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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Miškų produktyvumo vertinimas / The research of forest yield capacity

Samulionytė, Jurgita 16 June 2006 (has links)
Study object. The state managed forests of Middle Lithuanian plain landscape geographical region (Kedainiai, Birzai, Joniskis, Kaunas, Pakruojis and Panevezys forest enteprises) and Nemunas bottom-land plain geographical region (Tauragė, Jurbarkas, Sakiai, Kazlu Ruda and Marijampole forest enterprises). Study aim. To evaluate the forest yield capacity of nature and administrative units. Methodology. The forest yield capacity is evaluated by calculating the mean volume per hectare and by assessing the yield capacity using the methodology of S. G. Sinicin. Results. There was made a comparison of forest yield capacity between two geographical landscape regions (Middle Lithuanian plain and Nemunas bottom-land plain). It was assessed that the mean volume per hectare in Middle Lithuanian plain is 5,2% and the forest yield capacity (according to S.G. Sinicin) is 3,8 % higher than in Nemunas bottom-land plain geographical region. Further on it was made comparison between the mean volume and forest yield capacity per hectare in forest enterprises in these two geographical regions. It was assessed that the highest mean volumes have Kazlų Rūda, Šakiai and Marijampolė forest enterprises. The highest yield capacities (according to S.G. Sinicin) have Taurage, Jurbarkas and Šakiai forest enterprises. Key words: Middle Lithuanian plain landscape geographical region, Nemunas bottom-land plain landscape geographical region), forest yield capacity, mean volume per hectare. s 1 ha.
2

Caracterização dendrométrica e avaliação econômica de povoamentos de eucalipto para multiprodutos / Dendrometric characterization and economic evaluation of Eucalyptus stands for multiproduct

Santos, Felipe Rodrigues 28 September 2010 (has links)
Made available in DSpace on 2016-12-23T13:51:49Z (GMT). No. of bitstreams: 1 Dissertacao de Felipe Rodrigues Santos.pdf: 2322223 bytes, checksum: 0a4e2ac2777ef4dfa460bbad962daa00 (MD5) Previous issue date: 2010-09-28 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Este estudo de caso teve como objetivos obter informações de produção de quatro povoamentos clonais de eucalipto; avaliar funções de afilamento e quantificar a madeira para uso único e multiprodutos; avaliar economicamente as possibilidades de uso da madeira; e dar suporte para tomada de decisão a empreendedores interessados em investir na atividade de silvicultura de eucalipto. Quatro povoamentos de clones híbridos de eucalipto, com idades de 77 (povoamento 1), 72 (povoamento 2), 53 (povoamento 3) e 40 meses (povoamento 4), localizados no município de Jerônimo Monteiro, ES, foram inventariados com alocação aleatória de 10 parcelas, em cada povoamento, medindo-se as variáveis CAP e H. Foram cubadas árvores e obtido o volume pela fórmula de Smalian. Foram ajustados modelos hipsométricos e de volume e calculados a média dos diâmetros, diâmetro médio, área basal por hectare e média das alturas para cada povoamento. Em seguida foram ajustados os modelos de afilamento em sua forma original: Kozak et al. (1969), Demaerschalk (1972), Ormerod (1973) e Schöepfer (1966). A seleção dos modelos para estimar altura comercial nos diâmetros 14, 12, 10, 8, 7 e 6 cm e volume comercial nos diâmetros 14, 7 e 6 cm deu-se pela aplicação dos critérios estatísticos em conjunto com a análise gráfica dos resíduos. Nos povoamentos 1, 2 e 3 foram determinadas as produções de uso único para celulose e energia, e no povoamento 4 para energia, bem como a produção combinada destes usos com a possibilidade de parte do fuste para mourões. Assim, foram determinadas a produção combinada de celulose e mourões para os povoamentos 1, 2 e 3, e energia e mourões para o povoamento 4. Para a avaliação econômica foram aplicados os métodos VPL, BPE e CMP. Observou-se que a média dos diâmetros, diâmetro médio e área basal apresentaram relação direta com a idade dos povoamentos. Os resultados dos ajustes dos modelos mostraram diferença no perfil do fuste entre os povoamentos. O aproveitamento da madeira de uso único para celulose foi maior no povoamento 1 (97%), seguido do povoamento 3 (90%) e 2 (80%). Para energia, a proporção foi maior nos povoamentos 1 e 4 (99 e 94%,respectivamente) em relação ao 2 e 3 (86 e 91%, respectivamente). Para multiprodutos, observou-se que os povoamentos 3 e 4 apresentaram maior proporção de uso da madeira para mourões em relação à celulose e energia. O uso da madeira para energia mostrou-se inviável economicamente em todas as situações avaliadas. Já, para celulose, sob uma taxa de juros baixa, mostraram-se viáveis economicamente. No entanto, os povoamentos 2 e 3 foram mais sensíveis à variação de aumento na taxa de juros em relação ao povoamento 1. O uso da madeira para multiprodutos foi alternativa mais viável para os quatro povoamentos. O CMP mostrou-se sensível quanto às variações de idade, taxa de juros e uso da madeira / This case study aimed to obtain information for the production of four clones Eucalyptus stands; to evaluate taper functions and quantify the wood to use single and multiproduct; economically evaluate the potential use of wood, and support for decision-making entrepreneurs interested in investing in the forestry of Eucalyptus. Four stands of Eucalyptus hybrid clones, aged 77 (stand 1), 72 (stand 2), 53 (stand 3) and 40 months (stand 4), located in the town of Jerônimo Monteiro, ES, were surveyed with random of 10 plots in each stand, measuring variables CAP and H. Trees were scaled and obtained the volume by Smalian s formula. Hypsometric and volume models were adjusted and calculated the mean diameter, quadratic mean diameter, basal area per hectare and average height for each stand. Then the taper models were adjusted in its original form: Kozak et al. (1969), Demaerschalk (1972), Ormerod (1973) and Schöepfer (1966). The selection of models to estimate the commercial height in the diameters 14, 12, 10, 8, 7 and 6 cm and trade volume in the diameter 14, 7 and 6 cm was due to the application of statistical criteria in conjunction with the graphic analysis of residues. In stands 1, 2 and 3 were determined use single products for pulp and energy, and the stand 4 for energy, as well as the combined production of these uses with the possibility that some of the stem for fencepost. Thus, were determined the production combined of pulp and fencepost for stands 1, 2 and 3, and energy and fencepost to the stand 4. For the economic evaluation were applied the methods NPV, EPB and APC. It was observed that the mean diameter, quadratic mean diameter and basal area were directly related with age. The results of the adjustment of the models showed a difference in the profile of the stem between the stands. The use of wood of single use for pulp was higher in stand 1 (97%), followed by stand 3 (90%) and 2 (80%). For energy, the proportion was higher in stands 1 and 4 (99 and 94%, respectively) compared to 2 and 3 (86 and 91%, respectively). For multiproduct, it was observed that stands 3 and 4 had a higher proportion of use of wood for fencepost in relation to pulp and energy. The use of wood for energy has proven to be uneconomical in all situations evaluated. Already, for cellulose, in a low interest rate, proved to be economically viable. However, the stands 2 and 3 were more sensitive to variation in the interest rate in relation to stand 1. The use of wood for multiproduct was more viable alternative to the four stands. The APC was sensitive for changes in age, interest rate and use of wood
3

Ökonomische Analyse forstlicher Bestandesbehandlung / Economic Analysis of Forest Stand Management

Koster, Roman 11 September 2020 (has links)
No description available.

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