Soil Gradients
Mostrando 1-12 de 51 artigos, teses e dissertações.
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1. ENERGY PERFORMANCE IN DISC HARROWING OPERATION IN DIFFERENT GRADIENTS AND GAUGES
ABSTRACT The operational performance of the agricultural tractor can be increased by adjusting parameters such as tire inflation pressure, axle mass distribution and gauge opening, which is a very divergent factor in controlled-traffic production. The objective of the experiment was to measure the energy performance of a 93 kW agricultural tractor in interme
Eng. Agríc.. Publicado em: 09/12/2019
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2. Patterns of species richness and abundance among cactus communities receiving different rainfall levels in the semiarid region of Brazil
ABSTRACT This study examines the variation in cacti species richness and abundance among sites with different average rainfall and soil types. We assessed a total of 3,660 individuals of six species of Cactaceae: Cereus jamacaru, Melocactus zehntneri, Pilosocereus gounellei, Pilosocereus pachycladus, Tacinga inamoena, and Tacinga palmadora. The greatest spec
Acta Bot. Bras.. Publicado em: 26/10/2016
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3. Floristic composition and structure of an upper montane cloud forest in the Serra da Mantiqueira Mountain Range of Brazil
We analyzed the community structure of an upper montane cloud forest (elevation, 1900 m) in the Serra da Mantiqueira Mountain Range, in the state of Minas Gerais, Brazil. Our objective was to determine the comparative tree species richness and floristic diversity within this forest, which is at one of the higher elevations in the range, in relation to surrou
Acta Bot. Bras.. Publicado em: 2014-09
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4. Extractability of copper and application of diffusive gradients in thin films: metal availability in contaminated soil by biosolids
O objetivo deste estudo foi utilizar a técnica de difusão em filmes finos por gradiente de concentração (DGT) para a avaliação da disponibilidade de cobre em solos com elevados níveis do metal, que foi alterado com biossólidos, além de comparar esta técnica com procedimentos de extração simples e sequenciais, considerando a extractabilidade do me
J. Braz. Chem. Soc.. Publicado em: 2013-09
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5. Gradientes edáficos e sua relação com as fitofisionomias do semi-árido meridional brasileiro / Edaphic gradients and their relationship with the vegetation types of semi-arid southern Brazil
The semi-arid region in Brazil represents a significant territorial extension, where the climate is markedly seasonal, with low rainfall, high evapotranspiration and higher temperatures. Its southern portion comprises the northern boundary between the states of Minas Gerais and Bahia. This region is dominated by dry forest vegetation type, however, different
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/02/2012
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6. Variações altitudinais na diversidade e composição em espécies de vespas e abelhas (Hymenoptera: Aculeata)
Distribution patterns of insects along elevational gradients have been described for many tropical mountains. According to the hypothesis of elevational gradient, species richness and abundance of species tend to decrease in higher altitudes. Aculeata is considered a monophyletic lineage of Hymenoptera order. They are important pollinators, but there are few
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/05/2011
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7. Composição e partição de nicho em gradientes de solo e luz no Cerrado / Composition and niche partitioning in relation to soil and light gradients in Cerrado
O Cerrado se distribui sob fitofisionomias que variam de campos abertos com arbustos dispersos a fisionomias de mata fechada, em um gradiente crescente de fertilidade e de decrescente acidez do solo. Considerando que é esperada a maior similaridade entre áreas de condições estruturais e de solo semelhantes, este estudo foi realizado em cinco fitofisionom
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/02/2011
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8. Análise de gradientes de solo e vegetação em mata ciliar do Rio São Francisco, norte de Minas Gerais, para fins de restauração florestal / Analysis of soil and vegetation gradients in the riparian forest of Rio São Francisco, Minas Gerais, for forest restoration
O presente trabalho teve como objetivo o estudo do componente arbustivoarbóreo em um gradiente pedológico-vegetacional de mata ciliar com influência aluvial, no Parque Estadual da Mata Seca, norte de Minas Gerais. Foram investigadas: (i) a diversidade e estrutura da vegetação e suas relações com as variáveis edáficas; (ii) a influência das caracter
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/02/2011
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9. Padrões florísticos e estruturais das Florestas Estacionais Semideciduais do Triângulo Mineiro, MG / Floristic and structural patterns of semideciduous seasonal forests of Triângulo Mineiro, MG
The semideciduous seasonal forests (SSF) of southeastern Brazil have a high floristic diversity, accompanied by a high beta diversity, even between nearby fragments. However, nowdays these forests have been represented by a large number of small fragments, a landscape pattern typical for this region. In addition to the processes related to fragmentation, the
Publicado em: 2010
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10. Influence of the distance of installation of tensiometers to calculate total potential gradient in the field soil hydraulic conductivity determination / Influência da distância de instalação de tensiômetros no campo para o cálculo do gradiente de potencial total no método do perfil instantâneo
The soil hydraulic conductivity determination method most used under unsaturated field conditions is the instantaneous profile method. This method is based on the integration of Richards equation in relation to soil depth, during the soil water redistribution process, after the profile has been saturated till the interest depth and the soil surface prevented
Publicado em: 2009
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11. Partition of root water extraction between soil layers with distinct hydraulic properties / Partição da extração da água do solo por plantas entre camadas com propriedades hidráulicas distintas
Root water extraction is determined by soil hydraulic conductivity and water potential gradients, both dependent on soil water content. In this dissertation the experimental test of a root water extraction and partition model is described for a plant whose root system is divided over soil layers with distinct hydraulic properties. An experiment was conducted
Publicado em: 2009
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12. Relações solo-vegetação no Parque Nacional da Serra do Cipó, Espinhaço Meridional, Minas Gerais / Soil vegetation relationships in the National Park Serra do Cipó, in Espinhaço Meridional, Minas Gerais
The region of Serra do Rio Cipó, in the southern part of the Serra do Espinhaço, comprises large areas of Cerrado, Atlantic forest, forest islands and one of the richest high-altitude rocky vegetation in Brazil. The ecotonal character between the Cerrado and Atlantic Forest biomes, described in many studies of regional flora and fauna, is one of the factor
Publicado em: 2009