Studies of Quantitative Relationships Among Dendrometric Variables and Carbon Contents for Native Mimosa scabrella Stands in the Curitiba Metropolitan Region

Abstract

This research aimed to determine dry weights and carbon contents by age, and by compartment of Mimosa scabrella trees, their correlations with other measured tree variables. The data for this research work came from 190 trees located in several counties of the Curitiba metropolitan region. Total height, crow height, stem height, DBH and crow diameter were measured of each one of the 190 trees. Every sample tree was felled down and sectioned in the following components: stem, thick branches (diameter ≥ 4 cm), thin branches (diameter < 4 cm), foliage, and dead branches. The green weigth of each tree component was weighted in the field. Small sub samples of each tree component were also weighted in the field and brought to the laboratory for oven dry. Thus it was obtained the dry weight of the whole component by extrapolation. Small portions of each component from 55 trees were triturated for carbon content determination. The stem dry weight participated with 69.85% of the whole tree, as an average, and presented a coefficient of variation of 17.88%. Theproduct DBH2*Total height and the DBH were the variables which presented the highest coefficient of correlation with the stem weight, as well as with the other tree components. There was no significative differences of carbon content among ages, either diameter classes for all analized components.