Pimenta, Alexandre SantosSilva, Juliana Soares da2017-05-302017-05-302017-02-16SILVA, Juliana Soares da. Crescimento e distribuição de raízes finas de Acacia mangium Willd e Mimosa caesalpiniifolia Benth. submetida a dois sistemas de manejo de solo. 2017. 53f. Dissertação (Mestrado em Ciências Florestais) - Universidade Federal do Rio Grande do Norte, Universidade Federal do Rio Grande do Norte, Natal, 2017.https://repositorio.ufrn.br/jspui/handle/123456789/23231The Caatinga biome has been explored in an accelerated way in the last years especially due to the native wood consumption for domestic and industrial purposes. Knowledge regarding the exportation and cycling of nutrients, morphology and chemistry of organic horizons, stand relationships with the environment, biomass production both above and below the soil is necessary in order to understand the species behavior and its interrelationships with the other natural elements. Thus, knowing the root system, especially the behavior of the fine roots in different conditions, is important to understand the physiological behavior of the aerial part, mainly with respect to mineral nutrition and the hydric balance of the tree. Acacia mangium and Mimosa caesalpiniifolia Bent. are species which develop well on poor soils, have rapid growing and are widely used in the recovery of degraded areas. Under this perspective, this study aimed to verify the growth and distribution of fine roots of acacia (Acacia mangium) and sabiá (Mimosa caesalpiniifolia Bent.), subjected to two soil management systems. The experimental design used randomized blocks with two soil management systems (A= less intensive and B= more intensive) and four replications considering three positions (L-line, E-interlining and D-diagonal) and three depths (0-20, 20-40, 40-60). In both treatments and in both species the highest density of fine roots was found in the superficial layer of the soil (0 to 20 cm), tending to reduce with depth at 12 months of acacia and sabiá and at 48 months of acacia age. The addition of bovine manure, triple superphosphate, limestone and the implementation of the furrows favored the production and vertical distribution of fine roots for the first 12 months of age in both species. At 48 months of acacia age, root growth was similar in the two cultivation methods, both the more and the less intensive ones, and the sabiá did not respond positively to the more intensive soil management system.Acesso AbertoAcaciaSabiáRaízes finasSilviculturamasterThesisCNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL