14 resultados para DESPRENDIMIENTO DE TIERRAS

em Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho"


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Brazil's Atlantic Forest ecosystem has been greatly affected by land use changes, with only 11.26% of its original vegetation cover remaining. Currently, Atlantic Forest restoration is receiving increasing attention because of its potential for carbon sequestration and the important role of soil carbon in the global carbon balance. Soil organic matter is also essential for physical, chemical and biological components of soil fertility and forest sustainability. This study evaluated the potential for soil recovery in contrasting restoration models using indigenous Atlantic Forest tree species ten years after their establishment. The study site is located in Botucatu municipality, São Paulo State-Brazil, in a loamy dystrophic Red-Yellow Argisol site (Typic Hapludult). Four treatments were compared: i) Control (Spontaneous Restoration); ii) Low Diversity (five fast-growing tree species established by direct seeding); iii) High Diversity (mixed plantings of 41 species established with seedlings) and; iv) Native Forest (well conserved neighboring forest fragment). The following soil properties were evaluated: (1) physical-texture, density and porosity; (2) chemical-C, N, P, S, K, Ca, Mg, Al and pH; (3) biological-microbial biomass. Litter nutrient concentrations (P, S, K, Ca and Mg) and C and N litter stocks were determined. Within ten years the litter C and N stocks of the Low Diversity treatment area were higher than Control and similar to those in both the High Diversity treatment and the Native Forest. Soil C stocks increased through time for both models and in the Control plots, but remained highest in the Native Forest. The methods of restoration were shown to have different effects on soil dynamics, mainly on chemical properties. These results show that, at least in the short-term, changes in soil properties are more rapid in a less complex system like the Low Diversity model than in the a High Species Diversity model. For both mixed plantation systems, carbon soil cycling can be reestablished, resulting in increases in carbon stocks in both soil and litter.

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El objetivo de este trabajo fue evaluar el comportamiento agronómico de seis mezclas de cobertura, elaboradas a partir de sustrato postcultivo del champiñón Agaricus bisporus, en nuevos ciclos de cultivo. Los resultados obtenidos mostraron la viabilidad de la reintroducción del sustrato en nuevos ciclos de cultivo, ya sea como material de base único, si se somete a un proceso de lavado para eliminar sales solubles, o bien mezclado con otros materiales de baja conductividad, como es el caso de la turba rubia o la fibra de coco. Se destacan los altos valores de efiCiência biológica registrados, que llegaron hasta los 100 kg kg-1 de compost, similares a los proporcionados por los testigos, y los altos valores relativos observados (con respecto a los testigos) en el contenido en materia seca de los carpóforos cosechados con algunas de las nuevas coberturas elaboradas. Esta reutilización del compost constituye una alternativa interesante, con vistas a reemplazar a las tierras y a los sustratos orgánicos utilizados habitualmente como cobertura, con la doble ventaja de disminuir los costos de elaboración y el impacto ambiental.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em Serviço Social - FCHS

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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A questão agrária é da essência do modo capitalista de produção. A existência ou não do campesinato nesse modo de produção é justamente o cerne da discussão. A questão agrária pode ser interpretada de diferentes formas, por meio de correntes teóricas ou até mesmo paradigmas, como o caso do Paradigma da questão Agrária e o Paradigma do Capitalismo Agrário. Neste trabalho procuro defender a ideia de que a questão agrária é um problema estrutural do capitalismo, atualizada conjunturalmente por diferentes elementos, sejam eles de cunho social, político ou econômico. Um destes elementos, destacado nesta pesquisa, é justamente a luta pela terra em escala nacional e regional. A criação e recriação do campesinato no Brasil tem se dado, principalmente, a partir da luta pela terra, materializada em ocupações, acampamentos e, conseqüente, criação de assentamentos rurais. Em escala nacional, discuto a diminuição das ocupações de terra e de novos acampamentos nos últimos anos, com o intuito de compreender as possíveis causas. Já, em escala regional, no Pontal do Paranapanema-SP, algumas mudanças no que diz respeito à mobilização das famílias semterra e a esporacidade da vida nos acampamentos são apresentadas a fim de colaborar com a discussão sobre a dinâmica, contemporaneidade e perspectiva da luta pela terra

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Pós-graduação em Geografia - FCT

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In this research, made with riparians ousted by the construction of an hydroelectric power station, were gathered histories of the time when they were living in the edges of the river and of the current life in the town constructed in substitution to the ancient village flooded by the dam. In the histories, they proliferate images of a time of abundance, of fishing and of the fertile land that they were cultivating on the edge of the river. They describe the old village, with wealth of details, their achievements in the fishing and in the challenge of the mysteries of the forest and of the ferocity of the wild animals. They talk about the daily life of the ancient village like a community in which they were near and supportive. In the current narratives the protest and the revolt remain against the construction of the hydroelectric power station that took away the river and the rich riverside life, placing them at a place that they find sterile and devitalized.

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El ensayo presenta una lectura crítica de la obra medieval conocida como el Itinerario de Eteria, en la cual la autora relata los viajes de peregrinación a las Tierras Santas que realizó a finales del siglo IV y comienzos del V a. C..

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The objective of the research was to define the classes of use capacity of 2403.25 ha in the basin of the Corriente del Lobo - Itatinga (SP), (22°03'56" to 22°59'12" of latitude S and 48°38'47" to 48°41'25" of longitude W Gr.). The soil use capacity was obtained by using the SIG IDRISI 32 crossing the documents of steepness and soils and the document of judgment of classes of soil use capacity and of the utilitarian rising of the physical milieu. The classes and subclasses areas of use capacity presented the following values: IIIa - 68.60 ha (2.85%), IIIe,s - 1919.15 ha (79.86%); IIIe - 210.60 ha (8.76%); IVe - 3.38ha (0.14%); IVe,s - 157.42 ha (6.55%) and VIe,s - 44.10 ha (1.84%). The lands of the basin were distributed in three classes (III, IV and VI) and six subclasses but the biggest extension (79.9%) belonged to the subclass IIIe,s. The modules of the IDRISI allowed to discriminate, mapping and to quantify quickly the soil use capacity of the areas of classes and subclasses in the basin.