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Registros recuperados: 6
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A complementary strategy for the conservation of native forest tree species: retrieval and conservation of threatened ecotypes PFB - Pesquisa Florestal Brasileira
Shimizu, Jarbas Yukio.
Deforestation has become rampant in recent years in Brazil and has affected all biomes where manyspecies are threatened to extinction due to destruction natural habitats. Government initiatives to hinder thechain of destruction include two main lines of action: to establish conservation units (parks, reserves andothers); and programs to encourage plantation of native tree species for reclamation of degraded ecosystems, restoration of forests on permanent protection areas (riparian, and steep slope environments), and establishment of “legal reserves” (a mandatory forest reserve on at least 20% of the land area). Conservation units are effectivein conserving natural ecosystems. However, they are of limited value for the conservation of ecotypes, sincetheir...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Inbreeding; Outbreeding; Extinction; Gene conservation Endogamia; Exogamia; Extinção; Conservação; Germoplasma.
Ano: 2010 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/125
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Evaluation and genetic progress in volume of grevilea provenances at three different environment PFB - Pesquisa Florestal Brasileira
Martins, Emerson Gonçalves; Neves, Edinelson José Maciel; Shimizu, Jarbas Yukio; Ferreira, Carlos Alberto.
Twenty one provenances of Grevillea robusta Cunn were tested at Nova Esperança and Quedas do Iguaçu, Paraná state and Anhembi, São Paulo state, Brazil. With the aim of comparing the performance of the original provenances with the comercial provenance collected in Maringa, Paraná state included as a control. Provenance trials were installed in a randomized block design with rectangular plots, each one with six plants spaced 3 m x 3 m, with 15 replications. Five among the ten best provenances at Anhembi presented better growth at Quedas do Iguaçu and Nova Esperança (Duck Creek, Fine Flower, Rappville, Bottle Creek and Mc Pherson’s Creek). Different environments did not interfere significantly in the average growth among different provenances indicating that...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Grevillea robusta; Ganho genético; Procedências; Madeira.
Ano: 2003 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1614
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Expected gain in selection of Pinus elliottii var. elliottii for timber production at an early age PFB - Pesquisa Florestal Brasileira
Moreira, Juliana Prado; Shimizu, Jarbas Yukio; Sousa, Valderês Aparecida; Moraes, Mario Luis Teixeira de; Moura, Nara Fernandes; Aguiar, Ananda Virgínia de.
P. elliotii var. elliottii is the second most planted fast growing tree species in Brazilian subtropics for wood and resin production. The objective of this work was to predict genetic values of fast growing individual trees. A trial was established in a randomized complete blocks design involving 76 treatments, 75 open pollinated progenies from a clonal seed orchard and a commercial progeny as control, in a 3 m x 3 m spacing. Total heights of all individuals were measured at 1, 2, and 3 years old and also stem diameter at 1.3 m height- dbh at 3 years old. Deviance analysis was performed by using Selegen-REML/BLUP software and genetic parameters were estimated. Significant variation was detected among progenies. Estimates of narrow-sense individual...
Tipo: Info:eu-repo/semantics/article Palavras-chave: REML/BLUP; Genetic improvement; Genetic diversity; Repeatability; Heritability Melhoramento florestal REML/BLUP; Correlações; Diversidade genética; Ganho de seleção; Melhoramento genético.
Ano: 2014 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/488
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Genetic selection Pinus greggii progeny to the establishment of seed orchards PFB - Pesquisa Florestal Brasileira
Aguiar, Ananda Virgínia de; Sousa, Valderês Aparecida de; Shimizu, Jarbas Yukio.
The main deterrent to the adoption of new species for operational plantations is the availability of  genetically improved seeds in sufficient amount to supply the  market. Therefore, this study was carried out with the objective to estimate genetic parameters for individual selection as a basis to transform the field trial into a seedling seed orchard. The trial contained forty seven half-sib families from five Mexican provenances, including northern and central Mexico sources. These were planted at Ponta Grossa, Paraná State, Brazil, in arandomized complete block design with nine  replications of five-tree linear plots in a 3 m x 3 m spacing. Height, dbh (diameter at breast height) and stem form were assessed in thirteen-year old tree. Variance...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Breeding; Heritability; Expected progress. Melhoramento genético; Herdabilidade; Progresso esperado..
Ano: 2010 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/94
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Japanese red cedar as an alternative species for wood production in the State of Paraná PFB - Pesquisa Florestal Brasileira
Shimizu, Jarbas Yukio; Maiochi, Riceli Antunes.
Japanese red cedar (Cryptomeria japonica (L. F.) D. Don.) is an important alternative tree species forwood production in the State of Paraná. This study reports on the performance of this species from different geographic origins in comparison to a previously introduced population of unknown origin. The test plantations were established in three locations in the State of Paraná. The sites differed in soil types as well as in mean annual rainfall. Provenance performances varied in frost tolerance and in growth traits. Among planting sites, Cantagalo was the most productive due to better soil quality than in other sites. Also, the mean annual rainfall at Cantagalo site is higher (1,831 mm) than in Rio Negro and Colombo (1,420 mm and 1,407 mm, respectively)....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cryptomeria japonica; Origins; Site quality; Productivity. Cryptomeria japonica; Origens; Qualidade de sítio; Produtividade.
Ano: 2010 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/128
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Sweetgum for wood production in the South and Southeastern Brazil PFB - Pesquisa Florestal Brasileira
Shimizu, Jarbas Yukio.
Sweetgum is a North and Central American tree species well known for the healing gum since the times of the Aztec civilization. In the southern United States, this is the most widely planted broadleaf species for wood  production. It grows well on a variety of site conditions, including on alluvial soil prone to flooding. As a result  of the wide natural distribution, it shows important variations in phenology and growth traits. The more  northern provenances tend to shut down growth processes much earlier and resume them later than the southern sources. These variations reflect directly on  the growth patterns among seed sources. Experiments  in several sites have demonstrated its potential value for wood production in small wood lots in the South and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Provenances; Invasive species; Alternative species Procedências; Espécie invasora; Espécie alternativa.
Ano: 2011 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/246
Registros recuperados: 6
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