Ganade, Gislene Maria da SilvaNascimento, Fernanda Vitória Silva do2023-02-032023-02-032022-08-30NASCIMENTO, Fernanda Vitória Silva do. Influência das características do solo no desempenho de espécies nativas em programa de restauração da Caatinga. Orientador: Gislene Maria da Silva Ganade. 2022. 53f. Dissertação (Mestrado em Ecologia) - Centro de Biociências, Universidade Federal do Rio Grande do Norte, Natal, 2022.https://repositorio.ufrn.br/handle/123456789/51189The Caatinga is characterized by a semi-arid climate, high temperatures, high evaporation rates and geological conditions that favor greater soil fertility and rapid plant growth in the rainy season, but also a greater accumulation of salts in the soil, which can impair plant development. Additionally, the constant anthropic actions of improper land use have contributed to the increase of deforestation and desertification in the region, which leads to a great need for restoration of degraded areas of the Caatinga. To increase the efficiency of restoration in degraded areas, studies of plant responses to both soil fertility and salinity are necessary. This study was conducted in a restored area of Caatinga and aims to: 1) Characterize the levels of salinity and fertility of the soil in this restored area; 2) Test how salinity and fertility contribute to the success of restored communities, in terms of survival; 3) Test how different compositions of restored communities could influence soil parameters after 5 years of restoration. The study was conducted at FLONA de Açu-RN, in an experiment established 2016 in a degraded Caatinga area. The site was divided into 155 plots, where native seedlings were planted with five different levels of richness (1, 2, 4, 8 and 16). The work was carried out in all monocultures and in the plots where all tree species were planted together (16 species). In these plots soil samples were collected and analysed for fertility and salinity parameters that were calculated according to the Embrapa methods manual. To test whether soil salinity and fertility characteristics (explanatory variables X) influence the survival of tree communities (response variable Y), we used Mixed Models in R software, observing how the continuous parameters of salinity, fertility and the two levels of vegetation diversity (1 and 16 species) affect the survival of planted tree species. To test whether the species composition of monoculture and polyculture (explanatory variable X) has any effect on soil parameters (response variables Y) a MANOVA was performed using the soil parameters that were not previously correlated. The results showed that the soils are not saline, with 10 of 63 plots showing fertile soils. For salinityrelated parameters, increasing Electrical Conductivity reduced the survival of the species in mono and polycultures, whereas high potassium (K) availability generated higher survival rates in the plots. For fertility parameters, high availability of potassium (K) was also observed in higher survival plots, while high availability of Organic Matter generated lower survivals. In relation to the plant communities (mono and polycultures) influencing soil nutrient composition, no significant differences were found for both the salinity and fertility parameters in these first 5 years of restoration, demonstrating that the tree species, in this space of time, are not yet able to alter the quality of the soil.Acesso AbertoFertilidade do soloSalinidadeCaatingaRestauraçãoÁrvores nativasmasterThesisCNPQ::CIENCIAS BIOLOGICAS::ECOLOGIA