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| Registros recuperados: 587 | |
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| Souza, Frederico de; Vale, Ailton Teixeira do. |
| A densidade energética é uma das principais propriedades que definem a qualidade do briquete, pois resume as características químicas, as condições de umidade e a quantidade de calor do produto final em uma única variável. Para analisá-la, foram confeccionados seis briquetes por tratamento (pinus, tauari, cumaru, casca de arroz, bagaço de cana e torta de pinhão manso) em uma prensa briquetadeira Lippel modelo LB-32 com 40 g de biomassa cada e 5 min de prensagem. Os parâmetros de briquetagem foram: duas temperaturas (130 e 200 ºC), duas pressões de compactação (80 e 120 kgf cm-²) e dois tamanhos de partículas (grossas – retidas em peneira 35 mesh; finas – não retidas a 35 mesh). A densidade energética foi obtida multiplicando-se o poder calorífico útil pela... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Recursos Florestais; Engenharia Florestal; Energia da Biomassa Vegetal; Briquetagem Bioenergia; Compactação de biomassa; Resíduos agroflorestais Bioenergy; Biomass compression Agroforestry waste. |
| Ano: 2016 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/879 |
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| Favalessa, Cyro Matheus Cometti; Ubialli, Jaime Antônio; Caldeira, Sidney Fernando; Drescher, Ronaldo. |
| The aim of this study was to compare the accuracy of the non-segmented polynomial models of Fifth degree and Hradetzky from 1976 and the segmented models of Max and Burkhart from 1976 and Clark et al. from 1991, in estimating diameters along the stem of Tectona grandis L.f., with adjustments for the full set of data and by diameter class in a 16 years old stand in the center–southern region of Mato Grosso State, Brazil. The database consisted of 114 trees, scaled by the modified Hohenadl method and distributed in diameter classes. The models adjustments were evaluated according to the adjusted coefficient of determination, standard eError of estimate and distribution of residuals. The accuracy of the models along the stem was evaluated by deviation,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Teak; Bole form; Rigorous tree scaling; Diameter classes; Models Tectona grandis; Forma do fuste; Cubagem rigorosa; Classes de diâmetro; Modelos polinomiais. |
| Ano: 2012 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/320 |
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| Canal, Wagner Davel; Carvalho, Ana Márcia Macedo Ladeira; Oliveira, Aylson Costa; de Magalhães, Mateus Alves; Cândido, Welliton Lelis; Fialho, Lucas de Freitas. |
| O presente estudo foi realizado com o objetivo de avaliar a degradação térmica da madeira e a liberação de gases condensáveis e não condensáveis em sua carbonização. Utilizou-se madeira de Eucalyptus spp. com aproximadamente 7 anos de idade, proveniente de um teste clonal de uma empresa florestal, localizado em Divinésia, MG. Foram realizadas a análise termogravimétrica da madeira (TG/DTG) e carbonizações em mufla a fim de determinar o comportamento térmico da madeira e o fator de emissão dos gases não condensáveis e condensáveis (CO, CO2, CH4, H2, e licor pirolenhoso). Instalou-se o experimento a fim de se descrever as médias das emissões de gases não condensáveis e condensáveis. A degradação térmica da madeira seguiu comportamento inverso às emissões de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tecnologia e utilização de produtos florestais; Energia da madeira degradação térmica da madeira liberação de gases efeito estufa carvão vegetal Thermal degradation; Charcoal; Eucalyptus. |
| Ano: 2016 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1083 |
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| Favalessa, Cyro Matheus Cometti; Ubialli, Jaime Antônio; Caldeira, Sidney Fernando; Drescher, Ronaldo; Acosta, Fidel Cándano. |
| O objetivo desse estudo foi comparar a acurácia das estimativas dos volumes ao longo do fuste de Tectona grandis L.f propiciadas por ajustes de modelos polinomiais segmentados e não segmentados, para um povoamento na região Centro-Sul de Mato Grosso. Foram cubadas 114 árvores de Tectona grandis, pela metodologia de Hohenadl com 16 seções. Os modelos não segmentados testados foram o do quinto grau proposto por Schöepfer em 1966 e o de Haradetzky de 1976 e os modelos segmentados, foram o de Max e Burkhart de 1976 e de Clark et al. de 1991. A acuracia dos modelos foi avaliada pelo desvio, desvio padrão das diferenças, somatório de quadrado dos resíduos relativos e a porcentagem dos resíduos. A equação do quinto grau é a mais acurada na estimativa dos volumes... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Teca; Classe diamétrica; Hohenadl; Afilamento Teak; Diameter class; Hohenadl; Taper. |
| Ano: 2012 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/325 |
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| Freire, Juliana Müller; de Azevedo, Marina Coimbra; Cunha, Carlos Fernando da; da Silva, Telmo Félix; Resende, Alexander Silva de. |
| Phenological studies can support actions of seed collection and recovery of degraded areas, contributing to the conservation of forest species. This study aimed to understand the timing of flowering and fruiting of 21 native tree species in fragmented area of Atlantic Forest in Itaboraí, Rio de Janeiro State, Brazil. Ninety one trees were monitored monthly, from January to December of 2011. Most species flowered in the late dry season and early rainy season, and presented a moderate negative correlation between flowering and photoperiod. There were two peaks of fruiting: March-April to zoochoric species and September-October for not zoochoric species, with positive correlation between rainfall and fruiting of zoochoric species. There was a high incidence... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Flowering; Fruiting; Phenology; Seeds Recursos Florestais Botânica Silvicultura Fenologia; Floração; Frutificação; Sementes. |
| Ano: 2013 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/454 |
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| Santos, Rosimeire Cavalcante dos; Carneiro, Angélica de Cássia Oliveira; Castro, Renato Vinícius Oliveira; Pimenta, Alexandre Santos; Castro, Ana Flávia Neves Mendes; Marinho, Itaragil Venâncio; Boas, Mariana Almeida Villas. |
| This study aimed to evaluate the potential use of waste generated by forestry species that occur in semiarid northeastern at Seridó region, Rio Grande do Norte, for the briquettes production, determine the physical and mechanical briquettes properties, and to correlate the wood density with the density after the briquettes production and briquettes density with the compressive strength. Thirty-two trees were collected (eight species with four replications). The wood physical and chemical properties evaluation were held under a completely randomized design. For the variables related to briquette, it was adopted the same design with three replicates for each species, totalizing 24 sampling units. The briquettes produced with jurema-preta wood stood out as a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forest residues; Briquetting; Renewable energy; Semi-arid Brazilian region Resíduos florestais; Briquetagem; Energia renovável; Região semiárida brasileira. |
| Ano: 2011 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/292 |
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| Maeda, Shizuo; Silva, Helton Damin da; Bellote, Antonio Francisco Jurado. |
| The application of cellulosic waste in forest plantations is an alternative to disposal, but more studies are necessary to confirm the safity of this disposal. The response of Pinus taeda L. to salinity in Humic Distrocryept was evaluated. In plantation, the seedlings were assessed for their height and stem diameter (SD), and at 120 days, were assessed the SD, height, dried root biomass (DRB), shoot (DBS) and total dried matter (TDM). The contents of P, K, Ca, Mg and Na were determinated, and, based on these levels it was estimated the quantity of these elements and calculated the efficiency use in leaves and roots and translocation to the shoot. Except the relationship between DSB/DRB, the other variables were significantly influenced by increased... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Electric conductivity; Plant growth; Nutritional efficiency. Condutividade elétrica; Crescimento vegetal; Eficiência de utilização.. |
| Ano: 2010 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/110 |
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| Brienza Júnior, Silvio; Oliveira, Raimundo Parente de; Denich, Manfred; Vlek, Paul L.G.. |
| The objective of the present paper was to evaluate the survival of planted leguminous trees to restore degraded areas and yields of maize and cassava in traditional farming system. The trees species Acacia angustissima, Clitoria racemosa, Inga edulis, and Acacia mangium were planted at spacing of 1 m x 1 m, 2 m x 1 m and 2 m x 2 m. Sclerolobium paniculatum was planted only at spacing of 2 m x 1 m. The maize, remained in the cropping system during the first four months, and it was considered as monocropping phase and, yielded 1,890 +/- 32 kg ha-1. The survival of planted trees was not negatively impacted by the presence of agricultural crops. Regardless of the spacing, the planted trees did not cause a negative impact on dry weight of cassava root. There... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fallow enrichment; Density of planting; Degraded land; Leguminous tree Enriquecimento de capoeira; Espaçamento de plantio; Área degradada; Árvores leguminosas. |
| Ano: 2011 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/317 |
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| Morais, Weslley Wilker Corrêa; Susin, Felipe; Vivian, Magnos Alan; Araújo, Maristela Machado. |
| Aiming to evaluate the development of seedlings of Schinus terebinthifolius under different irrigation depth, an experiment was installed in a greenhouse. The experimental design used was randomized block consisting of 4 treatments with 3 blocks. The irrigation depths evaluated were 8, 10, 12 and 14 mm daily, respectively T1, T2, T3 and T4. Seedling production was performed in tubes with 280 cm ³ filled with pine bark basis substrate and fertilizer. The development of the seedlings, were evaluated by the following characteristics: height of aerial part (APA), diameter at breast height (D),dried mass weight of roots (PMSR), dried mass weight of aerial part (PMSPA), total dried mass (MST) and relation (h/d). The treatment T3 presented the best results in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aroeira vermelha; Water depth; Morphologic features Aroeira vermelha; Lâmina d’água; Características morfológicas. |
| Ano: 2012 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/313 |
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| Gonçalves, Fabricio Gomes; Carvalho, Acácio Geraldo de; Cardoso, Willian Vagner Matos; Rodrigues, Cleyton dos Santos. |
| Objetivou-se neste trabalho fazer um levantamento de broqueadores de madeira das famílias Cerambicydae, Lyctidae, Bostrichidae, Buprestidae e subfamílias Platypodinae e Scolytinae, em ambiente natural na Mata Atlântica e em plantio de eucalipto. Instalou-se entre os meses de abril e outubro, 20 armadilhas modelo Carvalho 47 adaptado, distantes 50 m umas da outras. Estas foram instaladas a 1,3 m do solo e iscadas com etanol (92,8º), sendo cinco por ambiente: fragmento de Mata Atlântica (borda e interior); plantio de eucalipto (borda e interior). Coletou-se um total de 1.797 indivíduos, em coletas semanais matutinas. O talhão de eucalipto apresentou maior número de indivíduos em ambos ambientes analisados (992 indivíduos). A subfamília Scolytinae foi a mais... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Madeira; Resistência natural; Armadilha etanólica Wood; Natural resistence; Ethanol trap. |
| Ano: 2014 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/499 |
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| Guimarães Junior, José Benedito; Araújo, Bruna Layara Messias; Lopes, Olívia Pereira; Mendes, Rafael Farinassi; Mendes, Lourival Marin. |
| Esse trabalho teve como objetivo a avaliar a qualidade de painéis aglomerados de madeira de desrama de Acacia mangium Willd, de forma comparativa com painéis de Pinus oocarpa e Eucalyptus grandis. A madeira de A. mangium foi obtida no Sul do estado do Piauí e as amostras de madeira de P. oocarpa e E. grandis foram coletadas em plantios na cidade de Lavras, MG. Para a produção dos painéis foi utilizado 8% de adesivo uréia-formaldeído e 1% de parafina. Os painéis foram prensados a 160 ºC, pressão de 3,92 MPa por 8 minutos. Considerando as propriedades físicas, os painéis de madeira de desrama de A. mangium e P. oocarpa apresentaram os melhores resultados, com destaque para a desrama de A. mangium ., uma vez que apresentou valores de inchamento em espessura... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Recursos Florestais; Engenharia Florestal; Tecnologia da Madeira Aglomerados convencionais; Desrama; Acacia mangium Willd. |
| Ano: 2013 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/434 |
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| Venzke, Tiago Schuch Lemos; Herter, Gabriel Kaster; Mattei, Vilmar Luciano. |
| Foi analisada a florística e a estrutura do componente arbóreo de uma mata de restinga paludosa na Praia do Totó, porção sul da Laguna dos Patos, Município de Pelotas, RS, Brasil (31º43’39”S e 52º12’04”W). A amostragem fitossociológica foi realizada em uma área de 0,1 ha. Foram incluídos todos os indivíduos com DAP ≥ 4,8 cm. Foi encontrada uma riqueza de 23 espécies, 20 gêneros e 15 famílias, sendo duas espécies ameaçadas de extinção. A densidade foi estimada em 3.480 ind. ha-1. As espécies mais importantes na estrutura da floresta foram Ocotea sp., Myrcia multiflora, Psidium cattleianum, Ocotea pulchella, Myrsine lorentziana, Citharexyllum myrianthum, Ilex dumosa, Syagrus romanzoffiana, Guapira opposita e Sebastiania brasiliensis. A diversidade (H’) foi... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ecologia Florestal Botânica Restauração Florestal Árvores; Ecologia Florestal; Floresta Turfosa; Planície Costeira; Praia do Laranjal Trees Forest ecology; Swamp Forest; Coastal Plain; Laranjal beach. |
| Ano: 2015 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/648 |
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| Queiroz, Dalva Luiz de; Tavares, Wagner de Souza; Araujo, Carolina Rodrigues de; Burckhardt, Daniel. |
| The eucalypt shoot psyllid, Blastopsylla occidentalis Taylor, 1985 (Hemiptera: Psylloidea), is reported here for the first time from Burundi, Indonesia (Sumatra), Nicaragua, the Philippines and Yemen. The record from Paraguay is shown to be erroneous. New state records are given for the Brazilian states Bahia, Ceará, Piauí and Rio Grande do Sul. Eucalyptus viminalis is listed for the first time as host of B. occidentalis. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forestry Resources New geographic records; Forest pest; Forest entomology Recursos Florestais Novos registros geográficos; Praga florestal; Entomologia florestal. |
| Ano: 2018 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1533 |
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| Braz, Evaldo Muñoz; Mattos, Patricia Povoa; Thaines, Fabio; de Madron, Luc Durrieu; Garrastazu, Marilice Cordeiro; Canetti, Aline; d’Oliveira, Marcus Vinício Neves. |
| Remnant forest structure and increment by diameter class play a decisive role in the recovery volume for the next cutting cycle. Tree species in the Amazon Forest do not present a defined pattern of diameter structure, which is discussed here using Cedrela odorata L. as a case study The aim of this study was to identify, by simulation, recovery from logging in a real situation at three timber production sites, and the alternatives that are available to ensure commercial timber volume to a second cut cycle in the Brazilian Amazon. The study is concerned regarding the diametric classes of productive trees to the next cycle, the comparison demonstrates that one of the strategies recovers stock volume more quickly than expected in the cut cycle defined by... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Manejo florestal; Dendrometria Cedrela odorata; Sustainable forest management; Cut rate; Rain Forest; Volume recover; Diametric structure Cedrela odorata; Manejo florestal sustentável Taxa de corte Floresta tropical; Recuperação em volume; Estrutura diamétrica. |
| Ano: 2015 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/941 |
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| Fowler, João Antonio Pereira; Sturion, José Alfredo; Zuffellato-Ribas, Katia Christina. |
| Ilex paraguariensis St.Hil., popularly named erva-mate in Brazil, is an indigenous species of the Araucaria Forest with a large geographic distribution and a high social and economic importance. The seeds of this species exhibits physiologic and seed coat impermeability dormancies and needs stratification on sand in order to break them. This work aimed to evaluate the influence of genotype -environment interaction on embryo development of erva-mate seeds formed under different environmental conditions. The fruits were collected in Cascavel, Toledo and Campo Mourão, State of Paraná, and in Soledade, State of Rio Grande do Sul, in February 2003. The experiment was carried out on Forest Seed Laboratory of Embrapa Florestas, in a completely randomized design... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ilex paraguariensis; Embryo; Germination; Dormancy. Embrião; Germinação; Dormência; Erva-mate.. |
| Ano: 2010 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/134 |
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| Nicoletti, Marcos Felipe; Batista, João Luis Ferreira; Carvalho, Samuel de Pádua Chaves; Castro, Tito Nunes de. |
| The objective of this study was to improve existing methods for determination of stem biomass in a non-destructive way, and verify the influence that laser dendrometers have on the prediction by existing empirical models in forest environment on the individual trees. This study was developed in Itatinga, SP, Brazil, in three plots of a Eucalyptus grandis plantation, totalizing 175 trees. The stem diameter of standing trees were measured with two dendrometers, Criterion and RC3H, along the stem up to 8 meters height. After the volume evaluation of standing trees they were felled and the diameter obtained with a caliper and a tape in the same positions in which the non-destructive measures were taken. Wood disks were removed and dried for determination of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biomass Criterion Masser RCH3 Empirical models Quantificação de Biomassa; Criterion; RC3H da Masser; Modelos empíricos. |
| Ano: 2012 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/329 |
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| Arruda, Daniel Meira; Batista, Márcio Luiz; Simão, Marcos Vinicius Ribeiro de Castro; Duque-Brasil, Reinaldo; Ferreira-Júnior, Walnir Gomes; Schaefer, Carlos Ernesto Gonçalves Reynald. |
| The dry forests, widely distributed in Brazil, are formations subject to different sampling method. Consequently, the data generated may affect the comparison among other vegetation formations. Therefore, this study presents and discusses changes caused by sampling vegetation using circumference at soil height (CSH) ≥ 10 cm and circumference at breast height (CBH) ≥ 15 cm. Different criteria provide an ambiguous vision of a same forest fragment, resulting in different structure and species richness. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phytosociology; Sampling methodology; Seasonally Tropical Dry Forest; Arboreal Caatinga Fitossociologia Fitossociologia; Métodos de amostragem; Mata Seca; Caatinga Arbórea. |
| Ano: 2012 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/380 |
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| Maeda, Shizuo; Silva, Helton Damin da; Bellote, Antonio Francisco Jurado. |
| The aim of this work was to evaluate, in vase, the effect of cellulosic residue in soil and chemical characteristics of effluents resulting from that application in Litholic Humic Neosol layers collected in the 0 to 10 and 10 cm to 30 cm. Doses of sludge, equivalent to 0, 10, 20, 40 and 80 Mg ha-1 were implanted in a randomized design. Aliquots corresponding to doses of sludge, collected on the treatment were mixed to the soil layer of 0 to 10 cm and placed in vessels after the completion of the soil layer from 10 cm to 30 cm. At 117 days after implantation of the test, samples were collected from the soil layer from 0 to 20 cm and from the effluent resulting from the application of water for irrigation. The treatments changed the characteristics... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil attributes cellulosic residue. solos; Atributos químicos; Resíduo celulósico.. |
| Ano: 2010 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/145 |
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| Registros recuperados: 587 | |
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