Efeitos do manejo em propriedades físicas e no carbono orgânico total de um argissolo vermelho-amarelo localizado na Zona da Mata Mineira

• Ano de defesa: 2009
• Autor(a) principal: Hickmann, Clério
• Orientador(a): Costa, Liovando Marciano da
• Banca de defesa: Fernandes Filho, Elpídio Inácio , Olszevski, Nelci
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Solos e Nutrição de Plantas
• Departamento: Fertilidade do solo e nutrição de plantas; Gênese, Morfologia e Classificação, Mineralogia, Química,
• País: BR
• Palavras-chave em Português: Manejo do solo; Propriedades físicas; Estoque de carbono
• Palavras-chave em Inglês: Soil management; Physical properties; Carbon stocks
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO
• Link de acesso: http://locus.ufv.br/handle/123456789/5420

When the replacement of natural ecosystems for agroecosystems occurs, generally it is perceived a physical deterioration and a decline in soil carbon content. This degradation can be attributed to intensive soil tillage, exposing it to the action of climatic factors, causing erosion, mineralization of organic matter and oxidation of organic carbon in soil. The use of conservation practices for soil management has received much attention nowadays, primarily with regard to the maintenance and improvement of physical, chemical and biological properties of cultivated soils, and its implications in crop yield. Based on the assumption that the conservation systems improve conservation of soil physical quality, this study aimed to evaluate the changes caused in the physical properties and organic carbon, under different management systems, in a Red-Yellow Argisol, subjected to a long term experiment. For this, samples were collected from the soil layers 0-5, 5-10, 10-20 and 20-40 cm in depth in an experiment involving four treatments, as follows: NT (no-tillage), DP (disc plow); DP + HH (disc plow + heavy harrow) and HH (heavy harrow). An area under secondary atlantic forest (SF), adjacent to the experiment, was sampled and used as reference, representing the fifth treatment. It were evaluated the soil bulk density, particle density, flocculation degree, water dispersible clay, granulometry, porosity, saturated soil hydraulic conductivity, aggregate stability, total organic carbon, organic carbon stocks, organic carbon in aggregate classes and micromorphological analysis of aggregates. It was concluded that: (I) cultivation of the soil increased physical degradation, as evidenced by the reduction of porosity, aggregate stability, saturated soil hydraulic conductivity and increased soil bulk density, (II) the largest carbon stocks were observed in the soil of the secondary atlantic forest (SF) when compared to the soil from the management systems, (III) the conservation management system no-tillage (NT) contributed to the improvement in physical properties and the recovery of organic carbon stocks after about 80 years of agricultural practices, (IV) macroagregates contribute effectively in the organic carbon stocks in soil, showing the highest content of total organic carbon, (V) the microstructural analysis was shown to be sensible among the management systems evaluated, serving as a promising tool for the study of soil aggregation.