Factor de expansão de biomassa florestal na região do corredor da Beira

Abstract

The present study was carried out in the Beira Corridor (CB), located in the central region of Mozambique with a length of 260km, connecting the provinces of Sofala and Manica. Its objective was to contribute to the knowledge of woody biomass quantification methods in native forests. In this context, the CB is characterized by having diversified vegetation and a tropical climate, with an estimated population of around 701,227 inhabitants, in which most of them practice subsistence agriculture and a considerable number practice trade, as it is about a region with easy access to road and rail. For this purpose, land use and land cover maps were analyzed to mark the 27 temporary 20x20m plots, taking into account the accessibility of the site, thus facilitating the collection of data in the field. A total of 290 trees with DBH >5 cm of various unidentified species were measured and felled, as well as their respective weights after being plotted in easy-to-measure sizes. Afterwards, the samples were extracted to the laboratory, where they were submitted to a temperature of 85C in the oven and the processing of the data obtained. The results indicate that the wood density for CB is 0.67 Ton/ha and that the BEF for the same region is 2.03=0.15, ranging from 1.88 to 2.19. The correlation between BEF and DBH is not significant, with a low Pearson coefficient (r=0.117) and that the relationship between the proportion of weight of the branches and BEF there is evidence of a very strong correlation (r=0.919) than when the proportion of the weight of the branches increases, the BEF increases exponentially. For BC, the results indicate that about 52.98% of the tree components are constituted by branches. When comparing the biomass calculated based on the BEF and based on the regression, it was possible to notice that the biomass calculation using the BEF tends to overestimate large trees and using the regression equation tends to underestimate large trees and that there is no significant difference in using one of the methods discussed here (TRADUÇÃO NOSSA)