9 research outputs found

    CALIBRAÇÃO DO MODELO 3-PG PARA Eucalyptus saligna Smith NA REGIÃO DE GUAÍBA - RS

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    http://dx.doi.org/10.5902/1980509818447The study aimed to calibrate the model 3-PG for Eucalyptus saligna for the following the diameter variables at breast height (DBH), total height, wood volume and branch, bark and wood biomass. The study took place in the region of Guaíba, Rio Grande do Sul state, Brazil. Clonal plantations of Eucalyptus saligna in various spacings were used. Six different ages were selected along the crop cycle (2nd to 7th year). After the forest inventory was carried out, the biomass of three trees fractionated into wood, bark, branches and leaves was collected. The biomass of roots on the average tree of each plot was measured to a depth of 1 m. Physical and chemical analyses were performed in soil samples from the layers: 0 to 20 cm, 20 to 40 cm and 40 to 100 cm. Litter deposition was estimated by allocating 4 square collectors of 0.5 m². The leaf area was obtained through digital photographs and thus the specific leaf area was estimated. The physiological parameters were measured in six plots, one at each age. Climatic parameters were provided by EEA of UFRGS University, located in Eldorado do Sul, RS state. The model validation was not statistically accepted, but their estimated data can be used to estimate the studied variables, demonstrating the potential of its use although additional studies for the application of the model to this species are still needed.http://dx.doi.org/10.5902/1980509818447O trabalho teve como objetivo calibrar o modelo 3-PG para Eucalyptus saligna usando as varáveis diâmetro a altura do peito (DAP), altura total, volume de madeira e biomassa de galho, casca e lenho. O estudo ocorreu na região de Guaíba - RS, sendo utilizados plantios clonais de Eucalyptus saligna, em diversos espaçamentos. Foram selecionadas seis idades ao longo do ciclo de cultivo (2º ao 7º ano). Realizou-se o inventário florestal para a coleta de biomassa (três árvores, sendo fracionadas em: lenho, casca, galhos e folhas). Na árvore média de cada parcela, mensurou-se a biomassa de raízes até a profundidade de 1 m. Análises físicas e químicas em amostras de solo foram realizadas nas camadas de 0 a 20 cm, 20 a 40 cm e 40 a 100 cm. A deposição de serapilheira foi estimada através da alocação de quatro coletores quadrados de 0,5 m². A área foliar foi obtida por fotografias digitais e, a partir destas, estimou-se a área foliar específica. Os parâmetros fisiológicos foram mensurados em seis parcelas, uma em cada idade. Os parâmetros climáticos foram fornecidos pela EEA da UFRGS, localizada em Eldorado do Sul. A validação do modelo não foi estatisticamente aceita, mas os seus dados estimados podem ser utilizados para estimar as variáveis estudadas, evidenciando o potencial do seu uso, porém, com a necessidade de estudos adicionais

    ARBORIZAÇÃO DE VIAS PÚBLICAS DO BAIRRO CAMOBI, SANTA MARIA, RS.

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    http://dx.doi.org/10.5902/223611706207This study inventoried the trees on public roads five villages of Camobi neighborhood, Santa Maria- RS. The most frequent species had their morphometric patterns evaluated and measured. It´s1348 trees were recorded, distributed in 61 species, 28 native and 33 exotic. The higher frequencyof individuals was observed for the species: Lagerstroemia indica L., Caesalpinia peltophoroides,Melia azedarach L., Inga marginata Willd., Ligustro lucidum W. T. Aiton, Handroanthuschrysotrichus (Mart. ex DC) Mattos e Eugenia uniflora L., corresponding to 61% of all trees. Due tothe increase in built-up areas in the city, there was a reduction in the number of individuals, whichis also reflected in the age of the trees in the Camobi.http://dx.doi.org/10.5902/223611706207Neste estudo foram inventariadas as árvores das vias públicas de cinco Vilas do bairro Camobi, Santa Maria – RS. As espécies mais frequentes tiveram seus padrões morfométricos avaliados e mensurados. Foram contabilizadas 1348 árvores, distribuídas em 61 espécies, 28 nativas e 33 exóticas. A maior frequência de indivíduos foi observada para as espécies de: Lagerstroemia indica L., Caesalpinia peltophoroides, Melia azedarach L., Inga marginata Willd., Ligustro lucidum W. T. Aiton, Handroanthus chrysotrichus (Mart. ex DC) Mattos e Eugenia uniflora L., correspondendo a 61% do total de árvores. Devido ao aumento de áreas construídas na cidade, ocorreu redução no número de indivíduos, o que também refletiu na idade da arborização do bairro.

    EXPORT AND NUTRITIONAL REPLACEMENT IN THE FIRST THINNING OF Pinus taeda L. IN A SECOND ROTATION AREA

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    <p>This study aimed to quantify biomass, the export and nutrient replacement in trees of a first thinning <em>Pinus taeda</em> L. stand, in Cambará do Sul, RS state. To do so, a forest inventory was done in three plots (60 m x 60 m), where three trees were cut in each plot. Live and dead needles, live and dead branches, bark, wood (bole) and wood from tip with bark, were measured. Total biomass was 44,5 Mg ha<sup>-1</sup>, being 62,8% of bole wood, 10,3% live branches, 8,9% bark, 10,1% live needles, 6,1% dead branches, 3,5% of wood from tip with bark and 0,5% dead needles. Total nutrients in biomass, in kg ha<sup>-1</sup>, was: 100,5 of N; 51,1 of Ca; 46,8 of K; 18,2 of S; 14,3 of Mg; 11,7 of P; 0,599 of Mn; 0,158 of Fe; 0,435 of Zn; 0,181 of B and 0,177 of Cu. The quantity of the fertilizer to be replaced will depend on the exploration type. If the total biomass occurs, the quantity of the fertilizers to be replaced will be of 391 kg ha<sup>-1</sup>, and if it is considered just the wood harvest this replacement will be 60% inferior, 169 kg ha<sup>-1</sup>.</p

    APORTE DE SERAPILHEIRA E NUTRIENTES EM UMA FLORESTA ESTACIONAL DECIDUAL NA REGIÃO CENTRAL DO RIO GRANDE DO SUL

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    The objective of this study was to quantify the deposition and nutrients input by litter in the fragment of Seasonal Deciduous Forest, in Itaara, Rio Grande do Sul state, Brazil. Thirty circular metal collectors were allocated in six plots. The deposited material in this structure was separated in leaves, identified by species, fine branches (diameter autumn>winter>summer. The nutrients input follow the order: N>Ca>K>Mg>S>P (macronutrients) and Fe>Mn>B>Zn>Cu (micronutrients). The higher nutrient depositions by litter was Parapiptadenia rigida, following of Ocotea pulchella and Matayba elaeagnoides

    CALIBRATION OF MODEL 3-PG FOR Eucalyptus saligna IN THE REGION OF GUA\ucdBA, RIO GRANDE DO SUL STATE

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    O trabalho teve como objetivo calibrar o modelo 3-PG para Eucalyptus saligna usando as var\ue1veis di\ue2metro a altura do peito (DAP), altura total, volume de madeira e biomassa de galho, casca e lenho. O estudo ocorreu na regi\ue3o de Gua\uedba - RS, sendo utilizados plantios clonais de Eucalyptus saligna, em diversos espa\ue7amentos. Foram selecionadas seis idades ao longo do ciclo de cultivo (2\uba ao 7\uba ano). Realizou-se o invent\ue1rio florestal para a coleta de biomassa (tr\ueas \ue1rvores, sendo fracionadas em: lenho, casca, galhos e folhas). Na \ue1rvore m\ue9dia de cada parcela, mensurou-se a biomassa de ra\uedzes at\ue9 a profundidade de 1 m. An\ue1lises f\uedsicas e qu\uedmicas em amostras de solo foram realizadas nas camadas de 0 a 20 cm, 20 a 40 cm e 40 a 100 cm. A deposi\ue7\ue3o de serapilheira foi estimada atrav\ue9s da aloca\ue7\ue3o de quatro coletores quadrados de 0,5 m\ub2. A \ue1rea foliar foi obtida por fotografias digitais e, a partir destas, estimou-se a \ue1rea foliar espec\uedfica. Os par\ue2metros fisiol\uf3gicos foram mensurados em seis parcelas, uma em cada idade. Os par\ue2metros clim\ue1ticos foram fornecidos pela EEA da UFRGS, localizada em Eldorado do Sul. A valida\ue7\ue3o do modelo n\ue3o foi estatisticamente aceita, mas os seus dados estimados podem ser utilizados para estimar as vari\ue1veis estudadas, evidenciando o potencial do seu uso, por\ue9m, com a necessidade de estudos adicionais.The study aimed to calibrate the model 3-PG for Eucalyptus saligna for the following the diameter variables at breast height (DBH), total height, wood volume and branch, bark and wood biomass. The study took place in the region of Gua\uedba, Rio Grande do Sul state, Brazil. Clonal plantations of Eucalyptus saligna in various spacings were used. Six different ages were selected along the crop cycle (2nd to 7th year). After the forest inventory was carried out, the biomass of three trees fractionated into wood, bark, branches and leaves was collected. The biomass of roots on the average tree of each plot was measured to a depth of 1 m. Physical and chemical analyses were performed in soil samples from the layers: 0 to 20 cm, 20 to 40 cm and 40 to 100 cm. Litter deposition was estimated by allocating 4 square collectors of 0.5 m\ub2. The leaf area was obtained through digital photographs and thus the specific leaf area was estimated. The physiological parameters were measured in six plots, one at each age. Climatic parameters were provided by EEA of UFRGS University, located in Eldorado do Sul, RS state. The model validation was not statistically accepted, but their estimated data can be used to estimate the studied variables, demonstrating the potential of its use although additional studies for the application of the model to this species are still needed

    Qualidade química do solo com diferentes níveis de degradação em área de preservação permanente

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    The objective of this study was to investigate possible effects of soil contamination from pollution by urbanization and inordinate use of the course on the shores of the Sanga Lagoão of Ouro through soil chemical variables analyzed with multivariate statistical tools. We established five sampling points in the path of urban Sanga that have different uses and management. Alterations in the characteristics of soil in accordance with the management imposed. Similarity was observed the formation of three patterns chemical characteristics: soil fertility (1), acidity (2), and the amount of MO, N and K (3) in the soil. Four factors (represented by F1, F2, F3 and F4), explained 88.34% of the total variation of the data, and the factor F1 is the greatest explanation of the variance, with 48% and group characteristics related to soil fertility. In the correlation matrix of variables 38.6% of the correlations are significant indicating a good fit for factor analysis.O objetivo deste trabalho foi verificar possíveis efeitos das contaminações do solo decorrente da poluição pela urbanização e uso desordenado nas margens do curso da Sanga lagoão do Ouro através de variáveis químicas do solo analisadas com ferramentas de estatística multivariada. Foram estabelecidos cinco pontos de amostragem no percurso urbano da Sanga que possuem diferentes usos e manejos. Houve alterações nas características químicas do solo de acordo com o manejo imposto. Por similaridade, observou-se a formação de três padrões de características químicas: fertilidade do solo (1), acidez (2), e pela quantidade de MO, N e K (3) presente no solo. Quatro fatores (representados por F1, F2, F3 e F4), explicaram 88,34% da variação total dos dados, sendo que o fator F1 representa a maior explicação da variância, com 48% e agrupa características relacionadas à fertilidade do solo. Na matriz de correlação das variáveis 38,6% das correlações são significativas indicando uma boa adequação para Análise Fatorial
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