http://repositorio.ufc.br/handle/riufc/104 2026-07-27T03:13:51Z 2026-07-27T03:13:51Z Castro Filho, Acrisio Feitosa de Oliveira http://repositorio.ufc.br/handle/riufc/87255 2026-07-24T17:58:08Z 2018-01-01T00:00:00Z

Título: Utilização de espectrorradiometria na quantificação de metais pesados no solo da jazida de Itataia, Santa Quitéria-CE Autor(es): Castro Filho, Acrisio Feitosa de Oliveira Abstract: Contamination of soils by heavy metals causes great harm to the environment. Thus, techniques that can measure the content of metals in the soil quickly and efficiently produce great benefits to society. The Itataia deposit fits within this context of soil pollution by heavy metals. Being the largest uranium reserve in Brazil, it has great potential for pollution, making it necessary to continuously monitor the soil of the deposit. However, these analyzes are costly and have negative environmental impacts. In view of this problem, remote sensing appears as a viable alternative for the characterization of the soil and for the quantification of the elements present in it. Therefore, the hypothesis tested will be: From the electromagnetic energy reflected by the soil, it is possible to estimate the heavy metals, since each metal presents differentiating attributes, when they interact with the incident energy. The objective of this research is to elaborate and evaluate predictive models of heavy metal quantification (Cr, Mn, Mo, Pb, Ti, Zn) in the soil using hyperspectral remote sensing. In order to test the hypothesis, 100 soil samples of 50 points were collected, being collected at depths of 0-10 and 10-20 cm. After the soil was collected, air dry thin earth was used for the chemical analyzes in order to quantify the heavy metals present in the samples. The electromagnetic spectrum of each sample was obtained by the FieldSpec Spectroradiometer 350-2500 nm, with a spectral resolution of 1 nm. After this step, three different types of preprocessing (Savitzky-Golay filtering with first and second derivatives and OSC filtering) were performed on the data and the linear regression model of the Partial Least Squares (PLSR) was tested. The models were evaluated using statistical parameters such as the coefficient of determination (r²), root mean square error (RMSE) and percentage deviation ratio (RPD). The best results were obtained with the OSC filter and Savitzky-Golay with the first derivative, where RPD values were higher than 3, indicating an excellent prediction model. The study showed that the use of remote sensing has a good application potential for the prediction of heavy metals in the soil. Tipo: Dissertação

2018-01-01T00:00:00Z Silva, Elane Bezerra da http://repositorio.ufc.br/handle/riufc/87153 2026-07-16T14:22:56Z 2026-01-01T00:00:00Z

Título: Microbioma associado a plantas de carnaúba (Copernicia prunifera): ecologia e aplicações biotecnológicas Autor(es): Silva, Elane Bezerra da Abstract: Carnauba (Copernicia prunifera ), an endemic palm tree of the Brazilian semi arid region, holds high ecological, social, and economic relevance, being widely exploited for wax extraction. Despite its importance, studies addressing soil microbial functioning and the functional potential of the microbiome associate d with this palm tree are still limited, especially under different management conditions and water regimes. In this context, this study aimed to investigate how leaf extraction management and variation in the soil water regime influence soil enzymatic act ivity, bacterial community structure, and the functional potential of microorganisms associated with carnauba. Initially, a bibliometric analysis performed on the Web of Science database (2007 2022; 658 publications) revealed a significant growth in public ations starting from 2014, peaking between 2019 and 2021, mostly focused on the properties and industrial applications of carnauba wax. The study confirmed that research integrating this palm tree into soil sciences is still incipient, validating the need for the experimental investigations conducted in this work. The study was carried out in natural occurrence areas of carnauba in the semi arid region of Ceará, in the municipality of Caucaia, selected based on the combination of two main factors: the presence or absence of leaf extraction management and different soil water regimes (flooded and unflooded). The evaluation of enzymatic activity and stoichiometric relationships showed that the water regime exerts strong control over soil dynamics, reducing total organic carbon, microbial biomass carbon, and the activities of ꞵ glucosidase, arylsulfatase, and acid phosphatase in flooded areas, while urease activity was favored by water saturation. Extractivist management acted as a mitigating factor for these va riations, reducing the variability of enzymatic stoichiometry (C:P ratio) and promoting greater functional stability, although the input of residual biomass intensified microbial phosphorus limitation in managed areas. At the molecular level, 16S rRNA gene amplicon sequencing revealed that management and water regime act as interdependent environmental filters, explaining 43.1% of the total variation in the bacterial community. The interaction between management and seasonal flooding promoted a significant reduction in richness (Chao1) and diversity (Shannon and Simpson), resulting in less complex co occurrence networks dominated by specialist taxa and stress tolerant groups (such as the Bacillota phylum). In contrast, unmanaged and unflooded areas sustained richer, more stable microbiomes with a higher proportion of generalist bacteria. Functional prediction (FAPROTAX) confirmed that preserved areas favor functions associated with phototrophy and nitrogen fixation, while management combined with flooding int flooding intensified anaerobic processes and sulfur cycling. Furthermore, the investigation of ensified anaerobic processes and sulfur cycling. Furthermore, the investigation of the culturable bacteriome showed that carnauba harbors bacteria with plant growththe culturable bacteriome showed that carnauba harbors bacteria with plant growth--promoting potential, especially in root and rhizospheric compartments. Functions such as bipotential, especially in root and rhizospheric compartments. Functions such as biological ological nitrogen fixation, phosphorus and potassium solubilization, and the production of indolenitrogen fixation, phosphorus and potassium solubilization, and the production of indole--33--acetic acid and exopolysaccharides were identified, with variations associated with acetic acid and exopolysaccharides were identified, with variations associated with management conditions and water availability. Integrated, the findings omanagement conditions and water availability. Integrated, the findings of this thesis indicate f this thesis indicate that leaf extraction management, when associated with natural water variations, does not that leaf extraction management, when associated with natural water variations, does not compromise the microbial functionality of carnauba lands and can contribute to the stability compromise the microbial functionality of carnauba lands and can contribute to the stability of soil ecological processes. However, seasonal floof soil ecological processes. However, seasonal flooding exerts the most pronounced oding exerts the most pronounced influence on the microbiome, acting as a critical filter that requires spatial and temporal influence on the microbiome, acting as a critical filter that requires spatial and temporal monitoring to ensure the sustainability of extractivism. In addition, the identification of monitoring to ensure the sustainability of extractivism. In addition, the identification of multifunctional native bacteria opens pmultifunctional native bacteria opens promising perspectives for the development of bioinputs romising perspectives for the development of bioinputs adapted to the edaphoclimatic conditions of the semiadapted to the edaphoclimatic conditions of the semi--arid region, establishing solid bases for arid region, establishing solid bases for future molecular validations and field trials aimed at the biotechnological valorization of future molecular validations and field trials aimed at the biotechnological valorization of carnauba ecosycarnauba ecosystems.stems. Tipo: Tese

2026-01-01T00:00:00Z Nogueira, Francisco Carlos Barboza http://repositorio.ufc.br/handle/riufc/87145 2026-07-15T18:46:09Z 1991-01-01T00:00:00Z

Título: Capacidade de uso das terras de uma "área piloto" nos municípios de Pacoti e Guaramiranga-Ceará Autor(es): Nogueira, Francisco Carlos Barboza Abstract: The soil conservation represents one of most important aspects in modern agriculture. To plan a rational land use it is necessary to classify it within the land capability classification. [...] Tipo: Dissertação

1991-01-01T00:00:00Z Meneses Júnior, José http://repositorio.ufc.br/handle/riufc/87097 2026-07-13T17:14:03Z 1991-01-01T00:00:00Z

Título: Efeito da adubação com NPK no crescimento e produção do cajueiro anão precoce (Anacardium occidentale L.) Autor(es): Meneses Júnior, José Tipo: Dissertação

1991-01-01T00:00:00Z