Determinação indireta do estoque de biomassa e carbono em povoamentos de acácia-negra (Acacia mearnsii de Wild.)

Abstract

This work was carried out to estimate the carbon storage in even-aged stands of Acacia mearnsii De Wild., in the region of the Southeast Lower Hillside, in Rio Grande do Sul, by the method of derivation of volume and carbon. The biomass components and carbon content were measured in stands 4 to 8-year-old. The method of derivation of volume and carbon was efficient to determine the carbon storage, since the average relative difference was only 4.4%, when considering the whole sample, and independent from stands age. The mean wood basic density found was 0.6 g/cm3, regardless of stand age. The mean biomass ratio of the barked-volume to the volume of leaves, branches, litter, and roots was found to be 0.59, independent of stand age. The mean carbon concentration, regardless stand age, was 0.40. The estimated carbon storage by the method of volume and carbon derivation, for 7-year-old stands, was 99.46 t ha-1, in site index 20; 82.89 t ha-1, in site index 16; and 46.13 t ha-1, in site index 12.