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Improving Planting Stocks for the Brazilian Atlantic Forest Restoration through Community-Based Seed Harvesting Strategies

Brancalion, Pedro Henrique Santin; Viani, Ricardo Augusto Gorne; Aronson, James; Rodrigues, Ricardo Ribeiro; Nave, André Gustavo
Fonte: WILEY-BLACKWELL; HOBOKEN Publicador: WILEY-BLACKWELL; HOBOKEN
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
46.18%
High-diversity reforestation can help jumpstart tropical forest restoration, but obtaining viable seedlings is a major constraint: if nurseries do not offer them, it is hard to plant all the species one would like. From 2007 to 2009, we investigated five different seed acquisition strategies employed by a well-established tree nursery in southeastern Brazil, namely (1) in-house seed harvesters; (2) hiring a professional harvester; (3) amateur seed harvesters; or (4) a seed production cooperative, as well as (5) participating in a seed exchange program. In addition, we evaluated two strategies not dependent on seeds: harvesting seedlings from native tree species found regenerating under Eucalyptus plantations, and in a native forest remnant. A total of 344 native tree and shrub species were collected as seeds or seedlings, including 2,465 seed lots. Among these, a subset of 120 species was obtained through seed harvesting in each year. Overall, combining several strategies for obtaining planting stocks was an effective way to increase species richness, representation of some functional groups (dispersal syndromes, planting group, and shade tolerance), and genetic diversity of seedlings produced in forest tree nurseries. Such outcomes are greatly desirable to support high-diversity reforestation as part of tropical forest restoration. In addition...

Nutrição, crescimento, eficiência de uso de água e de nutrientes em povoamentos de Eucalyptus grandis fertilizados com potássio e sódio; Tree growth, nutritional status, water use efficiency and nutrients use efficiency in Eucalyptus grandis plantation fertilized with potassium and sodium in Brazil

Almeida, Julio Cesar Raposo de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 12/08/2009 PT
Relevância na Pesquisa
35.97%
Para avaliar os efeitos da fertilização potássica e sódica sobre a resposta do Eucalyptus grandis em crescimento, estado nutricional, eficiência de uso de água e de nutrientes foi instalado na Estação Experimental de Ciências Florestais de Itatinga (SP) em LVA distrófico (200 g kg-1 de argila) um experimento em blocos ao acaso contendo sete tratamentos: Testemunha, K1,5, K3,0, K4,5, KS3,0, Na3,0 e K1,5+Na1,5 (os valores correspondem à quantidade de K ou Na fornecidos em kmol ha-1, sob as formas de KCl, K2SO4 e NaCl). O nível crítico de K foliar variou de 6,6 a 5,0 g kg-1 e as amostragens realizadas no final da estação de chuvas (maio) sempre proporcionaram melhor avaliação do estado nutricional. A fertilização potássica elevou a resistência e/ou tolerância à ferrugem (Puccini pisidii Winter.). A concentração de Na na idade de 6 meses foliar atingiu 3,4 e 2,3 g kg-1 nos tratamentos Na3,0 e K1,5+Na1,5, mas o crescimento das árvores as concentrações reduziram para valores < 1,0 g kg-1, 36 meses pós-plantio. O Eucalyptus grandis foi capaz de absorver o Na e o transportar até as folhas, mantendo a relação K/Na >1 (elevada), uma característica relacionada às plantas tolerantes ao Na e à salinidade. A resposta do Eucalyptus grandis à fertilização potássica e sódica foi expressiva...

O Parque da Água Branca: o manejo sustentável de uma floresta urbana; Água Branca Park: the sustainable management of an urban forest

Lagoa, Maria Helena Britto
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 01/04/2008 PT
Relevância na Pesquisa
36.01%
O presente estudo avaliou o Parque Estadual Dr. Fernando Costa, também chamado Parque da Água Branca, localizado na zona oeste da capital paulista, suas características, suas particularidades sociais e ambientais e sua composição arbórea, como parte da Floresta Urbana de São Paulo, descrevendo sua evolução ao longo do século XX, até a atualidade. Teve por objetivo definir um conjunto de ações e estratégias sustentáveis, na busca de um equilíbrio entre as formas de uso do parque e a conservação de seus recursos naturais. Para tanto, analisou os meios físico, sócio-econômico e biológico. A investigação do meio físico foi feita através de análises das condições de suas estruturas construídas e do processo de esgotamento de uma de suas nascentes. A avaliação do meio sócio-econômico foi feita por meio da aplicação de 152 entrevistas com usuários do Parque, observando seu grau de conscientização quanto à importância e aos benefícios das áreas verdes na melhoria do ambiente e na qualidade de vida, além de seu grau de satisfação quanto aos elementos que o parque oferece. O meio biológico foi estudado através do cadastramento e diagnóstico geral da vegetação arbórea presente no local. Os dados de campo mostraram a ocorrência de 99 espécies de árvores...

Comportamento de clones de eucalipto em resposta a disponibilidade hídrica e adubação potássica

Mendes, Hélio Sandoval Junqueira
Fonte: Universidade Estadual Paulista (UNESP) Publicador: Universidade Estadual Paulista (UNESP)
Tipo: Dissertação de Mestrado Formato: ix, 43 f.
POR
Relevância na Pesquisa
35.75%
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Pós-graduação em Agronomia (Genética e Melhoramento de Plantas) - FCAV; O trabalho objetivou avaliar o efeito do suprimento de potássio no desempenho de clones de eucalipto submetidos a duas condições de disponibilidade hídrica em casa de vegetação utilizando características biométricas e fisiológicas. Cinco genótipos de eucalipto foram submetidos a dois níveis de adubação potássica (K0 – sem complementação potássica e K1 – adição de 166 mg.dm-3 de K) e a dois regimes de irrigação (RI1 – irrigação diária, até o solo atingir 60% dos poros preenchidos com água (PPA), ou seja, plantas sem restrição hídrica, e RI2 - plantas irrigadas até o solo atingir 60% PPA, com posterior suspensão da irrigação, até o aparecimento de sintomas iniciais de deficiência hídrica). Foram conduzidos sete ciclos de suspensão de irrigação, sendo a quantidade de água reposta em cada vaso determinada pelo método gravimétrico. No início e ao final do experimento, foram avaliados o diâmetro do coleto, a altura, o número de folhas, a área foliar e a massa de matéria seca de folhas, caule, raízes, da parte aérea e total. Nos momentos de máximo estresse hídrico...

Divergência genética entre clones de eucalipto por caracteres biométricos e fisiológicos sob deficiência hídrica

Revolti, Paola Mazza
Fonte: Universidade Estadual Paulista (UNESP) Publicador: Universidade Estadual Paulista (UNESP)
Tipo: Dissertação de Mestrado Formato: 68 f.
POR
Relevância na Pesquisa
35.75%
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Pós-graduação em Agronomia (Genética e Melhoramento de Plantas) - FCAV; O presente trabalho objetivou avaliar o desempenho de 40 clones de eucalipto submetidos a dois regimes de irrigação em casa de vegetação: RI1 - plantas sem restrição hídrica e RI2 - plantas cuja irrigação foi suspensa até o aparecimento de sintomas iniciais de deficiência hídrica (murcha). As plantas do regime RI2, ao final do ciclo de suspensão da irrigação, foram irrigadas de forma que o solo atingisse 21% de água (v/v), o que correspondeu a aproximadamente a 60% da capacidade máxima de retenção de água pelo solo; após isto, a irrigação foi novamente suspensa, repetindo-se o ciclo. No decorrer do experimento, foram conduzidos seis ciclos de estresse hídrico. No início e ao final do experimento, foram avaliados o diâmetro do coleto, a altura, o número de folhas, a área foliar e a massa de matéria seca de folhas, caule e raízes e da parte aérea, bem como a relação raiz-parte aérea e a massa por área de folhas. Nos momentos de máximo estresse hídrico, foram avaliadas as seguintes características: teor relativo de clorofila total (UR)...

A new probabilistic canopy dynamics model (SLCD) that is suitable for evergreen and deciduous forest ecosystems

Sainte-Marie, J.; Saint-Andre, L.; Nouvellon, Y.; Laclau, J. -P.; Roupsard, O.; le Maire, G.; Delpierre, N.; Henrot, A.; Barrandon, M.
Fonte: Elsevier B.V. Publicador: Elsevier B.V.
Tipo: Artigo de Revista Científica Formato: 121-133
ENG
Relevância na Pesquisa
26.13%
There are strong uncertainties regarding LAI dynamics in forest ecosystems in response to climate change. While empirical growth & yield models (G&YMs) provide good estimations of tree growth at the stand level on a yearly to decennial scale, process-based models (PBMs) use LAI dynamics as a key variable for enabling the accurate prediction of tree growth over short time scales. Bridging the gap between PBMs and G&YMs could improve the prediction of forest growth and, therefore, carbon, water and nutrient fluxes by combining modeling approaches at the stand level.Our study aimed to estimate monthly changes of leaf area in response to climate variations from sparse measurements of foliage area and biomass. A leaf population probabilistic model (SLCD) was designed to simulate foliage renewal. The leaf population was distributed in monthly cohorts, and the total population size was limited depending on forest age and productivity. Foliage dynamics were driven by a foliation function and the probabilities ruling leaf aging or fall. Their formulation depends on the forest environment.The model was applied to three tree species growing under contrasting climates and soil types. In tropical Brazilian evergreen broadleaf eucalypt plantations...

Estimativas de parâmetros genéticos para seleção precoce de clones de Eucalyptus para região com ocorrência de geadas

Moraes, Cristiano Bueno de; Moreira de Freitas, Talitha Casella; Pieroni, Gustavo Bloise; Vilela de Resende, Marcos Deon; Zimbacks, Leo; Mori, Edson Seizo
Fonte: Ipef-inst Pesquisas Estudos Florestais Publicador: Ipef-inst Pesquisas Estudos Florestais
Tipo: Artigo de Revista Científica Formato: 219-227
POR
Relevância na Pesquisa
35.85%
Further to increase the wood yield, is important goal of forest tree breeding the adaptation of clones through diverse environment, especially for soil and climate. Perennial tree species such as eucalypts, have a long life cycle and the frosts can occur and to be their limiting source of cultivation. The aim of the study was to determine the genetic variability and the genetic correlations between selection ages of clones cultivated in the municipality of Palma So la, SC, Brazil, where frosts are common in the winter. A clonal trial was set up in 2008 in Palma So la, by statistical design of randomized complete blocks considering 29 clones, six replications, six plants per plot, and 3.0m x 3.0 m spacing. The silvicultural characters of total plant height, diameter of breast height (dbh), and wood volume were evaluated through 24, 36, 48, and 60 months old. The deviance analysis and estimates of genetic parameters were based on the REML / BLUP genetic statistical procedure. Significant differences were observed for all traits in the deviance analysis. High correlations and statistically significant between characters were observed, indicating that the early selection will provide significant gains. Part of the clones USP/IPEF 64, USP/IPEF 78...

Genetic variation and realized genetic gain from rubber tree improvement

Gonçalves,Paulo de Souza; Aguiar,Adriano Tosoni da Eira; Costa,Reginaldo Brito da; Gonçalves,Elaine Cristine Piffer; Scaloppi Júnior,Erivaldo José; Branco,Roberto Botelho Ferraz
Fonte: São Paulo - Escola Superior de Agricultura "Luiz de Queiroz" Publicador: São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2009 EN
Relevância na Pesquisa
36.05%
Breeding cycle in rubber extends to 20-30 years between pollination and yield assessment, distributed over three selection stages. Five hectares of small scale trial of rubber tree [Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell.-Arg.], was established in the Northwestern region of São Paulo State, Brazil. The population comprises 98 clones mostly derived from intensively selected plus tree in the natural forest of rubber tree in the Amazon. Three open pollinated progeny tests were established in three experimental stations. Seedlings from 98 progenies including a commercial check (CC) were planted in each one of the three locations. Assessments were made when the plants were one, two and three years old. The variation among progenies for girth was highly significant in all locations examined. In the combined analysis of variance over three locations, differences among progenies were also detected, while progeny × location interaction effect was not significant. Narrow sense heritability estimates on individual tree basis (h i²) were variable depending on the characteristic, age of assessment and experimental location. Realized genetic gains were calculated for the plant characteristics at the age of three years, by comparing the performance of improved (selected) materials to unimproved materials (CC). The total genetic gain from the genetically tested first generation clone population at Votuporanga is estimated as 25% for girth...

Somatic Embryogenesis as a tool for forest tree improvement: a case- study in Eucalyptus globulus

Andrade, Gisele; Shah, Ravi; Johansson, Sofie; Pinto, Gloria; Egertsdotter, Ulrika
Fonte: BioMed Central Publicador: BioMed Central
Tipo: Artigo de Revista Científica
Publicado em 13/09/2011 EN
Relevância na Pesquisa
35.75%

Road Improvement and Deforestation in the Congo Basin Countries

Damania, Richard; Wheeler, David
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Tipo: Trabalho em Andamento
EN_US
Relevância na Pesquisa
36.2%
Road construction has often been viewed as the precursor to deforestation, especially in tropical forests. Traditional responses to such threats have been reactive, with attempts to mitigate impacts through physical measures, or the establishment of protected areas. These approaches often have not been entirely successful, especially in areas where economic potential is significant. This paper seeks to mitigate such conflicts by proposing a proactive approach to development planning and environmental policy. It develops a high-resolution spatial model of road improvement impacts that includes ecological risks and the economics of forest clearing. The approach is implemented by estimating the potential impact of road upgrading on forest clearing and biodiversity in eight Congo Basin countries. The paper demonstrates how the detailed analysis can identify areas of high ecological priority as well as areas at high risk of forest loss. The paper contributes to several aspects of the literature. First, it provides the most recent and reliable estimates of the drivers of deforestation in the Congo Basin...

Estimativas dos parâmetros genéticos para seleção de árvores de Eucalyptus

Moraes, Cristiano Bueno de; Brizolla, Thiago Fernandes; Teixeira, Lorena Gama; Zimback, Leo; Tambarussi, Evandro Vagner; Chaves, Raul; Teixeira de Moraes, Mario Luiz; Mori, Edson Seizo
Fonte: Ipef-inst Pesquisas Estudos Florestais Publicador: Ipef-inst Pesquisas Estudos Florestais
Tipo: Artigo de Revista Científica Formato: 623-629
POR
Relevância na Pesquisa
35.75%
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Eucalyptus grandis is the most commonly cultivated species in commercial stands in Brazil and throughout the world. The species is planted as a cultivar, by seed, e also by clonal plantings of its interspecific hybrids. The study have as objective to analyze the correlations between juvenile and at the end of rotation, aiming to get support for procedures of early selection in forest tree breeding programs. The experiments were set up in two trials in two localities: Angatuba and Lencois Paulista, both in Sao Paulo State, Brazil. The experimental design was randomized blocks, with 10 replications, six plants per plot, 3 x 2 spacing and 76 progenies. The diameter at breast height, plant height, and wood volume were the studied traits. The evaluations were made through the consecutive years (2, 3, 4, and 5 of age) in Lencois Paulista (Locality 2), and in Angatuba (Locality 1) where annual evaluations from de second to the sixth years of age were done. The results have shown that early selection for wood volume can be done by the 2 years of age, with 0.83 of genetic correlation with the age of final rotation (6 years), and it reaches the value of 0.93, between 3 and 6 years of age...

Eficiência da amostragem de matrizes de Cedrela Fissilis Vell. para melhoramento e conservação genética baseado em caracteres juvenis

Biernaski, Fabrício Antonio
Fonte: Universidade Federal do Paraná Publicador: Universidade Federal do Paraná
Tipo: Dissertação Formato: application/pdf
PORTUGUêS
Relevância na Pesquisa
26.27%
Conservation of local genetic variability of native forest tree species is important for maintaining the ecological balance of a region, as well as for allowing its future use in tree genetic improvement programs. Red-cedar (Cedrela fissilis Vell.) is a forest tree species of high value-added wood. However, the lack of genetically selected material and adequate silvicultural techniques for the species is a deterrent to its use in commercial forest plantations. Currently, there exists a strong demand of red-cedar saplings for environmental restoration, requiring materials that are both of high genetic variability and representatives of the region to be restored. This work aimed to assess the efficiency of sampling Cedrela fissilis trees for genetic improvement and conservation programs. A progeny test was established in a nursery with seeds from 48 sampled trees collected in the municipalities of Rio Negrinho, Mafra and São Bento do Sul, state of Santa Catarina, and in the municipalities of Lapa, Rio Negro, Campo do Tenente and Antonio Olinto, state of Paraná (33 sampled trees distributed among three sites and 15 trees dispersed in the studied region). The experiment was established in a randomized complete-block design, with 8 blocks and 20 plants per plot. The weight of 100 seeds per sampled tree was obtained. The following data were obtained for the saplings: emergency velocity index; sapling base diameter and height (at the intervals of 61...

Genetic improvement of forest tree species

Assis,Teotônio Francisco; Resende,Marcos Deon Vilela de
Fonte: Crop Breeding and Applied Biotechnology Publicador: Crop Breeding and Applied Biotechnology
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2011 EN
Relevância na Pesquisa
36.08%
Brazilian forestry sector is considered one of the most developed in the world, being the base for important industrial segments which use wood as raw material. Tree breeding has played an important role on improving the competitiveness of Brazilian forestry-based companies, especially for its positive reflexes on increasing adaptation, forestry productivity and wood quality. In spite of the importance of other forest trees for the economy, such as Schizolobium, Araucaria, Populus and Hevea, the main genera under genetic improvement in the country are Eucalyptus, Pinus, Acacia and Tectona. They are used by industries like pulp and paper, siderurgy, tannin, chips for exportation and lumber, constituting an important source of revenues for the Brazilian's economy, besides their positive social and environmental impacts. This paper presents a generic approach to genetic improvement aspects of these four major genera currently undergoing breeding in Brazil.

Análisis de la estructura genética espacial de especies arbóreas y su asociación con la variabilidad fenotípica y ambiental; Analysis of the spatial genetic structure in tree species and its association to phenotypic and environmental variability

Teich, Ingrid
Fonte: Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires Publicador: Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires
Tipo: info:eu-repo/semantics/doctoralThesis; tesis doctoral; info:eu-repo/semantics/publishedVersion Formato: application/pdf
Publicado em //2012 SPA
Relevância na Pesquisa
35.9%
Este trabajo aborda el análisis de estructura genética espacial (EGE) en especies arbóreas nativas de importancia para Argentina, y su asociación a otras variables, desde un enfoque interdisciplinar que incluye perspectivas biológicas y metodológicas. Mediante la revisión y comparación del desempeño de métodos estadísticos para detectar y caracterizar EGE, según distintos escenarios biológicos, se recomiendan estrategias analíticas para el estudio espacial de la variabilidad genética y su asociación con variables ambientales y fenotípicas. Se analizó la EGE a escala fina en un enjambre híbrido de Prosopis spp., encontrando significativa asociación de ésta con la variabilidad morfológica; información relevante para el ordenamiento del recurso genético algarrobo. También se analizó la correspondencia entre la variación espacial de la diversidad genética de poblaciones de Polylepis australis, a lo largo de su rango de distribución, y la inestabilidad del ambiente usando nuevos índices de heterogeneidad temporal del paisaje derivados de imágenes satelitales. Se concluye, que sitios ambientalmente más estables albergan mayores niveles de diversidad genética para esta especie. El estudio de EGE en árboles...

Remote sensing of hetergeneity in photosynthetic efficiency, electron transport and dissipation of excess light in Populus deltoides stands under ambient and elevated CO2 concentrations,and in a tropical forest canopy, using a new laser-induced fluorescence transient device

Ananyev, Gennady; Kolber, Zbigniew; Klimov, Dennis; Falkowski, Paul; Berry, Joseph; Rascher, Uwe; Martin, Robin; Osmond, C Barry
Fonte: Blackwell Publishing Ltd Publicador: Blackwell Publishing Ltd
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
35.98%
Determining the spatial and temporal diversity of photosynthetic processes in forest canopies presents a challenge to the evaluation of biological feedbacks needed for improvement of carbon and climate models. Limited access with portable instrumentation, especially in the outer canopy, makes remote sensing of these processes a priority in experimental ecosystem and climate change research. Here, we describe the application of a new, active, chlorophyll fluorescence measurement system for remote sensing of light use efficiency, based on analysis of laser-induced fluorescence transients (LIFT). We used mature stands of Populus grown at ambient (380 ppm) and elevated CO2 (1220 ppm) in the enclosed agriforests of the Biosphere 2 Laboratory (B2L) to compare parameters of photosynthetic efficiency, photosynthetic electron transport, and dissipation of excess light measured by LIFT and by standard on-the-leaf saturating flash methods using a commercially available pulse-modulated chlorophyll fluorescence instrument (Mini-PAM). We also used LIFT to observe the diel courses of these parameters in leaves of two tropical forest dominants, Inga and Pterocarpus, growing in the enclosed model tropical forest of B2L. Midcanopy leaves of both trees showed the expected relationships among chlorophyll fluorescence-derived photosynthetic parameters in response to sun exposure...

Parâmetros genéticos em teste de procedências e progênies de Toona ciliata M. Roemer var. australis; Genetic parameters in test of provenances and progeny of the Toona ciliata M. Roemer var. australis

Rosado, Lucas Rodrigues
Fonte: Universidade Federal de Lavras; Programa de Pós- Graduação em Engenharia Florestal; UFLA; brasil; Departamento de Ciências Florestais Publicador: Universidade Federal de Lavras; Programa de Pós- Graduação em Engenharia Florestal; UFLA; brasil; Departamento de Ciências Florestais
Tipo: Dissertação
Publicado em 17/12/2015 POR
Relevância na Pesquisa
45.98%
The increase the dimensions of the trees, by genetic improvement, without considering their architectures can make them mechanically unstable in situations of high winds. As consequence may occur falls, breaks and permanent buckling of stems, causing economic losses and environmental damage. In the present study had as objective to estimate genetic parameters and predict wood production gains with improvements in the trees architecture. It was used a test of provenances/progenies/plants of Toona ciliata M. Roemer var. australis, established in Campo Belo, MG, with 74 months old. This test involved 12 provenances of seeds widely distributed in the Australian east coast. Data of diameter to breast height (DBH), total tree height (Ht), volume (Vol), slenderness coefficient (S = Ht.DBH -1 ) and stem form (For), at 31, 54 and 74 months of age, there were obtained in individuals of 63 progenies from all provenances. The genetic parameters and prediction of genotypic values were estimated by REML/BLUP method. There was great genetic variability among and within provenances, showing that the test has an important role for the improvement and conservation of the species ex situ. Whereas the criterion of having a higher frequency of trees with low S or equal to 0.75...

Variação genética e ganhos obtidos por meio do melhoramento genético da seringueira; Genetic variation and realized genetic gain from rubber tree improvement

Gonçalves, Paulo de Souza; Aguiar, Adriano Tosoni da Eira; Costa, Reginaldo Brito da; Gonçalves, Elaine Cristine Piffer; Scaloppi Júnior, Erivaldo José; Branco, Roberto Botelho Ferraz
Fonte: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz Publicador: Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; Formato: application/pdf
Publicado em 01/02/2009 ENG
Relevância na Pesquisa
36.05%
Partindo-se da polinização à recomendação de clones para o plantio, o ciclo de melhoramento da seringueira, o qual compreende três ciclos de seleção leva em torno de 20-30 anos. Cinco hectares de uma população clonal de seringueira [Hevea brasiliensis Willd. ex Adr. de Juss.) Muell.-Arg.] foram instalados em Votuporanga, região Noroeste do Estado de São Paulo. A população inclui 98 clones, cuja maioria é derivada de árvores selecionadas na floresta nativa de seringueira na Amazônia. Três testes de progênies de polinização aberta foram conduzidos nas estações experimentais de Pindorama, Jaú e Votuporanga. Mudas de 98 progênies inclusive a testemunha (CC) foram plantadas em cada um dos três locais. Foram feitas avaliações quando as plantas apresentaram um, dois e três anos respectivamente. A variação entre progênies para crescimento de perímetro do caule foi altamente significantes em todos os locais testados. Nas análises de variâncias conjuntas com os três locais também foram observadas diferenças entre progênies, e que o efeito da interação progênie × local não foi significativo. Estimativas de herdabilidade no sentido restrito em nível de árvore individual (h i²) foram variáveis dependentes das características...

Soil seed bank analysis in a forest fragment with Araucaria angustifolia, State of Parana; ESTUDOS DE UM BANCO DE SEMENTES NO SOLO DE UM FRAGMENTO FLORESTAL COM Araucaria angustifolia NO ESTADO DO PARANÁ

Souza, Marcelo Lima de; Nogueira, Antônio Carlos; Macedo, Renato Luiz Grisi; Sanquetta, Carlos Roberto; Venturin, Nelson
Fonte: FUPEF DO PARANÁ Publicador: FUPEF DO PARANÁ
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Artigo Avaliado pelos Pares Formato: application/pdf
Publicado em 30/06/2011 POR
Relevância na Pesquisa
36.27%
A research on soil seed bank had been developed in an Araucaria angustifolia (Bert.) O. Ktze. forest fragment in the State of Paraná. It had surveyed vertical distribution of seeds within the soil and shadow influence on seedling emergence, besides the improvement of their identification and quantity measuring. Vertical distribution of seeds in four soil layers had been analyzed by identification and quantification of germinated seedlings in greenhouse, with full light or 50% shaded conditions. Data related to seedlings of trees, weeds, grasses and lianas were calculated separately in weekly intervals during a 210-day period. Results suggested that the soil seed bank in this forest was poor in relation to tree species, in diversity as far as density. On the other hand, seeds of grasses and weeds decreased along vertical soil profile, and forest tree species tended to abundance in the 5-10 cm layer. Germination was higher with full light than in 50% shaded conditions. Probably, regeneration strategy for most species in this focused area doesn’t seem to be soil seed bank.; O objetivo do presente trabalho foi estudar o banco de sementes no solo de um fragmento florestal com Araucaria angustifolia (Bert.) O. Ktze. no estado do Paraná. Para isso...

O USO DA CLASSIFICAÇÃO DE COPA DE DAWKINS COMO INDICADOR DO COMPORTAMENTO ECOLÓGICO DE ESPÉCIES ARBÓREAS TROPICAIS; The Dawkins’ crown classification as an indicator of the ecological behavior of tropical tree species.

Gonçalves, Delman de Almeida; Schwartz, Gustavo; Pokorny, Benno; van Eldik, Tim
Fonte: FUPEF DO PARANÁ Publicador: FUPEF DO PARANÁ
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Artigo Avaliado pelos Pares Formato: application/pdf
Publicado em 25/03/2010 POR
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26.27%
The knowledge about ecological behavior of tree species in tropical forests contributes for the efficiency and quality improvement of forest management. Thus, it makes necessary the development of practical and efficient methods for the ecological classification of different tree species, which can be used in short term surveys. This paper analyzed the ecological behavior as regards to the gradient of shade tolerance, using the Dawkins classification method for crown position and form, and relating these data with the individual developmental phase, which was estimated by the diameter breast height (DBH) measurement. The study was carried out in the management area of Precious Woods Pará company (Portel, PA, Brazil) in eight permanent sample plots of 0.5ha. Five species having different demand for direct solar radiation were analyzed: matamatá preto (Eschweilera blanchetiana [O. Berg] Miers, Lecythidaceae); maçaranduba (Manilkara huberi (Ducke) Chevalier, Sapotaceae); acapú (Vouacapoua americana Aubl., Fabaceae); andiroba (Carapa guianensis Aubl., Meliaceae); and taxi-preto (Tachigalia myrmecophyla (Ducke) Ducke, Fabaceae). The founded results, excepted for maçaranduba, corroborate the available ecological information about these species in literature...

A Programme for the Management of Forest Tree Genetic Resources in the Azores Islands

Ferreira,Miguel; Eriksson,Gösta
Fonte: Unidade de Silvicultura e Produtos Florestais Publicador: Unidade de Silvicultura e Produtos Florestais
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2006 EN
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46.18%
Since few forest tree gene conservation activities have been carried out in the Azores islands with its unique flora, it is urgent to develop a strategy for the management of the Azorean forest tree genetic resources. Safeguarding the potential for adaptation was identified as the prime objective for gene conservation of tree species in the Azores. Three species were identified of potential interest for tree genetic improvement. Prunus lusitanica spp azorica was selected due to its rarity and is close to extinction. Piconia azorica and Juniperus brevifolia spp azorica were selected based on their high wood quality and the interest in these trees by the Azorean Forest Service. Combined gene conservation and breeding was suggested for these species. The breeding of all of these species will follow the Multiple Population Breeding System concept. Open-pollinated seed will be collected for establishment of seedling seed orchards for each ecogeographic zone (cf Figure 4). Culling of trees with undesired characteristics will be carried out before seed collection. Seeds will be used for establishment of new progeny plantations. For Prunus lusitanica spp azorica only 1-2 seedling seed orchards are suggested. For the two other species several seedling seed orchards are suggested. For tree species not included in the breeding programme...