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| Registros recuperados: 587 | |
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| Albarello de Cezaro, Jussan; Trevisan, Rômulo; Balbinot, Rafaelo. |
| Esse estudo objetivou avaliar as propriedades físico-mecânicas da madeira de Chrysophyllum marginatum (Hook. e Arn.) Radlk. Foram utilizadas três árvores com 20,3 ± 6 cm de diâmetro. Por regressão, determinou-se a variação no sentido base-topo de retratibilidade, coeficiente anisotrópico, teor de umidade saturado e massa específica básica. Para caracterizar a flexão estática na primeira tora, nas condições úmida e seca ao ar, foi realizada análise de variância pelo teste de Tukey. Observou-se decréscimo das contrações radial e tangencial e da massa específica básica da madeira no sentido base-topo, inversamente ao teor de umidade saturado, que apresentou uma variação crescente. Na análise do coeficiente anisotrópico, verificou-se uma tendência de acréscimo... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Shrinkage; Anisotropic coefficient; Static bending Propriedades físico-mecânicas da madeira Tecnologia da madeira Retratibilidade; Coeficiente anisotrópico; Flexão estática. |
| Ano: 2016 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/884 |
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| Althaus, Michelle Melissa; Leal, Luciana Christina; Silveira, Fernanda Christina; Zuffellato-Ribas, Katia Christina; Ribas, Luciana Lopes Fortes. |
| Berberis laurina Billb. (Berberidaceae) is a native shrub from Floresta Ombrófila Mista ecological formation, very ornamental and useful specie for recovery of degraded areas. With medical applications, its fruit is edible and its roots are used as dye. This paper aims to analyze lhe induction of lhe rooting of Berberis laurina stem cuttings employing indolebutyric acid (IBA) in O, 1000 and 2000 mgL-1 concentrations, using the vermiculite as growing medium. In october 2003, stem cuttings were collected from eight stock plants, located in Fazenda Rio Grande - PR. Semi-hardwood cuttings were preppared with 8.0 cm long by 0.35 cm of diameter shape, containing three leaves on the top, cut in a half, the base was cut in diagonal and the top was cut straight,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rooting; Auxin; Ornamental species; Species for recovery of degraded areas Enraizamento; Auxina; Espécie ornamental; Recuperação de áreas degradadas. |
| Ano: 2011 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/243 |
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| Alves, Allyson Rocha; Ferreira, Rinaldo Luiz Caraciolo; da Silva, José Antônio Aleixo; Dubeux Júnior, José Carlos Batista; Salami, Gabriela. |
| This study aimed to quantify nutrient content in shoot biomass components and litter in two areas of savanna vegetation with different ecological characteristics, one in regeneration and the other as a preserved area, in Floresta, Pernambuco State, Brazil. It was carried out an initial inventory launching 40 plots of 400 m2 in each area, with inclusion level of circumference at 1.3 m above ground level ≥ 6.0 cm. The five species with highest importance value were used for biomass analysis. Chemical analysis were carried out in samples of 100 g taken from the different component of each of those species. To estimate the stock of litter assortments were made in dry and rainy seasons, using a hollow square mold with 0.5 m randomly released in plots. It was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biogeochemical cycle; Regeneration; Dry forest Recursos Florestais; Engenharia Florestal Ciclo biogeoquímico; Regeneração; Floresta seca. |
| Ano: 2017 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1060 |
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| Andrade, Cinthia Grazielle Carvalho; da Silva, Márcio Lopes; Torres, Carlos Moreira Miquelino Eleto; Ruschel, Ademir Roberto; da Silva, Liniker Fernandes; de Andrade, Dárlison Fernandes Carvalho; Reis, Leonardo Pequeno. |
| Minquartia guianensis Aubl. (acariquara) occurs at Acre, Amazonas, Roraima, Pará and Amapá states, with a great market demand and utility in the Amazon region. It is used mainly in civil construction due to its high durability and singular beauty, because of reentrances in its trunk, resulting in high market value. Most of used trees present small diameters, what is a critical factor for their management and commercialization. Thus, the objective of this study was to evaluate M. guianensis diametric growth and cutting cycle through the analysis of time of passage among diameter classes, 31 years after logging, at Tapajós National Forest, Pará State, Brazil. Five treatments were established and in each one 12 permanent sample plots of 0.25 ha were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Productivity; Selective felling; Eastern Amazonia Recursos Florestais; Colheita Florestal; Manejo de Florestas Nativas Produtividade; Amazônia oriental; Corte de seleção. |
| Ano: 2017 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1406 |
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| Andrade, Guilherme de Castro; Bellote, Antonio Francisco Jurado; Ferreira, Carlos Alberto; Silva, Helton Damin da. |
| Acacia mearnsii is the third forest species more planted in Brazil, especially in small farms at Rio Grande do Sul State. The species is also known as black wattle and is important as a source of tannin, timber, pulpwood and rayon. Its fast growth results in high demand of nutrients and fertilization is necessary to keep site productivity. In this paper it is reported the results of the application of four doses of Phosphorous (0, 20, 40, 80g/tree as P2O5) and three of Potassium (0, 20, 40g/tree as K2O), in a factorial designed trial established on a chemically poor soil at the region of Ponta Grossa, State of Paraná, Brazil. Trees were implanted in a 3m X 2m spacing with 35 plants per plot. The fertilizers were applied in furrows between the rows at the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Reforestation; Fertilization; Nutrients; Phosphorous; Potassium; Wood productivity Reflorestamento; Fertilização; Nutrientes; Fósforo; Potássio; Produtividade de madeira. |
| Ano: 2004 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1596 |
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| Andrade, Guilherme de Castro; Bellote, Antonio Francisco Jurado; Silva, Helton Damin da; Rizzi, Nivaldo Eduardo; Gava, José Luiz. |
| Large quantities of organic wastes are produced mainly in big cities, annually. There is urgent demand for safe and possible economic practices for its use on forest plantations. This study evaluated the effects of the application of urban waste and mineral fertilizers on Eucalyptus grandis W. Hill ex Maiden plantation growing on Neossolo Quartzarênico, analyzing nutrient contents in the litter and in the above ground biomass of trees at 86 months old. The results showed that those plots that received organic wastes presented biomass increments of 36.9 % and largest contents of N, P, K and Ca, 86 months after the establishment. After harvesting, largest nutrient pools remained on those same plots (18 % to 49 %), contributing significantly to maintain... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Reforestation; Organic wastes; Mineral nutrition. Plantios florestais; Resíduos orgânicos; Adubação; Nutrição mineral.. |
| Ano: 2011 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/207 |
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| Andrade, Guilherme de Castro; Bognola, Itamar Antonio; Bellote, Antonio Francisco Jurado; Franciscon, Luziane; Waterloo, Maarten Johannes; Bruijnzeel, Leendert Adriaan. |
| No Brasil os plantios florestais ocupam 7 milhões de hectares que correspondem a 1% do território (68% com plantações de Eucalyptus e 25% com Pinus) O objetivo desse trabalho foi avaliar plantios de Eucalyptus urograndis. Estoques elevados de Ca e Mg no solo, sugerem uma lixiviação do calcário. A resistência do solo até os 60 cm de profundidade na linha de plantio foi menor do que na entrelinha, indicando que a subsolagem foi eficiente. Os valores de resistência do solo foram mais altos na entrelinha, distante 1 m da linha de plantio, até os 20 cm de profundidade, provavelmente pelo aumento da compactação na preparação da área. A biomassa da copa das árvores diferiu entre as classes de DAP, justificando o uso de equação para a sua estimativa. A variação... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forest plantation; Biomass; Litter; Soil fertility; Soil strength Plantação florestal; Biomassa; Serapilheira Fertilidade do solo; Resistência do solo. |
| Ano: 2011 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/273 |
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| Andrade, Guilherme de Castro; Silva, Helton Damin da; Bellote, Antonio Francisco Jurado; Ferreira, Carlos Alberto. |
| No Brasil, os plantios de árvores de rápido crescimento, principalmente espécies de Eucalyptus e de Pinus, representam uma oferta de milhares de empregos e significativa contribuição ao PIB. Do ponto de vista ambiental, contribuem para reduzir a pressão sobre as florestas nativas, concorrendo assim para a sua preservação e a dos recursos naturais nelas existentes. Esses povoamentos florestais, implantados na sua maioria em solos de baixa fertilidade, apresentam altas taxas de crescimento, necessitando de quantidades significativas de água e nutrientes do solo, o que causa preocupações com a sustentabilidade desses sistemas e com a necessidade de reposição futura de nutrientes. A utilização de resíduos para esta finalidade é considerada prioritária. Neste... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Reflorestamento; Fertilização; Nutrientes; Fósforo; Produtividade de madeira Reforestation; Fertilization; Wastes; Nutrients; Phosphorous; Wood productivity. |
| Ano: 2003 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1607 |
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| Andrade, Valdir Carlos Lima de; Kroetz, Elaine Aparecida; Nicola, Andrei; Souza, Priscila Bezerra de; Nohama, Fabiano Kenji; Leite, Helio Garcia; Binoti, Daniel Henrique Breda; BinotiI, Mayra Luiza Marques da Silva. |
| This study aimed at evaluating the application of linear hypsometric equations in savanna located in the state of Tocantins, Brazil. Data were obtained in 46 plots of 1,000 m² each, and 13 plots were used to simulate six different systems of data sampling to fit hypsometric models. The remaining 33 plots were reserved for an application test of generated hypsometric equations. In this assessment, to decide the sampling system and model, in addition to the residual graphic analysis, the following statistic criteria were adopted: residual standard error and multiple linear correlation. After this decision, a model identity test was applied to determine the best way to prepare the database aiming at the hypsometric models adjustment. We concluded that the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Savanna tocantinense; Hypsometric models; Models identity Recursos Florestais; Engenharia Florestal; Biometria Florestal Cerrado tocantinense; Modelos hipsométricos; Identidade de modelos. |
| Ano: 2015 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/683 |
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| Arantes, Flávio Cese; Scaloppi Junior, Erivaldo José; Gonçalves, Paulo Souza; Moraes, Mario Luiz Teixeira de; Gonçalves, Elaine Cristine Piffer; Resende, Marcos Deon Vilela de. |
| The aim of this work was to select progenies with high adaptability and stability from the dry rubber yield (PBS), of genotypes from a three-year-old rubber tree population, installed in three different locations (Selvíria, MS, Votuporanga, SP and Colina, SP), by the MHPRVG (harmonic average performance relative breeding values) method predicted by BLUP. The progenies were installed in a randomized block design with 30 treatments (progenies), three replications and 10 plants per plot, with spacingof 3.00 x 3.00 m (Selvíria, MS) and 1.50 x 1.50 m (Colina, SP and Votuporanga, SP). The PBS presented considerable genetic coefficient variability, ranging from 23.03 to 27.82% and average heritability ranging from 0.47 to 0.99, indicating the high value of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Melhoramento Genético Florestal Hevea brasiliensis HMMm genetic selection Hevea brasiliensis; REML/BLUP; Seleção genética; HMMm. |
| Ano: 2013 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/436 |
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| Registros recuperados: 587 | |
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