Navegando por Orientadores "VILHENA, Karyme do Socorro de Souza"

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Acesso aberto (Open Access)
Análise comparativa entre uso e qualidade do solo na área do reservatório da UHE – Tucuruí com base nos atributos físicos e químicos
(Universidade Federal do Pará, 2018-12-21) RAMOS, Jaqueline Pinheiro; VILHENA, Karyme do Socorro de Souza; http://lattes.cnpq.br/3071495983880548
The construction of dams and their reservoirs generates a series of problems, among them, it is mentioned the erosions in the banks of the reservoirs. The soils forming the UHE-Tucuruí region are subject to different uses and occupations that over time have undergone changes with the seasonality of the lake and the increasing use of land, without considering the potentials and limitations of the soil. Some of these areas already show signs of degradation and erosion occurrence points are also identified. The present work seeks to determine the chemical and physical attributes for the evaluation of erodibility in soils located in the reservoir area of Tucuruí Hydroelectric Power Plant. With the selection of native forest, planting and pasture areas, the collected and deformed samples were collected to perform the chemical and physical tests at the Civil Engineering Laboratory of the Federal University of Pará at the Campus Universitário de Tucuruí. After obtaining the results of the physical and chemical properties of the soils can be prescribed the changes caused by the difference of their use and occupation, in the comparative between the areas, the established parameters showed the chemical degradation of the soil and the loss of nutrients that trigger the erosive processes. Multivariate analysis techniques were applied: Principal Component Analysis (PCA) and Hierarchical Grouping Analysis (HCA) to correlate the variables, the understanding of the data set was facilitated and the interrelation between the variables and samples became clearer, From these analyzes, it was possible to determine that the pasture area in the superficial layer is the one that most differs from the others, when considering all the attributes analyzed and the extracted samples, in addition, the multivariate analysis highlighted the information set, which variables are undergoing changes as a consequence of anthropic activity.
Acesso aberto (Open Access)
Análise temporal dos impactos socioambientais das barragens de rejeito na bacia hidrográfica do rio Murucupi, Barcarena – PA
(Universidade Federal do Pará, 2018) SANTOS, André Thiago Lemos Miranda dos; VILHENA, Karyme do Socorro de Souza; http://lattes.cnpq.br/3071495983880548
The objective of this study is to carry out a survey of the socio-environmental influence of the users of the Murucupi River Basin, focusing on the buses of the company that uses the basin, located in the municipality of Barcarena in the State of Pará, Brazil. taking into account the multiple uses of soil and water.. The research considers multiples land uses, as well as the impacts caused by the tailings pond. For this assessment, Temporary Geographic Information Systems (TGIS) maps were applied using for the period of 1986 to 2017 data from USGS mapping and for the period of 2004 to 2014 data from TerraClass project mapping. Through this database, the impacts arising from the multiple uses of natural resources and socioenvironmental degradation observed in Barcarena were measured. Changes in land use were obtained through the State Department of Environment and Sustainability-SEMAS and IBGE data. The technical-scientific data were correlated to the socioenvironmental degradation maps in order to determine the socioenvironmental pressure caused by the installation the Imerys’ tailings pond in the study area. In addition to exposing the negative perception of the population in relation to the dam companies, through the application of online forms.
Acesso aberto (Open Access)
Caracterização dos atributos físicos e químicos de solos em áreas ex situ e in situ da ilha de germoplasma, uma reserva ambiental em Tucuruí, Pará
(Universidade Federal do Pará, 2020-03-09) NERI, Pablo Paulo Souza; VILHENA, Karyme do Socorro de Souza; http://lattes.cnpq.br/3071495983880548; https://orcid.org/0000-0001-9661-6683
The construction of hydroelectric power plants in the world is based on increasing demand for energy and river flood control. At the national level they are alternatives due to the great Brazilian hydroelectric potential. The Tucuruí Hydro-Power Complex is located in the Tocantins-Araguaia Basin and over 1,100 islands have been formed from the filling of the reservoir, inhabited by some 6,500 people, most of whom have vegetable extraction and animal husbandry as their source of income. Among these islands, one can highlight the Germoplasma Island, which is a permanent preservation area (APP) and is located 3 km from the Tucuruí dam. This island was created in order to guarantee the conservation of the plant genetic material of the region flooded by the dam. On the island of germplasm, some forest matrices planted on the courts are perishing. In other courts the productivity of the forest species is decreasing. This problem can hinder the extraction of seeds for seedling production and propagation. The purpose of this research was to determine the physical and chemical attributes of the soil and characterize the area in situ (PC3), shade planting (Q18) and full sun planting (Q17) ex situ area of the germplasm island located in the lake of the Tucuruí hydroelectric power station. Deformed composite samples were collected from 10 to 30 sub-samples in each area at depths of 0-10cm and 10-20cm. The samples were then prepared and analyzed in the Civil Engineering Laboratory of the Federal University of Pará at the Tucuruí University Campus. The chemical and physical results of the soils were submitted to the Tukey statistical test at 5% probability, Hierarchical Grouping Analysis (HCA) and Principal Component Analysis (PCA). The results of the soil chemical and physical analyses made it possible to understand the characteristics of the germplasm island areas. The highest levels of calcium and magnesium were found in Q17, due to the management performed in the plantation. Moreover, it presents high weathering and low organic matter content, and therefore, low Cation Exchange Capacity. In relation to the Q17 and Q18 planting areas, the shading planting provides the best conditions for the development of plant species and maintenance of soil quality, as it showed similarity between the chemical attributes of the natural vegetation area. From the data obtained and statistical analysis, there was greater similarity between the areas PC3 and Q18. Through the results of the Principal Component Analysis (PCA) it was possible to visualize the contribution of soil chemical attributes in the characterization of the studied areas. The soil chemical attributes that contributed the most were: ∆pH (-0.333), Al3+ (-0.332) and pH H2O (0.323), H+ (-0.534), Fe2+ (0.410) and AP (-0.379). Hierarchical Component Analysis (HCA) confirmed the results obtained in Principal Component Analysis (PCA).
Acesso aberto (Open Access)
Perfil fitoquímico, atividade antioxidante e antimicrobiana de extratos de espécies da flora amazônica coletadas na região de influência socioambiental da UHE-Tucuruí
(Universidade Federal do Pará, 2019-12-16) NOGUEIRA, Bruno Alves; VILHENA, Karyme do Socorro de Souza; http://lattes.cnpq.br/3071495983880548; https://orcid.org/0000-0001-9661-6683
With over 56,000 plant species, Brazil has one of the richest in the world, encompassing nearly 19% of the world's flora, excluding fungi. Much of this resource is found in the Amazon, which is a region with the highest biodiversity on the planet. However, due to various anthropic actions, knowledge, conservation and numerous native species with biotechnological potential can be lost. In this sense, the present study aimed to analyze the phytochemical profile, antioxidant and antimicrobial activity of peel extracts and fruit seeds of three species of the Amazonian flora, prepared from different extractive techniques. For this, vegetable matrices were obtained from the peel and seeds of fruits of Poraqueiba sericea, Garcinia macrophylla and Platonia insignis, the extraction methods applied were hot, using Sohxlet, and cold using hexane, methanol and hydroalcoholic system. (50:50) as solvents. Phytochemical screening tests were performed to identify the main classes of secondary metabolites present in plant structures. Antioxidant activity was evaluated by applying the DPPH, ABTS and FRAP methods and the antimicrobial potential was determined by the plate diffusion disc method. The hot hydroalcoholic extract of G. macrophylla seeds presented the best yield (11.40%). All species presented a considerable range of secondary metabolite classes, with emphasis on the cold hydroalcoholic extract of G. macrophylla (EHA-Gm) seeds, which presented the highest variability (9 classes). Regarding antioxidant activity, the EHA-Gm fraction showed activity of 685.53 (± 7.38x10-4 ) μmol Fe (II) .g-1 extract, in the concentration of 0.1875 mg.mL-1 , being the most active among the extracts tested by the FRAP method. This same fraction presented the lowest efficiency concentration to reduce the DPPH radical by 50% (EC50) (97.31 ± 5.98 × 10-2 µg / mL). In the antimicrobial assays, the tested extracts showed positive inhibition response against strains of Bacillus subtilis, Candida glabrata and Cyanobacteria Synechocystis sp. and Synechococus sp. The present study demonstrated that P. sericea, P. insignis and G. macrophylla species can be considered as promising sources of bioactive compounds. Notably G. macrophylla, which stood out in the antimicrobial and antioxidant tests performed during this study.