Estimativa volumétrica de plantios de eucalipto vinculados à reposição florestal no Estado da Bahia

Abstract

Forest Replacement is a legal obligation that must ensure that all consumption of native vegetation resulting from the suppression of vegetation is compensated through forest plantations, generating a stock of raw material. The Institute of Environment and Water Resources of Bahia - INEMA is the autarchy responsible for controlling this mechanism through the recognition, issuance, and transfer of forest volume credits, which compensate for the debit generated by the consumption of deforested native vegetation. This work aimed to analyze forest plantations with Eucalyptus spp. in Bahia, relating the productivity of these stands to climatic and silvicultural characteristics and guiding INEMA technicians in the analysis of volumetric estimates, reducing errors and facilitating their work. The correlation between average annual precipitation and Average Annual Increment - IMA in volume was significant in the t-test at 95% probability. The models were adjusted with all data (general), as well as stratified by region, initial planting spacing, genetic material, and annual precipitation class. The general equation obtained should be used for regions that do not have specific equations. The Agreste de Alagoinhas, Litoral Norte, Camaçari, and Extremo Sul regions have the highest productivity indices. The West Bahian and Rio Corrente Basin regions had the lowest productivity indices, high mortality, with low potential for forest replacement. The Vitória da Conquista region has good potential for replacement but should not have its credits recognized in full until the forest's growth can be proven. Small spacings had low productivity indices in all regions and should be avoided. The combinations of strata that could be made with the available data were: Extremo Sul region and annual mean precipitation class between 1201 and 1500 mm, Vitória da Conquista region and annual mean precipitation class <900 mm, Rio Corrente Basin and West Bahia region and annual mean precipitation class between 900 and 1200 mm, and Extremo Sul region and initial planting spacing 2. These equations are more accurate and should be used whenever possible. New equations will need to be generated as the database is updated.