PADRÕES DE CRESCIMENTO E PREDIÇÃO DA ESTRUTURA DIAMÉTRICA COM AUXÍLIO DE BANDAS DENDROMÉTRICAS NA FLORESTA NACIONAL DE CAXIUANÃ - PA

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

11/07/2008

RESUMO

In forest management it is fundamental that those in charge know how to plan the logging activities grounded on statistical tools so they can diminish error margins in important decision making situations. Knowledge about informations of growth pattern and diameter distribution projection leads to optimization of the production process. It is so because those dendrometer-based techniques point to the moment of intervention on the forest with prescription of sound silvicultural activities and give more precise information about the logging cycle. This present work emphasizes both those tools aiming at assessing growth pattern and future diameter structure in two kinds of ecosystem: i) a non-flooded yellow latossol (LA, yellow oxisol) and ii) terra preta antropogênica (TPA, athropogenic dark earth) at FLONA Caxiuanã/PA. 400 trees were randomly selected from a database from project PAN-AMAZONIA in each ecosystem, by 5 diameter classes (DM) and 3 wood density classes (CDM). Growth data were gathered by fixation of dendrometer bands in all the trees within the inventary with DBH >10 cm, during a period of two years (2004-2006), recording circumference increment monthly (IMM monthly mean increment) with an analogical caliper. Growth patterns on both areas follow paralally weather seasonality, with a IMM on TPA of 6,82mm + 0,042mm (CI 95%) and on LA of 1,108 mm + 0,08mm (CI 95%). Correlation between the variables increment and precipitation was low, but positive and significant at 1% in the TPA (r = 0,25; p<0,001) and in the LA (r = 0,26; p<0,001). When precipitation historical series (1980-2000) handed by IBAMA are used the following values were found for the TPA (r=0,80; p<0,001) and LA (r=0,76; p<0,001). Discarding harsh variations that occured throughout both years diminished discrepancies with increment data. Interactions produced by the ANOVA-MR for the TPA and LA show that IMM varies considerably with time passage (G-G:<0,001), wood density did not influence IMM on either site (G-G=0,653; G-G=0,095), respectively, and diameter class influenced only LA at 5% probability (GG= 0,001). The Markov chain model projected a diameter structure on both sites for a two years interval (2004-2006 to 2008), where the diameter distribution observed and projected for the LA (x2tab (α=0,01; 9 gl) = 21,7; x2calc = 5,6) as for the TPA (x2tab (α= 0,01; 9 gl) = 21,7; x2calc = 1,9) were perfectly fitted to the model with only two years of measurement and under tropical forest conditions.

ASSUNTO(S)

dendrometria manejo florestal espécies florestais terra preta latossolos - amazônia floresta nacional de caxiuanã (pa) recursos florestais e engenharia florestal

ACESSO AO ARTIGO

Documentos Relacionados