O crescimento da Nectandra megapotamica Mez., em floresta nativa na depressão central do Estado do Rio Grande do Sul

Abstract

Este trabalho foi realizado com o objetivo de estudar o crescimento em diâmetro, volume comercial, fator de forma comercial e incremento corrente anual do volume comercial em porcentagem (ICA%) para duas árvores dominantes de canela-preta (Nectandra megapotamica), em uma Floresta Estacional Decidual, localizada no município de Santa Maria na depressão central do Estado do Rio Grande do Sul. Os dados foram obtidos mediante análise de tronco e as tendências de crescimento em diâmetro, volume comercial, fator de forma e ICA%, foram ajustados com a utilização dos modelos de Mitscherlich & Sontag (1982), Backman (1943), Richards (1959), e um modelo parabólico do segundo grau. O ajuste dos modelos indicou que, para as variáveis diâmetro e volume comercial, o melhor modelo foi o de Mitscherlich & Sontag, para a árvore 1,sendo que, para a árvore 2, o modelo de Richards apresentou melhor ajuste. Para o incremento corrente anual do volume comercial em porcentagem, o melhor modelo foi o de Backmam, sendo o modelo parabólico, o de melhor ajuste para o fator de forma comercial.

Evaluating tree survival and modeling initial growth for Atlantic Forest restoration

“…The standard error of estimate varied between 15.23 and 30.57%. Similar results were reported for the Chapman-Richards model in our study, which ranged from 0.47 to 0.79 for the coefficient of determination, and from 24.99 to 52.80% for the standard error of the estimate TONINI et al (2003). used the Chapman-Richards model to describe the initial (nine years) growth of six Amazon Forest species, obtaining coefficient of determination values ranging from 0.63 to 0.79.…”

Seasonal influence on the essential oil production of Nectandra megapotamica (Spreng.) Mez

“…In Brazil, it can be found in the states of Rio Grande do Sul (RS), Santa Catarina (SC), Paraná (PR), São Paulo (SP), Mato Grosso do Sul (MS), Minas Gerais (MG), Rio de Janeiro (RJ), and Espirito Santo (ES) (Lorenzi 2002;Carvalho et al 2006). In RS, the species is widely distributed in native forests (Tonini et al 2003), participating in the composition of the Dense Ombrophilous Forest, Mixed Ombrophilous Forest, Seasonal Deciduous Forest and Seasonal Semideciduous Forest (Marchiori 1997). The various biological activities described to essential oil (EO) of N. megapotamica and/ or its components have aroused interest of Latin American researchers working in the area of its occurrence.…”

<i>Trema micrantha <?I>(L.) Blume. IN PLANTATIONS FOR ECOLOGICAL RESTORATION: EARLY DEVELOPMENT IN THE BRAZILIAN SUBTROPICAL FOREST

“…However, it is clear that the lower average growth values were obtained at 12 months, mainly for the variables root collar diameters and total heights. Note that reducing the rate of growth has strong relationship with the period of the lowest temperatures of the year, which certainly hampered the development of the species at this stage (KRAMER, 1986;TONINI;SCHNEIDER, 2003). Where in: dc = root collar diameter; CV (%) = coefficient of variation; ht = total height; sc = crown projection area; vc = canopy volume; N = number of individuals.…”