Métodos de amostragem e de determinação do teor de umidade da madeira em tora

• Ano de defesa: 2013
• Autor(a) principal: Donato, Danilo Barros
• Orientador(a): Carvalho, Ana Márcia Macedo Ladeira
• Banca de defesa: Santos, Rosimeire Cavalcante dos , Castro, Renato Vinícius Oliveira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Ciência Florestal
• Departamento: Manejo Florestal; Meio Ambiente e Conservação da Natureza; Silvicultura; Tecnologia e Utilização de
• País: BR
• Palavras-chave em Português: Erro admissível; Perfil de umidade; Diâmetro e comprimento da tora; Fatores de correção
• Palavras-chave em Inglês: Permissible error; Profile moisture; Diameter and length of the roundwood; Correction factors
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::TECNOLOGIA E UTILIZACAO DE PRODUTOS FLORESTAIS
• Link de acesso: http://locus.ufv.br/handle/123456789/3148

Even with the rising demand of roundwood utilization by many forestry companies, there are only a few studies of technics that search for the moisture content in a fast and precise way on the field, in addition to studies that could establish the optimum number of roundwood to be used as samples as a way to represent the real moisture content of piled wood in the field or even in the factory courtyard. So, the present paper pursued comparing two content sampling methods (Simple Casual Samping and Stratified Casual Sampling) to determine the optimum number of roundwood samples to obtain the moisture content of the population, evaluate the sample collecting and moisture content determination of roundwood and comparing them to the ABNT-NBR14929 norm.The samples were random collect from a 250 stwoodlot, 144 roundwood in four classes of diameter. Later, the moisture content of those samples were measured and from this values the population estimates by simple casual sampling (ACS) and by stratified casual sampling (ACE) were calculated, determining the optimum number of roundwood (n) to be sampled. For results of the number of roundwood to be sampled by ASC for each acceptable error 5; 10; 15; 20% were respectively 214; 55; 25 and 14 and for ACE (proportional) the number of roundwood to be sampled was 141; 35; 16; 9 and for ACE (Neymam) this number was 136; 34; 15 and 8 roundwood. The alternatives of sample collecting and moisture content determination in roundwood were measured using a moisture content analyzing scale; the samples were collected with a portable drill and a manual auger, collecting the samples in sawdust form. Capacitive and resistive electrical meters were also used. Because of eventual distortions among the results found by this methods in comparison with theABNT-NBR14929 method, a correction factor and a regression model were established to make the adjusts. It was concluded that the more suggested sampling method for this study, considering the acceptable error, was the ACE. And if a correction factor or a regression model is used, the moisture content determination methods of the wood are appropriated for determining the moisture content in roundwood in a fast, efficient and less costly way way than the ABNT-NBR14929 method.