Pimenta, Alexandre SantosBraga, Rodolpho Stephan Santos2025-02-062025-02-062024-02-28BRAGA, Rodolpho Stephan Santos. Durabilidade natural das madeiras de Mimosa tenuiflora (Willd.) Poir. e Mimosa caesalpiniaefolia Benth. Orientador: Dr. Alexandre Santos Pimenta. 2024. 74f. Dissertação (Mestrado em Ciências Florestais) - Escola Agrícola de Jundiaí, Universidade Federal do Rio Grande do Norte, Natal, 2024.https://repositorio.ufrn.br/handle/123456789/62536Knowledge of the characteristics and durability of every wood species is essencial so it can be better directed for the correct harnessinng. In a wood rot field test, this work aimed to determine the natural durability of timber species from the Brazilian dry forest, Mimosa tenuiflora (Willd.) Poir. (jurema-preta) and Mimosa caesalpiniaefolia Benth. (sabiá). The rotting field was implemented in a Forest Experimentation Area, located in the municipality of Macaíba-RN. In this, samples were introduced in two formats: stakes with dimensions of 5.0 x 2.5 x 50.0 centimeters (radial x tangential x longitudinal), and round pieces 1 meter long and with an average diameter between 10 and 15 centimeters. Both pieces were buried in the ground up to half their length, where a randomized block design was used. Annual assessments were carried out to determine the health index and the deterioration susceptibility index. In conjunction with the analyses, the condition of the bark of the samples, the hardness of the wood in the soil and in the aerial part, the presence of longitudinal cracks in the wood, and the presence of termites and fungi were evaluated in the field. In addition, the mass loss of the specimens and the extraction and quantification of tannins from the wood were obtained. The results of 3 years of evaluation of the test make it possible to understand that both species presented as durable wood, making them highly durable naturally, where Mimosa caesalpiniaefolia presented a health index of 77.27% in lumber samples and 78.57% in round pieces, while Mimosa tenuiflora presented 66.27% and 81.43% respectively, making them of high natural durability, when compared to the health index for Eucalyptus sp. treated. The condensed tannin content found for the species under study was 4.40% for Mimosa caesalpiniaefolia and 3.99% for Mimosa tenuiflora. As it presents varied results under different analyses, it is still necessary to evaluate the species for a longer period in the rotting field.Acesso AbertoTaninosEnsaios de campoBiodeterioraçãoSemiáridomasterThesisCNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL