Pastures Amazonian
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Changes in the soil carbon stocks due to agricultural land use in the Southwest Amazonian / Mudança no estoque de carbono do solo devido ao uso agrícola da terra no Sudoeste da Amazônia
Land use changes such as conversion of natural ecosystems to agro ecosystems are shown to cause alterations in the transformations of soil organic matter (SOM), as well they are responsible for crescent emissions of greenhouse gases (GEE), therefore representing around 20% of total GEE emissions. Over the last 30 years, land deforestation has occurred more i
Publicado em: 2008
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2. Avaliação da qualidade física de solos em pastagens degradadas da Amazônia / Evaluation of the soil physical quality in degraded pastures of the Amazonian
A região amazônica possui extensas áreas que foram desmatadas e convertidas em sistemas de pastagens. A falta de técnicas na implantação e no manejo destes sistemas resultou em inúmeras áreas de pastagens degradadas. A condução de experimentos de campo visando a reversão deste quadro está sendo avaliada no presente estudo. A área em estudo está
Publicado em: 2006
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3. Albedo of an Amazon tropical rainforest: field measurements, remote sensing, modeling, and its influence on the regional climate / Albedo de uma floresta tropical Amazônica: medições de campo, sensoriamento remoto, modelagem, e sua influência no clima regional
Albedo is defined as a ratio between reflected solar radiation and incoming solar radiation over a surface. It is a main factor that affects the terrestrial radiation balance and has been frequently considered in the global and regional climate studies. Amazon is one of planets regions where the response of regional atmospheric circulation is more intense. S
Publicado em: 2006
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4. The role of suspended sediments in the metabolism of micro and meso scale rivers of Rondonia, Brasil. / O papel dos sedimentos em suspensão no metabolismo de rios de micro e meso-escala no estado de Rondônia.
Amazonian surface waters, encompassing rivers of distinct orders, from small streams to one of the largest of the world, the Amazon, are important components of the functioning of this continental-scale ecosystem. A paradigm about fluvial systems is that they integrate the processes that occur at their watersheds and, therefore, changes in land use/cover may
Publicado em: 2005
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5. Mecanismos de sociabilidade Enawene Nawe e o papel da opan- Operação Amazônia Nativa- na defesa do território
Nowadays there are more than two hundred Indian tribes in Brazil, who speak around a hundred seventy different languages. These tribes have a total of about three hundred fifty thousand individuals. Most of them gather in Legal Amazonia, where the globalization economic process has raced the implementation of development models, responsible for social and en
Publicado em: 2005
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6. Evolution of the land use in portion of the occidental Amazon (Acre), with use of changes detention technique / Evolução do uso da terra em porção da Amazônia ocidental (Acre), com uso de técnicas de detecção de mudanças
The Brazilian Amazon has been objective of activities that are transforming extensive areas of humid tropical forest in areas destined to the agriculture and pastures, contributing to the alteration of the atmosphere and of the Amazon landscape. Starting from the decade of 60, the state of Acre, started to suffer great pressure through the migration and peop
Publicado em: 2001
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7. Cigarrinhas das pastagens (Homoptera, Cercopidae) : distribuição geografica e variabilidade genetica
The present work is the result of a survey on the geographic distribution, wing and enzymatic polymorphism, followed by some "information on the biology of several froghopper species found in Brazilian pastures. Among these species four were analyzed in closer de-tail: Deois schach (Fabr., 1787); Deois flavopicta (Sta1, 1854); Deois sp. e ZuZia entreriana (B
Publicado em: 1981
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8. Genetic rescue of remnant tropical trees by an alien pollinator.
Habitat fragmentation is thought to lower the viability of tropical trees by disrupting their mutualisms with native pollinators. However, in this study, Dinizia excelsa (Fabaceae), a canopy-emergent tree, was found to thrive in Amazonian pastures and forest fragments even in the absence of native pollinators. Canopy observations indicated that African honey