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Dinamica da distribui o diamétrica de povoamentos de Pinus taeda, na regi o de Ca ador, SC Dynamics of the diameter distribution of Pinus taeda stands, in the region of Ca ador, SC, Brazil

DOI: 10.4336/2012.pfb.67.183

Keywords: Estrutura horizontal , Fun o de densidade probabilística , Teste de aderência de Kolmogorov-Smirnov

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Abstract:

O objetivo deste trabalho foi ajustar as fun es de densidade probabilísticas (fdp’s) Normal e SB de Johnson, para descrever as mudan as, com a idade, na estrutura diamétrica de povoamentos de Pinus taeda L., na regi o de Ca ador, SC. Os dados utilizados foram provenientes de parcelas temporárias e permanentes, com idades variando de 5 a 11,9 anos, agrupadas em classes com intervalos de 1 ano. Foram ajustadas as fdp’s e obtidas as estimativas dos parametros de assimetria e curtose. Por meio do teste de Kolmogorov-Smirnov, verificou-se que, para as idades de 5 a 7,9 anos, as fdp’s Normal e SB de Johnson n o apresentaram aderência satisfatória. As fdp’s SB de Johnson e Normal apresentaram melhor aderência para as idades de 8 a 9,9 e 10 a 11,9 anos, respectivamente. Utilizando a fdp Normal para analisar a dinamica da distribui o diamétrica, verificou-se um deslocamento das curvas de distribui o diamétrica para a direita, um “achatamento” e um “alargamento” destas curvas ao longo dos anos. A assimetria foi negativa para todas as idades, exceto para as idades de 8 a 8,9 anos. A curtose foi leptocúrtica para todas as idades, e platicúrtica para as idades de 8 a 8,9 anos. doi: 10.4336/2011.pfb.31.67.183 The objective of this work was to fit the probability density functions Normal and SB, to describe the changes, with age, in the diameter distribution of loblolly pine (Pinus taeda) stands, in the region of Ca ador, Santa Catarina State, Brazil. The data came from permanent and temporary plots, with ages ranging from 5 to 11,9, grouped in age classes with intervals of 1 year. The probability density functions were fitted and, the Kolmogorov-Smirnov test and the parameters of skewness and kurtosis were calculated. Basing on Kolmogorov-Smirnov test it was verified that, for ages from 5 to 7.9 years old, the Normal and SB functions didn’t show satisfactory adherence. The SB and Normal functions showed better adherence to the ages from 8 to 9.9 and from 10 to 11.9 years old, respectively. Using the Normal probability density functions to analyze the dynamics of the diameter distribution, it was found that there was a shift of the diameter distribution curves to the right, a “flatness” and an “wideness” of these curves, over the years. The skewness was negative for all ages, except for the age from 8 to 8.9 years old. The kurtosis was leptokurtic for all ages, except for age from 8 to 8.9 years old, which was platykurtic. doi: 10.4336/2011.pfb.31.67.183

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