Programa de Pós-Graduação em Biodiversidade e Conservação - PPGBC/Altamira
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/9260
Surge em 2014 diante da necessidade de formar profissionais capacitados para lidar com os aspectos ambientais, econômicos e sociais que permeiam a biodiversidade brasileira e, em especial, a da região amazônica. O PPGBC está vinculado ao Campus Universitário de Altamira, da Universidade Federal do Pará (UFPA), suprindo uma importante demanda do ensino superior na região Transamazônica e Xingu.
Área de conhecimento: Ciências Biológicas (Ecologia, Zoologia, Fisiologia, Morfologia, Genética, Botânica, Sistemática, Taxonomia, Filogenia, Microbiologia), as Ciências Exatas e Naturais (Geologia, Matemática e Estatística), e às Ciências Sociais Aplicadas (Economia e Sociologia).
Navegar
Navegando Programa de Pós-Graduação em Biodiversidade e Conservação - PPGBC/Altamira por Orientadores "LEÃO, Fábio Miranda"
Agora exibindo 1 - 2 de 2
- Resultados por página
- Opções de Ordenação
Item Acesso aberto (Open Access) Enxertia e indução da floração com Paclobutrazol em golosa (Chrysom sapyllunuignolentum (Pierre) Baehnni)(Universidade Federal do Pará, 2025-02-24) RIBEIRO, Cleber da Silva; LEÃO, Fábio Miranda; http://lattes.cnpq.br/6256044082655658; https://orcid.org/0000-0002-3258-8748Accelerating the flowering and fruiting of species in degraded areas can make forest restoration more efficient. Grafting combined with plant growth regulators has the potential to enhance this process. This study evaluated the effectiveness of grafting and different graft protection techniques on the grafting success rate of Golosa seedlings (Chrysophyllum sanguinolentum) and the impact of paclobutrazol on grafted and non-grafted seedlings under different shading conditions. The experiment was conducted at the Federal University of Pará in two phases. The first phase, carried out between August and September 2023, involved grafting 160 seedlings distributed across four graft protection treatments: parafilm (T1), parafilm with kraft paper bag (T2), plastic bag (T3), and plastic bag with kraft paper bag (T4). A completely randomized block design was used, and the seedlings were kept in a greenhouse. Budding was evaluated at 20, 27, 34, 41, 48, and 56 days after grafting. Since normality and homogeneity assumptions were not met, the non-parametric Kruskal-Wallis test (p < 0.05) was applied. The second phase, conducted between June and December 2024, evaluated stem diameter, height, number of leaves, and chlorophyll index, considering grafting, shading, and paclobutrazol application as factors. A completely randomized design was used, with 56 seedlings divided into grafted (28) and non-grafted (28) groups, subjected to two shading levels (full sun and 50% shade) and two paclobutrazol treatments: application of 2 ml diluted in 250 ml of water and a control without application. Measurements were taken at 0, 30, 60, 90, 120, 150, and 180 days after PBZ application. Data analysis was performed using R Studio software, applying Generalized Linear Models (GLM). The results showed significant differences between graft protection treatments. T2 (parafilm with kraft paper bag) had the highest grafting success rate (27.5%), followed by T4 (12.5%), while T1 had 10%, and T3 showed no budding. Regarding shading, plants under 50% shade exhibited greater stem diameter growth (2.36%), a higher number of leaves (53), and a higher chlorophyll index (34.2 g). Height growth was also greater under shade but was not statistically significant. Non-grafted plants had a higher number of leaves (64), while grafted plants had the highest chlorophyll index (30.7 g). PBZ reduced the average number of leaves (42) and stem diameter growth (1.99%) but did not significantly affect height or the chlorophyll index. It is concluded that grafting is an effective asexual reproduction technique for C. sanguinolentum, and graft protection with parafilm and a kraft paper bag improves grafting success. Additionally, grafting may accelerate flowering and fruiting, but this hypothesis requires long-term monitoring. PBZ proved to be phytotoxic, reducing growth and causing total leaf loss.Item Acesso aberto (Open Access) Indicadores de qualidade do solo e sistema de plantio adensado em área degradada na Amazônia(Universidade Federal do Pará, 2024-09-30) SILVA, Kerciane Pedro da; SANTOS JUNIOR, Jaime Barros dos; http://lattes.cnpq.br/8994389767647854; HTTPS://ORCID.ORG/0000-0002-2933-8764; LEÃO, Fábio Miranda; http://lattes.cnpq.br/6256044082655658; https://orcid.org/0000-0002-3258-8748Soil degradation results in the loss of organic matter and compaction, making the assessment of soil health through quality indicators essential for monitoring and adapting management practices in degraded areas. Furthermore, seeking new planting strategies for forest restoration is important so that areas that have suffered some type of degradation can be restored. In this context, the objectives of this study were: 1. To compare soil quality in forest areas and different topographies of a pasture area. 2. To analyze the survival and growth of tree species. 3. To evaluate the effect of grafting on C. sanguinolentum planted in spaced groups. The research was conducted at the Environmental Studies Center (CEA), located in the municipality of Vitória do Xingu, PA, in the Volta Grande do Xingu region. Soil samples were collected from the forest area and at three different altitude ranges (120-130 m, 130-140 m, and 140-150 m) in the degraded area to determine physical and chemical attributes, in addition to calculating the Soil Structural Quality Index (IQES). The dense planting technique consisted of the distribution of 30 groups located on three different topographies (120, 130, and 140 m). Each group was composed of 13 seedlings of forest species representing different successional stages, with the climax species C. sanguinolentum positioned in the center. In each altitude range, five grafted and five non-grafted individuals of C. sanguinolentum were planted in the center of the groups, and monitored over a six-month period. The soil analysis identified significant differences in physical and chemical parameters between forest areas and pasture areas, highlighting the impact of management practices in degraded areas. The forest areas exhibited better physical soil quality compared to the degraded areas. In the forest, there were higher concentrations of organic carbon, available phosphorus, and potassium, as well as a more acidic pH due to the accumulation of organic matter. On the other hand, the degraded altitude ranges showed a tendency toward soil compaction. In the dense planting, the mortality rate was 7.69%, with the species S. mombin and G. americana showing no mortality. S. mombin had the highest growth in height (75.87%) and diameter (168.25%). The species C. sanguinolentum showed better performance in diameter among the non-grafted seedlings, with mortality occurring only in the grafted seedlings. Seedling growth was influenced by altitude, with better diameter and height development of the studied species in the lower altitude area. The soil analysis results demonstrated that native vegetation contributes to the improvement of soil quality and maintains positive ecological processes, while inappropriate practices harm the soil's ecological functionality. Dense planting, in general, proved to be an effective strategy for ecological restoration, thus promoting ecosystem functionality and contributing to the advancement of ecological succession in degraded areas.