Engenharia Florestal (Sede)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/15
Siglas das Coleções:
APP - Artigo Publicado em Periódico
TAE - Trabalho Apresentado em Evento
TCC - Trabalho de Conclusão de Curso
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Resultados da Pesquisa
Item Estoque de carbono e fertilidade de tecnossolos originados de rejeitos da mineração de scheelita no semiárido brasileiro(2024-02-21) Nunes, Gustavo Vieira; Silva, Ygor Jacques Agra Bezerra da; http://lattes.cnpq.br/0904824873761236; http://lattes.cnpq.br/0011472973408477Studying technosols is essential to understand their potential for agricultural production, reclaim degraded areas, and sequester carbon. In the semi-arid region of Northeast Brazil, the largest scheelite mine in South America is located, and waste from this activity has been accumulating since the 1940s, impacting environmental quality. Although technosols originating from mining waste are studied globally, information on the fertility and organic carbon stock of these soils is scarce in Brazil, especially in semi-arid regions. Therefore, this study aims to assess the carbon stock and fertility of technosols constructed 40 years ago from scheelite mining waste in the Brazilian semi-arid, with the purpose of evaluating their potential for agricultural use and carbon sequestration. Forty composite samples were collected from the surface horizons (0-30 cm) of technosols constructed from waste at the Brejuí Mine, located in the municipality of Currais Novos, in the semi-arid region of the state of Rio Grande do Norte. The average soil density was 1.38 kg dm-3, potentially not negatively impacting the physico-hydraulic properties of the technosols. The average pH in water and KCl was 8.53 and 8.07, respectively, with a mean ΔpH of -0.47. The alkalinity in technosols, due to carbonates in tactites and marbles (materials forming the waste), may restrict plant growth by causing nutritional imbalances and micronutrient deficiencies. The average available concentrations of P (2.73 mg kg-1) and K (0.14 cmolc kg-1) are limitations for agricultural activity, requiring strategies to increase these nutrients to improve agricultural viability. The average organic carbon concentration in technosols was 24.11 g kg⁻¹, more than double the average observed in Caatinga soils, which is typically around 9.3 g kg⁻¹. The technosols derived from scheelite mining achieved carbon stocks of up to 222.93 Mg ha-1, surpassing Vertisols (60.08 Mg ha-1) by over three times and more than doubling the national average (99.39 Mg ha-1), highlighting their potential for carbon sequestration in the semi-arid region. This study, given the scarcity of information on technosols derived from mining in Brazilian semi-arid environments, contributes not only to the scientific community but also to policy-makers, emphasizing the importance of efficient mining waste management in the recovery of degraded areas, sustainable agricultural production, and carbon sequestration, crucial for mitigating climate change.Item Diversidade de invertebrados do solo em sistema agroflorestal e diferentes ambientes sucessionais em floresta ombrófila densa(2024-02-16) Souza, João Matheus Ferreira de; Gonçalves, Maria da Penha Moreira; Almeida, Débora de Melo; http://lattes.cnpq.br/9795066247076929; http://lattes.cnpq.br/0539509819672370; http://lattes.cnpq.br/7784879810259175Studies on soil fertility and soil fauna diversity in agroforestry systems are of fundamental importance to prove the efficiency of these sustainable production models associated with the recovery of degraded areas. This work aims to evaluate correlations between soil fauna diversity and soil fertility in an agroforestry system and areas of native forest at initial and intermediate stages of forest succession. The study was conducted in the campus area of the Federal Rural University of Pernambuco, located in the Metropolitan Region of Recife, Pernambuco. Three sites with different land use histories were used: an area at an intermediate stage of forest succession (A1), a 3-year-old agroforestry system (A2), and an area at an initial stage of forest succession (A3). Pitfall traps were used to capture the soil invertebrate community. The captured organisms were identified, classified into taxa, and subsequently sent for analysis. Soil collection covered the 0-20 cm and 20-40 cm layers in each study area. The samples underwent chemical analysis. Data on soil meso- and macrofauna were used to calculate abundance, relative frequency, richness, Pielou's evenness indices, Shannon's diversity, and Simpson's diversity. Hill's true diversity components (qD) were estimated for each environment. Data analysis also included exploratory analysis with NMDS, permutational multivariate analysis of variance (PERMANOVA), Pearson correlation matrix, agglomerative hierarchical clustering analysis (HAC), principal component analysis (PCA), and Canonical Correlation Analysis (CCA). A total of 2,232 individuals distributed in 18 taxonomic groups were identified. Overall, regardless of land use, the most representative groups were Hymenoptera: Formicidae (37.46%), Acarina (21.10%), Collembola (15.86%), and Diptera (9.68%). Together, these groups represented 84% of the individuals collected in this study. The agroforestry area showed greater richness, the area of initial forest succession showed greater abundance in groups, and the area at an intermediate stage of succession showed greater diversity. Although the agroforestry area had greater richness, the estimated diversity was lower compared to the area of initial forest succession. Soil chemical analysis showed differences between the areas, influencing fauna distribution. Similarity in fauna composition was observed between the agroforestry area and the initial forest succession, highlighting the influence of soil chemical attributes on soil fauna. It is concluded that the study of soil fauna has the potential to be used as an indicator of soil quality, as it is sensitive to environmental interference.Item Teores foliares de nitrogênio, fósforo e potássio de espécies florestais tratadas com biocarvão e adubos orgânicos no semiárido pernambucano(2018) Carvalho, Isadora Barros Moura de; Silva, José Antônio Aleixo da; Freire, Fernando José; http://lattes.cnpq.br/8371992516325399; http://lattes.cnpq.br/5674098794412714; http://lattes.cnpq.br/1883959486411942The objective of this work was to analyze N, P and K contents in the leaf material of an angico and eucalyptus' plantation submitted to different sources of fertilization. In order to do that, twenty five leaves of the trees crowns’s middle third were collected from the plot’s useful area. The collected material was packed in paper bags and taken into a forced ventilation oven at 65 ± 5º C until constant weight was obtained; posterior to that, the material was ground in a Wiley mill, passed through 1.0 mm steel screen and stored for analysis of N, P, K content. The angico was the species that presented the highest concentration of nutrients. Regarding the phosphorus, the fertilization treatment with fish farming residue presented higher levels in the angico, while for the eucalyptus higher levels were observed in the fertilization treatment with lake sediment. Regarding potassium the most expressive values were found in the fertilization treatments with fish farming residue and lake sediments for both species, which did not statistically differ from the control. However, significant differences were observed between the biochar and the other treatments for the eucalyptus. The highest levels of nitrogen were observed in the Angico and there was no significant difference among the treatments. Although the soil was rich in nutrients, it was observed that the sources of fertilization and managed species type interfered in the contents of some elements. The presence of nutrients in the soil is not a guarantee of assimilation by the plants, since many factors can influence the absorption of nutrients by the vegetable. It was concluded that fish farming residue and lake sediments, because of good concentrations of N and P, are alternatives to be used as fertilizers in planted forests.