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Dissertations |
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SHAYANA DE SOUZA OLIVEIRA
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Population structure of Macrobrachium amazonicum in the reservoir of UHE – Caçu, Caçu, Goiás
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Advisor : FABRICIO LOPES DE CARVALHO
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COMMITTEE MEMBERS :
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BRUNO GABRIEL NUNES PRALON
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ERMINDA DA CONCEIÇÃO GUERREIRO COUTO
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FABRICIO LOPES DE CARVALHO
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MARIANA VELLOSA CAPPARELLI
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SERGIO SCHWARZ DA ROCHA
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Data: Mar 30, 2023
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Show Abstract
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This study aimed to evaluate population characteristics of Macrobrachium amazonicum in the Caçu hydroelectric plant reservoir, on the Claro river, in Caçu, state of Goiás, and which environmental variables (pH, turbidity, conductivity, water temperature, dissolved oxygen, nitrate, nitrite, ammonia and phosphorus) influence the intraspecific structure of the population, during the period from September 2021 to September 2022. The specimens were collected in periods of drought and rain, then, in the laboratory, they were categorized into young males, adult males, young females, adult females, ovigerous females and undefined juveniles, the Total Length (CT), Carapace Length (CC) and Weight were also measured. During the sampled period, individuals considered undefined were the majority throughout the campaign (41.03%), followed by males (22.33%) and non-ovigerous females (34.37%) and ovigerous females (2.26%). This greater presence of individuals may be related to the capture area, with a depth of less than 1m, or also that the population may be characterized as a young population. A greater abundance of individuals was observed in places with margins classified in the category of open field with grasses, the most characteristic places in the region. The environmental variables analyzed in relation to abundance were considered significant according to the canonical correspondence analysis. The turbidity parameter was the only one that showed no correlation with CT. The high number of juveniles and the smaller size of males compared to females can provide more information about the different geographically distributed populations of M. amazonicum, mainly about the region where the study took place, a reservoir of a hydroelectric plant. Thus, the study provides valuable information to complement the literature regarding the adaptability of the species in different types of habitats and help assertively define the conservation and management of different types of populations of M. amazonicum, including its place of presence , as this is an important resource for the region's ecosystem.
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2
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ERICA DE JESUS PORTUGAL
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Agroecological Productive Backyards and Environmental Education: An action-research experience in Santa Cruz Cabrália - BA.
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Advisor : MILTON FERREIRA DA SILVA JUNIOR
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COMMITTEE MEMBERS :
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EMERSON ANTONIO ROCHA MELO DE LUCENA
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MILTON FERREIRA DA SILVA JUNIOR
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PAULO ROGERIO LOPES
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RACHEL ANDRIOLLO TROVARELLI
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VINICIUS DE AMORIM SILVA
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ÉRICA SPEGLICH
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Data: Mar 31, 2023
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Show Abstract
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Knowing the productive processes based on Agroecology is a way to understand current practices of environmental awareness and the reality of Environmental Education from a transforming, emancipatory and critical perspective. Such productive processes in this ongoing Study, have in the productive backyards of the residents of the neighborhood of Nova Cabrália, municipality of Santa Cruz de Cabrália-BA, environments capable of articulating environmental problems generated in the neighborhood and in the city, in line with public policies of environmental education of the municipality. The agroecological productive backyard plays a fundamental role in this legal field, as it integrates agroecology as a science into the concept of environmental education, whose focus is to consistently confront local and planetary environmental degradation, as it includes the local community, the domestic group, which generate identity and cohesion in a social network. Furthermore, it demonstrates different guidelines for sustainable, healthy agricultural cultivation from an environmental point of view. Backyards are areas around houses, and assist in various day-to-day activities. They allow the cultivation of arboreal, fruitful, vegetable and ornamental species and animal husbandry. It rescues traditional and ancestral knowledge, having in its logic the cultivation and reproduction of Creole seeds, of medicinal plants, which interact with the production of varieties that provide fruit, along with flowers. There is also the incorporation of small animals, such as: poultry, pigs, sheep and goats. Thus, productive backyards are diversified production units, biodiversity conservation and environmental preservation. Whose knowledge built through Action-Reflection between Researchers and Researcher, comprises environmental as well as social and historical issues, direct community relations with natural resources (water, soil, forest), appreciation of dialogue and participatory methodologies in the search for resolution of environmental challenges that favor the neighborhood community. A perspective that Critical Environmental Education also defends, as well as the appreciation of knowledge and popular manifestations and not just scientific knowledge. In this direction, this Research formulated the following question: How do agroecological productive backyards constitute spaces that promote critical environmental education? This question is relevant, since it is directly associated with the knowledge constructed collectively among the research participants and collectively they are also modified or articulated with each other. As well as revealing their own perceptions and raising their levels of cooperation and participation in the transformation of reality. Thus achieving a close affinity of actions with the resolution of environmental challenges. In this way, Action Research, as a qualitative methodological resource, promotes adequate and precise support for the Study. Therefore, it enables researches to be more efficient and prepared in responding to these challenges. Through this understanding, this research also aims to deepen knowledge about the process of community involvement in the creation of agroecological productive backyards, in relation to the municipal public policy of environmental education, and to contribute to its theoretical and methodological improvement in the municipality of Santa Cruz de Cabrália-BA.
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3
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THASSIANA LACERDA COELHO
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Using LiDAR to estimate anthropogenic impacts on forestry carbon stocks
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Advisor : LUIZ FERNANDO SILVA MAGNAGO
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COMMITTEE MEMBERS :
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ANA PAULA MARQUES MARTINS
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DANIEL PIOTTO
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LARISSA SANTOS ROCHA
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LUIZ FERNANDO SILVA MAGNAGO
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MARCELA VENELLI PYLES
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MATHEUS PINHEIRO FERREIRA
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Data: May 4, 2023
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Show Abstract
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LiDAR (Light Detection and Ranging) is a technology that provides detailed measurements of forest structure in high resolution over large areas, facilitating assessments of forest carbon stocks in intact and degraded forest types. Due to the need for more detailed spatial information on how the degradation of carbon stocks occurs due to anthropogenic disturbances, the objective was (a) to verify if there is a significant difference and to accurately estimate the average carbon per hectare of different forest types using airborne LiDAR, (b) detail the edge effects on carbon stock variability and the threshold of these effects. This study was conducted in areas of native and secondary forest in the extreme south of Bahia, at RPPN Estação Veracel. The LiDAR point cloud in the RPPN area was used to quantify aboveground carbon and obtain metrics, historical land use and land cover data, and distance data from forest edges within the RPPN boundaries. For modeling, we used Mixed Generalized Linear Models (GLMM), and the breakpoint of the edge effect and the slope for each vegetation type were analyzed with piecewise linear regression. Our results showed significant differences between the carbon stocks of primary and secondary forests (p>0.001) even after a long time since the end of the disturbance. The relationship between slope and carbon stock may be related to land use history. We also found how edge effects influence forest degradation: in primary forests, the first 182 meters impact 25.07% of the carbon stock, and after this threshold tends to stabilize, while in the secondary forest, the first 48 meters impact 56.63% of the carbon stocks. Our results can be used to specify a spatially explicit relationship between edge effects and carbon stocks. Many solutions for climate mitigation based on native forests still do not have the best scientific information available to assess the variability of ecosystem services with high precision.
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4
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THAMIRES OLIVEIRA DA SILVA
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GEOMORPHOMETRY OF THE ALMADA RIVER HYDROGRAPHIC BASIN, BAHIA (BRAZIL)
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Advisor : VINICIUS DE AMORIM SILVA
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COMMITTEE MEMBERS :
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VINICIUS DE AMORIM SILVA
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ROBSON DA SILVA MAGALHAES
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EDVALDO OLIVEIRA
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PABLO SANTANA SANTOS
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Data: Jul 18, 2023
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Show Abstract
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Fluvial geomorphology is essential to understand the behavior of water in relief. Water is an essential element for the functioning of ecosystems and life. Vegetation has always had a dependent relationship with water, bearing in mind that the phytogeographic distribution is a function of water availability. And when it comes to the relationship between water and vegetation, rivers and riparian forests are examples. This work aims to analyze geomorphometry and its influence on the hydrological dynamics of the Almada River watershed (BHRA). The following methodological procedure is adopted: geoprocessing techniques; the processing of optical and radar images, and on-site visits to validate data in the field. In field data validation, the Global Positioning System (GPS) receiver device and digital photographs were used. It was identified that the basin, in evidence, has a drainage area of 1 567 km2, and a perimeter of 336 km. The BHRA has an elongated shape, with a predominance of wavy relief, being classified as (up to) 4th order of drainage. The classification of its sources is carried out from the IIAN. With results, it is expected that this work will serve as a subsidy for analysis and environmental studies in the area, and serve as a reference for decision-making, considering the sustainable point of view.
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5
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6
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JESSICA SOUSA SANTOS
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Diversity and Conservation of Rubiaceae in “Parque Estadual da Serra do Conduru, Bahia, Brazil
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Advisor : JOMAR GOMES JARDIM
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COMMITTEE MEMBERS :
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MARA LUCIA AGOSTINI VALLE
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LUIZ FERNANDO SILVA MAGNAGO
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JOMAR GOMES JARDIM
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ANDREA CARLA DALMOLIN
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WALLACE MESSIAS BARBOSA SAO MATEUS
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Data: Jul 24, 2023
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Show Abstract
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The present work consisted of a taxonomic survey of the Rubiaceae family, from Parque Estadual da Serra do Conduru (PESC), Bahia, Brazil. Collections were carried out through an active search for fertile specimens (with flowers or fruits) on pre-existing trails, edges or entering the forest. Identification of specimens was performed using specialized bibliographical references or by comparison with specimens previously identified by specialists and contained in the collection of the CEPEC herbarium and virtual herbariums. The assessment of the conservation status and risk of extinction followed the criteria of the International Union for Conservation of Nature (IUCN). Rubiaceae is represented in the PESC area by 48 species distributed in 24 genera. As for the form of life (habit), most of the species found were arboreal (28 spp.) followed by shrubs (13 spp.) and less frequent herbaceous with six (6 spp.) and epiphytes one (1 sp.), each. Of the species found, 13 are endemic to the flora of Brazil and six are registered only for the state of Bahia. Palicourea pleiocephala (Müll. Arg.) C.M. Taylor is being cited for the state for the first time. Of the total number of species registered for the PESC, 25 did not present a risk assessment in the official lists. While 10 species present some degree of risk, and six species were classified as endangered (EN) or vulnerable (VU).
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7
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KARLLA MIRANDA DA COSTA
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Quality of mechanized soil preparation operations for the implementation of cocoa farming in Una-BA, Brazil.
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Advisor : RAFAEL HENRIQUE DE FREITAS NORONHA
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COMMITTEE MEMBERS :
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ANTONIO TASSIO SANTANA ORMOND
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CARLOS ALESSANDRO CHIODEROLI
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CARLOS EDUARDO ANGELI FURLANI
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GERSON DOS SANTOS LISBOA
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MARCELO SOARES TELES SANTOS
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Data: Jul 25, 2023
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Show Abstract
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The present work is the result of the characterization of the disposition of the use of agricultural mechanization, in the production of cocoa in a family farming area of lot 42 in Colônia de Una. The results were achieved through the operational performance of agricultural implements with the objective of evaluating the best strategy to increase productivity, through a survey of existing implements and machines in the research area, calculation of the machinery's execution time; In addition to productivity analysis based on time and motion studies. And so, optimize costs in agricultural production and promote strategies for using machinery collectively through scheduling. Trinidad-type cloned cocoa management was identified, and how implements and machines were used in preparation for its planting. Determination of mechanized operation, area cleaning, soil preparation, planting and cultural treatments. The mechanization index was determined from the survey of operations and number of mechanized sets. It was possible to notice that mechanization is present in all cocoa planting activities. It can be concluded that from the implementation of control in mechanized operations in soil preparation, it allows the family farmer to have less operating costs based on the calculation of the time spent in mechanized operations. So, if the tractor and the implements are shared like those of the cooperatives, there is a better use strategy in a more optimized way.
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8
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JORGE OTÁVIO CARQUEIJA AMORIM
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The relationship and perception of the residents of Ubaitaba/Ba with the Contas river: a socio-environmental look
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Advisor : PAULO ROGERIO LOPES
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COMMITTEE MEMBERS :
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PAULO ROGERIO LOPES
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JOMAR GOMES JARDIM
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ANA CHRISTINA DUARTE PIRES
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IARA MARIA LOPES RANGEL
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KEILA CÁSSIA SANTOS ARAÚJO LOPES
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Data: Jul 26, 2023
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Show Abstract
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Debates on the society-nature relationship gain visibility at a planetary level. Water, vegetation, air, soil, vital elements for the survival of the various forms of life on the planet, have suffered losses, contamination and pollution, evidencing the unsustainability of the current capitalist model. The research aimed to analyze the socio-environmental perception of residents of neighborhoods adjacent to the Das Contas river, in the municipality of Ubaitaba/Ba. In addition, the main factors of degradation and contamination of the Das Contas River were systematized. Participant research and a qualitative/quantitative approach were used for data collection. Field research was carried out in neighborhoods located close to the river, through the application of a semi-structured questionnaire, participant observation, cross-sectional walk, photo documentation, field diary, collection and analysis of water in the laboratory. From an initial analysis it was possible to systematize the elements and actions harmful to the conservation of the river and its surroundings, showing the fragility of sustainability. On the other hand, affective ties across the river, as well as a socioeconomic relationship directly related to the reproduction of families, were voiced by interlocutors during the interviews.
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9
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JEANPIERRE RODRIGUEZ MIRANO
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ECOLOGICAL-FUNCTIONAL INTERACTIONS PROCESSES AND ABOVEGROUND BIOMASS IN FOREST RESTORATION EXPERIMENTS
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Advisor : LUIZ FERNANDO SILVA MAGNAGO
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COMMITTEE MEMBERS :
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ALEXANDRE ARNHOLD
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ANDREA CARLA DALMOLIN
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ELIVANE SALETE CAPELLESSO
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LUIZ FERNANDO SILVA MAGNAGO
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MARCELA VENELLI PYLES
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NATHALIA VIEIRA ISSA SAFAR
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Data: Jul 28, 2023
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Show Abstract
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This research is divided into two chapters. The first reviews the integration of ecological-functional processes and carbon storage in forest restoration experiments in Brazil, the systematic review followed the protocol developed by Pullin and Stewart (2006), keywords and Boolean operators were determined for later consultation in databases of Web of Sience and Scopus, the final set included 19 documents that met the criteria in 14 journals published between 2015 and June 2022, recording 75 experimental forest restoration units. Linear regression models were applied to measure the effect of the studied variables on the aboveground biomass (AGB) content, found significant relationships between the type of passive restoration, temperature and precipitation with the AGB content, in addition, they obtained Higher AGB levels were found in experiments that used a mixture of native and introduced species in forest restoration. The second chapter shows the results of monitoring 771 seedlings of 54 forest species planted in 2011 in 8 forest restoration areas in the National Forest of Goytacazes, Linhares. The objective was centered on analyzing which species groups led to better results in the growth and survival of the planted species and for the same aimed at a more efficient forest restoration, for which quarterly monitoring was carried out in the years 2012, 2013 and 2014 to collect data on mortality, herbivory, regrowth and functional traits: height (H) and crown diameter (DDC), wood density (DMS), maximum diameter (Dmax) and maximum height (Hmax). Functional groups of the monitored species were calculated, obtaining 2 functional groups, thus, Functional Group 1 (GF1) formed by 9 species achieved lower mortality cups (4.85 %) and herbivory (0.89 %), and higher regrowth cups (3.07 %) compared to Functional Group 2 (GF2) (5.14 %, 0.91 %, 1.49 %) composed of 45 species. In addition, GF1 species aim to achieve greater growth in terms of Hmax and DMS (maximum values) compared to GF2 species, but GF2 until the last year of monitoring reached a higher average than GF1 while H and DDC, in addition, the Wilcoxon Mann Whitney Test confirmed a higher median of H and DDC values in GF2 compared to GF1.
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10
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LUIZ EDUARDO SOUZA DA SILVA
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CRAFTED ADOBE PRODUCTION AND BUDGET COMPOSITION ON THE ITABUNA-ILHÉUS-URUÇUCA AXIS, BA, BRAZIL
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Advisor : SILVIA KIMO COSTA
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COMMITTEE MEMBERS :
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JOMAR GOMES JARDIM
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NADSON RESSYE SIMOES DA SILVA
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RONALDO LIMA GOMES
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SILVIA KIMO COSTA
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Data: Jul 28, 2023
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Show Abstract
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Earth has been used over the centuries as a constructive element and is directly associated with Vernacular Architecture and Bioconstruction. Among the main techniques, the handmade manufacture of adobe stands out. Considering the above, this research aimed to analyze the adobe manufacturing process in the area covered by the axis Itabuna – Ilhéus – Uruçuca; municipalities located on the South Coast of the State of Bahia, considering the costs associated with its manufacture (budget composition) in order to enable manufacturing and trade (on a larger scale) by low-income communities. The research comprised the descriptive record of the adobe manufacturing methods; identification of the most cost-effective manufacturing process(es); elaboration of budget composition and informative booklet. The study made it possible to price the unit (block) produced in the communities chosen for the analysis, whose values corresponded to R$2.34 and R$2.82. Although the second value is higher, it corresponds to the manufacturing process of the 100% handmade constructive element, and is therefore the most suitable as a parameter for a possible commercialization of the product. Providing data on the financial viability of adobe production and marketing in low-income communities not only helps to encourage the use of the building element by the general population, but also could provide financial support for the families involved in the process.
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11
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ÉDER PINHO MAGALHÃES
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PUBLIC POLICIES FOR SOCIAL AND ENVIRONMENTAL INCLUSION, COLLECTORS OF RECYCLABLE MATERIALS AND THE TRANSITION FROM THE ITABUNA-BA DUMP TO THE SANITARY LANDFILL, IN ILHÉUS-BA
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Advisor : MILTON FERREIRA DA SILVA JUNIOR
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COMMITTEE MEMBERS :
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ALESSANDRA BUONAVOGLIA COSTA PINTO
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EMERSON ANTONIO ROCHA MELO DE LUCENA
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MARCIO AUGUSTO VICENTE DE CARVALHO
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MILTON FERREIRA DA SILVA JUNIOR
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RUBENS JESUS SAMPAIO
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SILVIA KIMO COSTA
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ÉRICA SPEGLICH
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Data: Oct 20, 2023
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Show Abstract
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The present dissertation seeks to evaluate how the process of closing the landfill in ItabunaBA is taking place. Does such a transition guarantee the socio-environmental and economic insertion of recyclable material collectors, through the scheduled, formulated and implemented Public Policies? The general objective is to evaluate the inclusive socioenvironmental and economic aspects of public policies implemented in the transition process from the closure of the dump to the sanitary landfill in Ilhéus-BA. And the specific objectives focus on analyzing the transition process from closing the dump to the sanitary landfill and the positive or negative impacts on the socio-environmental and economic inclusion of workers in the solid waste production chain, in addition to systematizing, through documents, the legal impositions , the motivations of the actors involved in the elaboration and execution of public policies carried out or in progress, as well as verifying the cycle and the positive or negative impacts of the practices adopted, in the perception of the beneficiaries, while also abstracting models of monitoring and evaluation of public policies of socio-environmental inclusion for those conditions. This research is of the qualitative and quantitative type with triangulation of secondary data and the method / techniques to be used to analyze and systematize the secondary data obtained through documentary research through documents and interviews will be Content Analysis. It is hoped that this study will contribute to the construction of scientific knowledge about the evaluation of public policies, mainly those of socio-environmental and economic inclusion of recyclable material collectors.
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12
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UILTON JORGE BARRETO SANTANA AMARAL
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LAND USE AND COVER ANALYSIS IN THE UNA RIVER HYDROGRAPHIC BASIN PERMANENT PRESERVATION AREAS, BAHIA, BRAZIL.
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Advisor : ROBSON DA SILVA MAGALHAES
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COMMITTEE MEMBERS :
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EDVALDO OLIVEIRA
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GERSON DOS SANTOS LISBOA
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JOAO BATISTA LOPES DA SILVA
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LUCIANO CAVALCANTE DE JESUS FRANÇA
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RAFAEL HENRIQUE DE FREITAS NORONHA
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ROBSON DA SILVA MAGALHAES
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Data: Oct 20, 2023
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Show Abstract
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The Una River watershed is located on the southern coast of Bahia, within the Atlantic Forest Central Corridor. It is characterized as an area of extreme ecological importance, which is evidenced by the significant presence of conservation units contained within its limits. There are three conservation areas, entirely or partially contained, which are: The Serra das Lontras National Park, the Una Wildlife Refuge and the Una Biological Reserve. The main objective of this research is to conduct an analysis of land use and occupation in the permanent preservation areas of the Una River Basin. The work was carried out to analyze the dynamics of land cover and land use in the Areas of Permanent Preservation (APP) of the study area. To this end, the land cover and land use mapping of the study area was carried out. Sentinel II images from 2021 were used because they have a spatial resolution of 10 meters and are freely available for use on the Google Earth Engine platform. In data processing the use of programming languages applied to geoprocessing stands out. The technical work was developed in Restudio, through a bibliometric analysis of the objects studied in the research; Google Earth Engine, environment in which image processing and land cover and land use classification were carried out; Qgis and pycharm, responsible for the APP processing. Two of these environments are exclusively for programming in R and Python. The results indicated a higher conservation rate in the PPAs of hilltops and slopes with slope greater than 45°, having an absolute area of 4,910 and 21 ha of native forest respectively, both corresponding to a percentage greater than 90% of their total areas.
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13
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DANIELA ANDRADE DE MELO
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POPULATION STRUCTURE AND MORPHOLOGICAL MATURITY OF THE UÇÁ CRAB, Ucides cordatus (LINNAEUS, 1763) (BRACHYURA: UCIDIDAE) IN THE DISTRICT OF ACUPE, MUNICIPALITY OF SANTO AMARO-BA
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Advisor : FABRICIO LOPES DE CARVALHO
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COMMITTEE MEMBERS :
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FABRICIO LOPES DE CARVALHO
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CARLOS EDUARDO ROCHA DUARTE ALENCAR
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LUCAS REZENDE PENIDO PASCHOAL
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MOACYR SERAFIM JUNIOR
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RAFAEL DE CARVALHO SANTOS
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RÉGIS AUGUSTO PESCINELLI
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Data: Nov 24, 2023
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Show Abstract
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The crab, Ucides cordatus, is a semi-terrestrial species prevalent in mangrove areas. The species is found along the west coast of the Atlantic Ocean, from Florida (USA) to the state of Santa Catarina, in Brazil. According to Ordinance No. 034 of June 24, 2003, it is prohibited at any time, the capture, collection, transport, processing, industrialization and marketing of any individual of the species, U. cordatus whose carapace width is less than 6.0 cm (six centimeters). The present study proposes to evaluate population parameters such as: average size, sex ratio and sexual maturity of U. cordatus crabs. The collections were carried out between December 2018 and November 2019, using the "bracing" technique, in the district of Acupe, municipality of Santo Amaro - BA. After the collections, the individuals were packed in plastic bags, labeled and stored in thermal boxes and transported alive to the laboratory, where they were weighed, frozen and later sexual identification and biometry were performed. For relative growth analysis, the following measurements were established: carapace width (CL), carapace length (CL), right chelipod length (RCL), right chelipod height (RQH), left chelipod length (LCL), left chelipod height (LCH) and abdomen height (AB). A total of 298 specimens of Ucides cordatus were collected, 219 (73.48%) males and 79 (26.51%) females. When comparing the slopes of the regression line of juveniles and adults, significant values were observed for the relationships, LC x CQM and LC x CQm for males and LC x AB and LC x CQM for females. Males showed sexual morphological maturation from 54.55 mm, for the variables LC x CQM and 55.95 mm for the variables LC x CQm, showing that 50% of the population are able to reproduce with an average of 55.25 mm of carapace. For females, sexual morphological maturation occurred from 49.97 mm for LC x CQM and 50.74 mm for the variables LC x AB, showing that 50% of the females are fit to reproduce from 50.35 mm of carapace. Therefore, it is concluded that the legislation has presented great importance for the maintenance of the species, since by respecting the minimum capture size, 6 cm, the individuals of U. cordatus, have already reproduced at least once.
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14
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RUBEM PEDREIRA DE SOUZA
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Potentials of the Digital Elevation Model (DEM) gererated by remotely Piloted Uaeronaven (ARP) un mapping beach areas.
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Advisor : MARCELO SOARES TELES SANTOS
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COMMITTEE MEMBERS :
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ANDERSON TARGINO DA SILVA FERREIRA
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FRANCISCO DE DEUS FONSECA NETO
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MARCELO SOARES TELES SANTOS
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NARCISIO CABRAL DE ARAUJO
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NIEL NASCIMENTO TEIXEIRA
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VINICIUS DE AMORIM SILVA
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Data: Nov 29, 2023
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Show Abstract
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This work presented a methodology used for generating and evaluating the Digital Elevation Model (DEM) of beach areas based on a case study conducted on the North Coast of Ilhéus/ BA, Brazil. Flights were performed with the same aircraft (Phantom 4 Pro) on the same stretch of beach on the same day, using the same technical parameters; however, varying flight heights of 80, 100, and 120 m. The generation of MDE with RPA involved several stages: selection of the study area, RPA documentation for performing flight, flight planning, implementation of Control Points (PC) and Checkpoints (PV), data collection and processing with the aircraft, generation and evaluation of MDE. The evaluation of the models from external PVs positioned with GNSS revealed an accuracy of a few centimeters in planimetry and altimetry at all flight heights. This good accuracy, in addition to the high spatial resolution of the models, allowed the proper modeling of beach surfaces and the extraction of altimetric profiles throughout the study area, which is essential in numerous coastal applications. Thus, this work contributed to developing and disseminating research in modeling and coastal precision monitoring at an operational scale.
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15
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CLAUNITA NOVAIS ALVES
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Decomposition rate of cover crops and soil microbial biomass in a full sun and agroforestry cocoa cultivation system
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Advisor : JOAO CARLOS MEDEIROS
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COMMITTEE MEMBERS :
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CARLOS EDUARDO PEREIRA
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EDUARDO GROSS
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JAQUELINE DALLA ROSA
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JOAO CARLOS MEDEIROS
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PAULO CESAR LIMA MARROCOS
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RAFAELA SIMÃO ABRAHÃO NÓBREGA
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Data: Nov 30, 2023
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Show Abstract
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Cover crops are used in agricultural systems to increase organic matter content, nutrient cycling, and soil conservation. The study was conducted to evaluate the production of biomass, nutrient accumulation, decomposition rate of cover crops, and soil microbial biomass in monoculture cocoa and agroforestry systems. The experiment was carried out at Ceplac (Executive Commission of the Cocoa Farming Plan) in Ilhéus, BA. The experimental design was a randomized block design with a 3x4 factorial scheme, consisting of three treatments and four decomposition times, with four replications. The treatments consisted of three ground cover plants: 1) pigeon pea, 2) brachiaria grass, and 3) spontaneous vegetation. The decomposition rate was evaluated using litter bags. Dry mass and nutrient accumulation by the cover crops were determined. For the evaluation of soil microbial biomass, a comparison was made between the monoculture system with four treatments (1) grasses, (2) legumes, (3) spontaneous plants, and (4) bare soil, and the agroforestry system (cocoa + erythrina). Carbon and nitrogen of the microbial biomass, soil microbial activity, soil organic carbon, labile carbon, and total nitrogen were analyzed. Metabolic quotient and microbial quotient were calculated. The average dry mass production among the treatments was 10 Mg ha-1. The spontaneous vegetation and brachiaria treatments showed the highest accumulation of potassium. The highest decomposition rate occurred for spontaneous vegetation and brachiaria grass. Pigeon pea had the slowest decomposition rate, remaining on the soil for a longer time. The agroforestry system with cocoa cultivation showed higher values of microbial carbon, total nitrogen, soil organic carbon, labile carbon, and metabolic quotient compared to the monoculture system. Cocoa trees in monoculture system intercropped with legumes showed similar microbial biomass results to the agroforestry system. The study demonstrated that converting the agroforestry system to monoculture reduced soil microbial biomass. However, the use of legume cover crops has the potential to increase soil microbial biomass in the cocoa monoculture system, similar to the agroforestry system.
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