ABSTRACT:The objective of the present study was to describe the increase in diameter, height and volume of trees of Schizolobium amazonicum Huber ex Ducke and adjust a mathematical model to describe growth in terms of total volume in two plantations in the north of Mato Grosso, Brazil. Data were obtained through full analysis of the stem of 12 trees collected in two plantations. Four functions of volume growth according to age were tested. Growth in diameter, height and volume were compared through analysis of variance and Tukey test. The average growth for the two plantations, which had 16 years of age, in terms of DBH and total height were 30.1 and 32.2 cm; 29.2 and 23.9 m and volumetric production was 1.04 and 0.96 m 3 , respectively, for the plantations one (1) and two (2). There was a statistical difference (p <0.001) between the plantations only for the variable total height from the eighth year. The Richard's (R²aj 0.82) and Logistic (R²aj 0.65) models had the best fit for the plantations one and two, respectively. Results pointed to the conclusion that S. amazonicum has rapid growth in the study area but this is still lower than the growth of the species in other Amazon states such as Pará, Acre and Rondônia.Keywords: reforestation, stem analysis, modeling, Amazon.Crescimento e produção de madeira de paricá em dois plantios no norte de Mato Grosso RESUMO: Objetivou-se com o presente estudo, descrever o crescimento das variáveis: diâmetro, altura e volume e ajustar um modelo matemático para descrever o crescimento em volume total de árvores de Schizolobium amazonicum Huber ex Ducke, em dois plantios no Norte do estado de Mato Grosso. Os dados foram obtidos mediante análise de tronco completa de 12 árvores coletadas em dois plantios. Foram testados quatro funções de crescimento volumétrico em função da idade. Os dados de crescimento em diâmetro, altura e volume foram comparados pela análise de variância e teste de Tukey. As médias do crescimento para os dois plantios, aos 16 anos para o dap e altura total foram de 30,1 cm e 32,2 cm; 29,2 m e 23,9 m, e a produção volumétrica foi de 1,04 e 0,96 m 3 , respectivamente para os plantios um (1) e dois (2). Houve diferença estatística (p < 0,001) entre os plantios apenas para a variável altura total a partir do oitavo ano. Os melhores modelos de crescimento volumétrico foram o de Richard (R²aj 0,82) e Logistic (R²aj 0,65) para o plantio um e dois, respectivamente. Conclui-se que S. amazonicum possui rápido crescimento na região de estudo, no entanto, é inferior ao crescimento em outros estados da Amazônia como Pará, Acre e Rondônia.Palavras-chave: reflorestamento, análise de tronco, modelagem, Amazônia.Recebido em janeiro/2016; Aceito em maio/2016.
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