109 resultados para Ciências Exata e da Terra


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Pós-graduação em História - FCHS

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Pós-graduação em Educação - FFC

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From the agri-food crisis of 2007/2008, we live an intensifying period in the global land rush. The land grabbing is analyzed as a process that occurs on a global scale, especially to countries in Africa and Latin America, the main targets of the current global competition for land, because beyond the earth have low prices and the legislation be flexible, low and ineffective supervision of the state (especially in the issue of environmental and labor laws), also have vast tracts of arable land, with fertile soils and high availability of water resources (the latter element has become relevant in that case analysis). In addressing the land foreignization in the XXI century it is necessary to speak about the issue of biofuels and bioenergy, since it is these that define the current phase of land foreignization in Brazil. In the 1970s occurred the first incentive to produce ethanol in the sugarcane cultivation, with the policy of the National Alcohol Program (PROALCOOL). From the 2000s this interest again sharpened up and foreign capital began to see in Brazil a great opportunity for a production facility and purchase of old agro-processing plants that were implanted in PROALCOOL period but who were disabled. This is the case of Umoe Bioenergy, Norwegian company that in 2006 started its production in the municipalities of Narandiba and Sandhurst, located in the Pontal do Paranapanema region that, in turn, is the region of São Paulo with larger agrarian conflicts, settlements land reform, land grabbing and high poverty rates...

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Pós-graduação em Agronomia (Ciência do Solo) - FCAV

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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All trees with diameter at breast height dbh >= 10.0 cm were stem-mapped in a "terra firme" tropical rainforest in the Brazilian Amazon, at the EMBRAPA Experimental Site, Manaus, Brazil. Specifically, the relationships of tree species with soil properties were determined by using canonical correspondence analyses based on nine soil variables and 68 tree species. From the canonical correspondence analyses, the species were grouped into two groups: one where species occur mainly in sandy sites, presenting low organic matter content; and another one where species occur mainly in dry and clayey sites. Hence, we used Ripley's K function to analyze the distribution of species in 32 plots ranging from 2,500 m(2) to 20,000 m(2) to determine whether each group presents some spatial aggregation as a soil variations result. Significant spatial aggregation for the two groups was found only at over 10,000 m(2) sampling units, particularly for those species found in clayey soils and drier environments, where the sampling units investigated seemed to meet the species requirements. Soil variables, mediated by topographic positions had influenced species spatial aggregation, mainly in an intermediate to large distances varied range (>= 20 m). Based on our findings, we conclude that environmental heterogeneity and 10,000 m(2) minimum sample unit sizes should be considered in forest dynamic studies in order to understand the spatial processes structuring the "terra firme" tropical rainforest in Brazilian Amazon.

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Pós-graduação em Agronomia (Irrigação e Drenagem) - FCA