Uso de banda dendrométrica na definição de padrões de crescimento individual em diâmetro de árvores da bacia do rio Cuieiras

Abstract

This study dealt with the analysis of individual growth pattern for about 300 trees distributed over two transects (East-West and North-South) measuring 20 by 2500 m, which were stratified by plateau, slope and "baixio", and three diameter at breast height (dbh) classes (10≤dbh<30 cm; 30≤dbh<50 cm e dbh≥50 cm). In each tree a metal "dendrometer" band was fixed to the trunk and growth in circumference was measured with a digital caliper. Measurements were carried out for 19 months, from June/1999 to December/2000; for this study only 12 months of year 2000 were considered. Individual growth pattern varied significantly over time (p = 0,00), and slightly (p = 0,08) when the interaction months and dbh classes was included; on the other hand, the signal is very weak (p = 0,25) when topographical classes were added to the later interaction, and no signal at all (p = 0,89) when the interaction between months and topographical classes were analyzed. Mean annual increment in diameter considering all 272 monitored trees was 1,64 ± 0,21 mm yr-1 (p = 0,05), falling within the interval estimated for BIONTE and Tapajós National Forest which are 1,5 and 2 mm per year, respectively.