESKA, S. R.; NELSON, B. W. |
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Afiliação: |
MARIELLE N. SMITH, MICHIGAN STATE UNIVERSITY; SCOTT C. STARK, MICHIGAN STATE UNIVERSITY; TYEEN C. TAYLOR, UNIVERSITY OF MICHIGAN; JULIANA SCHIETTI, UNIVERSIDADE FEDERAL DO AMAZONAS; DANILO ROBERTI ALVES DE ALMEIDA, UNIVERSIDADE DE SÃO PAULO; SUSAN ARAGÓN, UNIVERSIDADE FEDERAL DO OESTE DO PARÁ; KELLY TORRALVO, INSTITUTO NACIONAL DE PESQUISAS DA AMAZÔNIA; ALBERTINA P. LIMA, INSTITUTO NACIONAL DE PESQUISAS DA AMAZÔNIA; GABRIEL DE OLIVEIRA, UNIVERSITY OF SOUTH ALABAMA; RAFAEL LEANDRO DE ASSIS, INSTITUTO NACIONAL DE PESQUISAS DA AMAZÔNIA; VERONIKA LEITOLD, UNIVERSITY OF MARYLAND; ALINE PONTES-LOPES, INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS; RICARDO SCOLES, UNIVERSIDADE FEDERAL DO OESTE DO PARÁ; LUCIANA CRISTINA DE SOUSA VIEIRA, INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS; ANGELICA FARIA RESENDE, UNIVERSIDADE DE SÃO PAULO; ALYSHA I. COPPOLA, GEOLOGICAL INSTITUTE BIOGEOSCIENCES; DIEGO OLIVEIRA BRANDÃO, INSTITUTO NACIONAL DE PESQUISAS DA AMAZÔNIA; JOÃO DE ATHAYDES SILVA JUNIOR, UNIVERSIDADE FEDERAL DO PARÁ; LAURA F. LOBATO, UNIVERSIDADE FEDERAL DO OESTE DO PARÁ; WAGNER FREITAS, UNIVERSIDADE FEDERAL DO OESTE DO PARÁ; DANIEL ALMEIDA, UNIVERSIDADE FEDERAL DO OESTE DO PARÁ; MENDELL S. SOUZA, UNIVERSIDADE FEDERAL DO OESTE DO PARÁ; DAVID M. MINOR, UNIVERSITY OF MARYLAND; JUAN CAMILO VILLEGAS, UNIVERSIDAD DE ANTIOQUIA; DARIN J. LAW, UNIVERSITY OF ARIZONA; NATHAN GONÇALVES, MICHIGAN STATE UNIVERSITY; DANIEL GOMES DA ROCHA, UNIVERSITY OF CALIFORNIA–DAVIS; MARCELINO CARNEIRO GUEDES, CPAF-AP; HELIO TONINI, CPPSUL; KATIA EMIDIO DA SILVA, CPAA; JOOST VAN HAREN, UNIVERSITY OF ARIZONA; DIOGO MARTINS ROSA, INSTITUTO NACIONAL DE PESQUISAS DA AMAZÔNIA; DALTON FREITAS DO VALLE, INSTITUTO NACIONAL DE PESQUISAS DA AMAZÔNIA; CARLOS LEANDRO CORDEIRO, INSTITUTO INTERNACIONAL PARA SUSTENTABILIDADE; NICOLAS ZASLAVSKY DE LIMA, UNIVERSIDADE FEDERAL DO OESTE DO PARÁ; GANG SHAO, MICHIGAN STATE UNIVERSITY; IMMA OLIVERAS MENOR, UNIVERSITY OF OXFORD; GEORGINA CONTI, UNIVERSIDAD NACIONAL DE CÓRDOBA; ANA PAULA FLORENTINO, INSTITUTO NACIONAL DE PESQUISAS DA AMAZÔNIA; LÍA MONTTI, UNIVERSIDAD NACIONAL DE MAR DEL PLATA-CONICET; LUIZ E. O. C. ARAGÃO, INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS; SEAN M. MCMAHON, SMITHSONIAN ENVIRONMENTAL RESEARCH CENTER; GEOFFREY G. PARKER, SMITHSONIAN ENVIRONMENTAL RESEARCH CENTER; DAVID D. BRESHEARS, UNIVERSITY OF ARIZONA; ANTONIO CARLOS LOLA DA COSTA, UNIVERSIDADE FEDERAL DO PARÁ; WILLIAM E. MAGNUSSON, INSTITUTO NACIONAL DE PESQUISAS DA AMAZÔNIA; RITA MESQUITA, INSTITUTO NACIONAL DE PESQUISAS DA AMAZÔNIA; JOSÉ LUÍS C. CAMARGO, INSTITUTO NACIONAL DE PESQUISAS DA AMAZÔNIA; RAIMUNDO COSME DE OLIVEIRA JUNIOR, CPATU; PLINIO B. DE CAMARGO, UNIVERSIDADE DE SÃO PAULO; SCOTT R. SALESKA, UNIVERSITY OF ARIZONA; BRUCE WALKER NELSON, INSTITUTO NACIONAL DE PESQUISAS DA AMAZÔNIA. |
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Título: |
Diverse anthropogenic disturbances shift Amazon forests along a structural spectrum. |
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Ano de publicação: |
2023 |
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Fonte/Imprenta: |
Frontiers in Ecology an the Environment, v. 21, n. 1, p. 24-32, 2023. |
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DOI: |
https://doi.org/10.1002/fee.2590 |
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Idioma: |
Inglês |
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Conteúdo: |
Amazon forests are being degraded by myriad anthropogenic disturbances, altering ecosystem and climate function. We analyzed the effects of a range of land-use and climate-change disturbances on fine-scale canopy structure using a large database of profiling canopy lidar collected from disturbed and mature Amazon forest plots. At most of the disturbed sites, surveys were conducted 10?30 years after disturbance, with many exhibiting signs of recovery. Structural impacts differed in magnitude more than in character among disturbance types, producing a gradient of impacts. Structural changes were highly coordinated in a manner consistent across disturbance types, indicating commonalities in regeneration pathways. At the most severely affected site ? burned igapó (seasonally flooded forest) ? no signs of canopy regeneration were observed, indicating a sustained alteration of microclimates and consequently greater vulnerability to transitioning to a more open-canopy, savanna-like state. Notably, disturbances rarely shifted forests beyond the natural background of structural variation within mature plots, highlighting the similarities between anthropogenic and natural disturbance regimes, and indicating a degree of resilience among Amazon forests. Studying diverse disturbance types within an integrated analytical framework builds capacity to predict the risk of degradation-driven forest transitions. |
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Thesagro: |
Floresta; Floresta Tropical; Mudança Climática; Regeneração. |
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Categoria do assunto: |
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K Ciência Florestal e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1152143/1/CPAFAP-Diverse-anthropogenic-disturbances.pdf
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Marc: |
LEADER 03574naa a2200793 a 4500
001 2152143
005 2023-03-07
008 2023 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1002/fee.2590$2DOI
100 1 $aSMITH, M. N.
245 $aDiverse anthropogenic disturbances shift Amazon forests along a structural spectrum.$h[electronic resource]
260 $c2023
520 $aAmazon forests are being degraded by myriad anthropogenic disturbances, altering ecosystem and climate function. We analyzed the effects of a range of land-use and climate-change disturbances on fine-scale canopy structure using a large database of profiling canopy lidar collected from disturbed and mature Amazon forest plots. At most of the disturbed sites, surveys were conducted 10?30 years after disturbance, with many exhibiting signs of recovery. Structural impacts differed in magnitude more than in character among disturbance types, producing a gradient of impacts. Structural changes were highly coordinated in a manner consistent across disturbance types, indicating commonalities in regeneration pathways. At the most severely affected site ? burned igapó (seasonally flooded forest) ? no signs of canopy regeneration were observed, indicating a sustained alteration of microclimates and consequently greater vulnerability to transitioning to a more open-canopy, savanna-like state. Notably, disturbances rarely shifted forests beyond the natural background of structural variation within mature plots, highlighting the similarities between anthropogenic and natural disturbance regimes, and indicating a degree of resilience among Amazon forests. Studying diverse disturbance types within an integrated analytical framework builds capacity to predict the risk of degradation-driven forest transitions.
650 $aFloresta
650 $aFloresta Tropical
650 $aMudança Climática
650 $aRegeneração
700 1 $aSTARK, S. C.
700 1 $aTAYLOR, T. C.
700 1 $aSCHIETTI, J.
700 1 $aALMEIDA, D. R. A. de
700 1 $aARAGÓN, S.
700 1 $aTORRALVO, K.
700 1 $aLIMA, A. P.
700 1 $aOLIVEIRA, G. de
700 1 $aASSIS, R. L. de
700 1 $aLEITOLD, V.
700 1 $aPONTES-LOPES, A.
700 1 $aSCOLES, R.
700 1 $aVIEIRA, L. C. de S.
700 1 $aRESENDE, A. F.
700 1 $aCOPPOLA, A. I.
700 1 $aBRANDÃO, D. O.
700 1 $aSILVA JUNIOR, J. de A.
700 1 $aLOBATO, L. F.
700 1 $aFREITAS, W.
700 1 $aALMEIDA, D.
700 1 $aSOUZA, M. S.
700 1 $aMINOR, D. M.
700 1 $aVILLEGAS, J. C.
700 1 $aLAW, D. J.
700 1 $aGONÇALVES, N.
700 1 $aROCHA, D. G. da
700 1 $aGUEDES, M. C.
700 1 $aTONINI, H.
700 1 $aSILVA, K. E. da
700 1 $aHAREN, J. van
700 1 $aROSA, D. M.
700 1 $aVALLE, D. F. do
700 1 $aCORDEIRO, C. L.
700 1 $aLIMA, N. Z. de
700 1 $aSHAO, G.
700 1 $aMENOR, I. O.
700 1 $aCONTI, G.
700 1 $aFLORENTINO, A. P.
700 1 $aMONTTI, L.
700 1 $aARAGÃO, L. E. O. C.
700 1 $aMcMAHON, S. M.
700 1 $aPARKER, G. G.
700 1 $aBRESHEARS, D. D.
700 1 $aCOSTA, A. C. L. da
700 1 $aMAGNUSSON, W. E.
700 1 $aMESQUITA, R.
700 1 $aCAMARGO, J. L. C.
700 1 $aOLIVEIRA JUNIOR, R. C. de
700 1 $aCAMARGO, P. B. de
700 1 $aSALESKA, S. R.
700 1 $aNELSON, B. W.
773 $tFrontiers in Ecology an the Environment$gv. 21, n. 1, p. 24-32, 2023.
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Registro original: |
Embrapa Amapá (CPAF-AP) |
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