Made available in DSpace on 2011-03-23T21:19:16Z (GMT). No. of bitstreams: 0 / Item created via OAI harvest from source: http://www.bdtd.ufpa.br/tde_oai/oai2.php on 2011-03-23T21:19:16Z (GMT). Item's OAI Record identifier: oai:bdtd.ufpa.br:88 / The Aςaizeiro (Euterpe Oleracea Mart.) is one of the main sources of income and consumption for people (local farmer families known as ribeirinhos) living in the municipal district of Belém, State of Pará. They manage the fruit of the aςaizal (aςaí palm trees) and, among the other products, the palm heart, commonly known as palmito. The objective of this study was to identify and classify the different agricultural practices used in the management of native aςaizais. The analysis include a study of the different types of management used by the ribeirinhos with the objective of contributing to the implementation of proposals of management of native aςaizais. The research was undertaken in two main islands in Belém, known as Ilha de Paquetá (Paqueta island) and Ilha Grande (Big Island). The study approach was based on the methodology of the diagnostics of agrarian systems, which involve interviews with both open and closed questions. Twenty-two families from Ilha Grande and thirty-one families from Ilha de Paquetá were interviewed, and the questions involved issues concerning the family, the living environment, patrimony, the agrarian situation, income, techniques used in the management of açaizal and commercialization. Research findings showed that the system of management of native açaizais has gone through three phases. In the first phase, the collection of the açaí fruit is basically for consumption. In the second phase, the palm heart started to be commercialized and the açaí fruit continues to be used for consumption. In the third phase, the actual system of management is oriented to the production of the açaí fruit for commercial and consumption purposes, with the palm heart contributing additional income. Findings from the survey showed that the three main techniques used in the management of açai crop are intensive, moderate and natural cropping (without handling). The intensive 6 handling requires intensive labor in the açaizais and the ribeirinhos income comes basically from the açaí fruit. This type of technique has shown to yield the best overall results. The moderate handling requires less labor in the açaizal and ribeirinhos complement their income from other sources. The natural cropping (without handling) just involves the harvest of the açaí fruit and the ribeirinhos income comes from activities away from the farm. / O açaizeiro (Euterpe oleracea Mart.) é um dos principais componentes da renda e do consumo de ribeirinhos do Município de Belém, Estado do Pará, que manejam o açaizal para a produção de frutos, tendo o palmito como subproduto. O objetivo deste trabalho foi o de identificar e caracterizar os diferentes tipos de manejo de açaizais nativos, praticados por estes ribeirinhos. A pesquisa foi realizada na Ilha de Paquetá e Ilha Grande, Município de Belém, onde foram analisados os diferentes tipos de manejo e as diferentes estratégias dos ribeirinhos, com vistas a contribuir com a implantação de propostas de manejo de açaizais nativos. Os estudos foram baseados na metodologia de diagnóstico de sistemas agrários, nos quais foram entrevistadas 22 famílias da Ilha Grande e 31 famílias de Paquetá, com auxílio de questionários elaborados com perguntas abertas e fechadas, abordando a família, a habitação, o patrimônio, a situação fundiária, a renda, o manejo de açaizal e a comercialização. Os resultados mostraram que o sistema de manejo de açaizal nativo passou por três fases: o extrativismo de coleta de açaí fruto destinado basicamente para o consumo; a extração de palmito para a comercialização e o açaí fruto basicamente para o consumo e o sistema atual de manejo, orientado para a produção de açaí fruto para a comercialização e consumo, atribuindo ao palmito um complemento da renda. Verificou-se que os ribeirinhos realizam, de acordo com suas estratégias, três tipos de manejo de açaizais: o intensivo, o moderado e o sem manejo. O manejo intensivo é aquele que está intensificando o uso da mão-de-obra no açaizal, vive basicamente do açaí fruto e obteve a melhor produtividade de frutos. O manejo moderado aplica menos mão-de-obra no açaizal e completa sua renda com outras fontes. O sem manejo faz apenas a colheita do açaí fruto e vive de atividade extralote.

Made available in DSpace on 2011-03-23T21:19:31Z (GMT). No. of bitstreams: 0 / Item created via OAI harvest from source: http://www.bdtd.ufpa.br/tde_oai/oai2.php on 2011-03-23T21:19:31Z (GMT). Item's OAI Record identifier: oai:bdtd.ufpa.br:225 / This work had as objective the study of the economic viability for the Euterpe oleraceas Mart. (açaí) seed use as energy resource in the city of Belém-PA. Initially, it was realized a field survey of the sail points and quarters of biggest production of açaí, carrying through after that the assays of the termogravimetric properties of the seeds that are: Humidity text, volatile text, cinzas text, fixed carbon text and superior calorific power. The survey points made possible the creation of a data base, using the Microsoft Software Access, which supplies reports with the identification of the proprietors name, as well as the number of bags that is it processes per day, weight of bag and its energy potential. It was used still the Microsoft ARC VIEW, of easy interaction with Access that made possible the creation of an up to date map of the points for the city of Belém-PA. With those data a study of the transport routes was made in the Geographic Information System (GIS) GOOGLE EARTH. There were determined routes, through the Centroid method, which is the point of highest concentration of the variable of study, in this case, the açaís seed, for the transport of biomass to its final destination that is the UFPA, where if it finds the plant that uses the biomass as combustible to generate energy. When calculating the economic viability there were used the plant of Energy and Biomass of the Group of Energy, Biomass and Environment (EBMAs) together with the data of the consumption of electric energy of the UFPA in the period from 06/2006 to 06/2007, finally it was realized a comparison between the values gotten in the two done surveys and the confirmation of how much the UFPA would save in financial and energy terms with the biomass energy use. In conclusion the açaís seed is economically viable as energy resource for energy supply in UFPA, since the cost of supplied electric energy the concessionaire services the CELPA must exceed the cost of the renewable generation system, thus causing an economy in the final value, of the consumption of electric energy. / Este trabalho tem como objetivo o estudo da viabilidade econômica para a utilização da semente da Euterpe oleracea Mart. (açaí) como recurso energético na cidade de Belém-PA. Para isso foi feito um levantamento de campo dos pontos de venda e bairros de maior produção de açaí, realizando em seguida os ensaios das propriedades termogravimétricas das sementes: Teor de umidade, teor de voláteis, teor de cinzas, teor de carbono fixo e o poder calorífico superior. O levantamento dos pontos possibilitou a criação de um banco de dados, utilizando o software Microsoft Acess, o qual fornece relatórios com a identificação do nome do proprietário, assim como número de sacas que ele processa por dia, peso da saca e o potencial energético de cada produtor. Foi utilizado ainda o Microsoft ARC VIEW, de fácil interação com o Acess e que possibilitou a criação de um mapa atualizado dos pontos de venda para a cidade de Belém-PA. De posse desses dados passou-se para o estudo das rotas de transportes, através do Sistema de Informação Geográfica (SIG) GOOGLE EARTH. Foram determinadas rotas, através do método do Centróide, ou seja, o ponto de maior concentração da variável de estudo, neste caso, a semente de açaí, para o transporte da biomassa até seu destino final que é a UFPA, onde se encontra a usina que utiliza a biomassa como combustível para gerar energia. No cálculo da viabilidade econômica, utilizaram-se os parâmetros da usina de geração de energia elétrica do Grupo de Energia, Biomassa e Meio Ambiente EBMA, juntamente com os dados do consumo de energia elétrica da Universidade Federal do Pará - UFPA no período de 06/2006 a 06/2007, fazendo-se comparação nos valores obtidos nos levantamentos e a confirmação do quanto a UFPA economizaria em termos financeiros com a utilização da energia oriunda da queima de biomassa. Concluindo-se assim que a semente de açaí como recurso energético é economicamente viável para suprir toda a energia da UFPA, uma vez que o custo da energia elétrica fornecida pela Concessionária CELPA mostrou ser superior ao custo da geração com o sistema utilizado, ocorrendo assim, uma economia no valor final do consumo de energia elétrica.

Economic changes such as rising açaí prices and the availability of off-farm employment are transforming the landscape of the Amazonian várzea, subject to decision-making at the farming household level. Land use change results from complex human-environment interactions which can be addressed by an agent-based model. An agent-based model is a simulation model composed of autonomous interacting entities known as agents, built from the bottom-up. Coupled with cellular automata, which forms the agents’ environment, agent-based models are becoming an important tool of land use science, complementing traditional methods of induction and deduction. The decision-making methods employed by agent-based models in recent years have included optimization, imitation, heuristics, classifier systems and genetic algorithms, among others, but multiple methods have rarely been comparatively analyzed. A modular agent-based model is designed to allow the researcher to substitute alternative decision-making methods. For a smallholder farming community in Marajó Island near Ponta de Pedras, Pará, Brazil, 21 households are simulated over a 40-year period. In three major scenarios of increasing complexity, these households first face an environment where goods sell at a constant price throughout the simulated period and there are no outside employment opportunities. This is followed by a scenario of variable prices based on empirical data. The third scenario combines variable prices with limited employment opportunities, creating multi-sited households as members emigrate. In each scenario, populations of optimizing agents and heuristic agents are analyzed in parallel. While optimizing agents allocate land cells to maximize revenue using linear programming, fast and frugal heuristic agents use decision trees to quickly pare down feasible solutions and probabilistically select between alternatives weighted by expected revenue. Using distributed computing, the model is run through several parameter sweeps and results are recorded to a cenral database. Land use trajectories and sensitivity analyses highlight the relative biases of each decision-making method and illustrate cases where alternative methods lead to significantly divergent outcomes. A hybrid approach is recommended, employing alternative decision-making methods in parallel to illustrate inefficiencies exogenous and endogenous to the decision-maker, or allowing agents to select among multiple methods to mitigate bias and best represent their real-world analogues.

Economic changes such as rising açaí prices and the availability of off-farm employment are transforming the landscape of the Amazonian várzea, subject to decision-making at the farming household level. Land use change results from complex human-environment interactions which can be addressed by an agent-based model. An agent-based model is a simulation model composed of autonomous interacting entities known as agents, built from the bottom-up. Coupled with cellular automata, which forms the agents’ environment, agent-based models are becoming an important tool of land use science, complementing traditional methods of induction and deduction. The decision-making methods employed by agent-based models in recent years have included optimization, imitation, heuristics, classifier systems and genetic algorithms, among others, but multiple methods have rarely been comparatively analyzed. A modular agent-based model is designed to allow the researcher to substitute alternative decision-making methods. For a smallholder farming community in Marajó Island near Ponta de Pedras, Pará, Brazil, 21 households are simulated over a 40-year period. In three major scenarios of increasing complexity, these households first face an environment where goods sell at a constant price throughout the simulated period and there are no outside employment opportunities. This is followed by a scenario of variable prices based on empirical data. The third scenario combines variable prices with limited employment opportunities, creating multi-sited households as members emigrate. In each scenario, populations of optimizing agents and heuristic agents are analyzed in parallel. While optimizing agents allocate land cells to maximize revenue using linear programming, fast and frugal heuristic agents use decision trees to quickly pare down feasible solutions and probabilistically select between alternatives weighted by expected revenue. Using distributed computing, the model is run through several parameter sweeps and results are recorded to a cenral database. Land use trajectories and sensitivity analyses highlight the relative biases of each decision-making method and illustrate cases where alternative methods lead to significantly divergent outcomes. A hybrid approach is recommended, employing alternative decision-making methods in parallel to illustrate inefficiencies exogenous and endogenous to the decision-maker, or allowing agents to select among multiple methods to mitigate bias and best represent their real-world analogues.

A Euterpe edulis (palmeira juçara) é uma espécie de alta densidade na Floresta Atlântica e sofre processo de extinção devido ao desmatamento e ao corte ilegal para a extração do palmito. Uma alternativa para conservação é o manejo sustentável, utilizando seus frutos para a produção de polpa. O objetivo do trabalho é fornecer subsídios de mensuração para um sistema de manejo, visando à produção de frutos e polpa, através de modelos preditivos e, avaliação da estrutura, dinâmica e a regeneração natural das palmeiras. O levantamento foi realizado no Sertão do Ubatumirim, Ubatuba-SP, em uma área de bananal e uma de floresta secundária, durante 2011 e 2012. Para a construção dos modelos, foram selecionadas matrizes produtoras acompanhadas durante o período de frutificação. Foram coletadas medidas dendrométricas e os frutos maduros foram colhidos, pesados, despolpados e analisada sua massa seca. Foi avaliada qualitativamente a luminosidade recebida pelas matrizes. Foram ajustados e selecionados modelos para a predição da biomassa dos frutos e polpa seca. As variáveis preditoras foram: DAP, altura, e as indicadoras: área, ano e luz, com efeito simples e de interação. As variáveis resposta foram modeladas por regressão linear, com e sem transformação logarítmica. Os critérios de seleção dos modelos foram o coeficiente de determinação ajustado e o valor do Critério de Informação de Akaike (AIC). Para o levantamento das populações, em cada área foram locadas dez parcelas circulares, com 14m de raio, sendo mensuradas e identificadas as espécies arbóreas com DAP >= 5cm. Dentro das parcelas instituiu-se subparcelas para a amostragem da regeneração natural da juçara; com raio de 4,5m para os estádios de desenvolvimento das varas e arvoretas e raio de 3m para plântulas e mudas. Foi estimada a taxa de mortalidade de toda população e das palmeiras adultas. De cada estádio estimou-se os indivíduos por hectare e taxa de mudança anual. A regeneração encontrada foi comparada com uma estrutura padrão, sem ações antrópicas. Foi estimada a biomassa de frutos e de polpa da juçara nas áreas estudadas através de modelos lineares. Os modelos com transformação logarítmica apresentaram bons ajustes sendo os mais adequados os que utilizaram a combinação da variável indicadora altura ou variável combinada (diâmetro ao quadrado vezes altura). Os resultados mostraram efeito de interação da variável combinada e variável ano, o que indicou efeito nulo no ano de alta produtividade. Independente do tamanho das palmeiras, a produção foi igual, e efeito positivo crescente no ano de baixa produtividade. Os levantamentos mostraram que a área de formação secundária possui maior riqueza de espécies que a do bananal, com uma área basal duas vezes maior e menor taxa de mortalidade. Em ambas as áreas, os estádios plântulas e regeneração não se assemelham à população padrão, resultados estes mais drásticos na área do bananal. Isto pode levar à redução da população, com risco de desaparecimento. Na estimativa produtiva dos frutos por matriz, verificou-se o aumento entre os anos de produção. Quando se considera a produção por hectare, ocorre diminuição da produção na área do bananal devido a elevada mortalidade. / Euterpe edulis (juçara palm) occurs in hight density populations in the Atlantic Forest, but due the illegal exploration of its heart palm is a extinction threaten species. An alternative for its conservation is the sustainable management of its populations for fruit production. This study aims to provide measurement and biometric information for the development of a sustainable management system for fruit harvest. Prediction models for fruit and fruit pulp production were developed and the structure and natural regeneration of two populations were studied. The study was carry out in \"Sertão do Ubatumirim\", Ubatuba, in the state of São Paulo, where a banana plantation and a secondary forest were surveyed in the years 2011 and 2012. In order to develop the fruit prediction models, producing fruit palm trees were monitored throughout the period of fructification. Height and diameter measurements were taken in these trees and the ripe fruits were harvested, weighted, pulped and the fruit pulp dry weight was determined. The light intensity received by each tree was qualitatively determined by a ordinal scale with 5 levels. Prediction models for fruit biomass and fruit pulp dry weight were fitted by linear regression. Prediction quantitative variables were diameter (DBH) and height, while prediction qualitative variables, add to the model as indicator variables, were: forest type (banana plantation and secondary forest), harvest year (2011 and 2012) and light intensity. The criteria for selection of the models were adjusted coefficient of determination and the value of the Akaike Information Criteria (AIC). For the population surveys, circular plots of 14m radius were located in the study area, and all trees with DBH equal or greater than 5cm were measured and had its species identified. For the survey of juçara natural regeneration, circular subplots of 4.5m radius, concentric to adult tree plots, were established to enumerate small trees and saplings, and circular subplots of 3m radius were established to enumerate seedlings and small seedlings. Mortality rate was estimated of the entire population and adult juçara palms. For each plant development stage (tree, small tree, sapling, seedling and small seedling), the number of individuals and the annual change rate were also estimated. Best prediction models for individual palm tree fruit and fruit pulp production were logarithmic models, and prediction variable was tree height, followed by the combined variable (squared diameter times height). There was a clear interaction effect of the quantitative prediction variable (combined variable) and the qualitative prediction variable year, as indicator variable. In the hight production year, the quantitative prediction variable was not relevant for fruit and fruit pulp prediction, while in the low production year, there was a positive relationship between production and the quantitative prediction variable. Study sites were very different in forest structure and dynamics. As expected, the secondary forest site had higher species richness than the banana plantation site, as well lower mortality rate and twice its basal area. Compared to what is expected to sustainable juçara populations without human influence, both sites showed lower number of regenerating individuals (seedlings and small seedlings). Over the years, this fact, combined to the harvest of fruits for fruit pulp production, can represent risk to the sustainability of juçara populations in the study sites.