Características químicas e frações da matéria orgânica do solo em diferentes distâncias do tronco e de raízes de eucalipto

• Ano de defesa: 2006
• Autor(a) principal: Faria, Geraldo Erli de
• Orientador(a): Barros, Nairam Félix de
• Banca de defesa: Neves, Júlio César Lima , Silva, Ivo Ribeiro da , Venegas, Victor Hugo Alvarez , Martinez, Hermínia Emília Prieto
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Doutorado 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: Fertilidade do solo; Eucalipto; Amostragem
• Palavras-chave em Inglês: Soil fertility; Eucalyptus; Sampling
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO
• Link de acesso: http://locus.ufv.br/handle/123456789/1658

Knowing the spatial variation of soil chemical characteristics is very important to design soil sampling for analyses and for fertilizer recommendation. This research aimed to determine soil chemical variation as affected by the distance from the stem, in both along and between the planting rows, and along roots of different diameters in eucalypt stands 31, 54, and 84 months of age, planted in the Eastern Coastal Region of Brazil. An additional objective was to determine the variation of soil organic matter content as influenced by eucalypt unexcavated old stumps which remained in the area from the previous plantation. Soil samples were collected around trees whose diameter at breast height corresponded to the average of the population and around old stumps, and at the distances of 30, 60, 90, 120, and 150 cm from the tree or stump, both along and between planting rows. The samples were collected at the depths of 0-10, 10-20, and 20-40 cm, in eucalypt stands 31, 54, and 84 months of age. Trenches were excavated to 40 cm depth, close to a tree of mean diameter, to expose root segments, and soil samples were collected cm by cm from the root surface up to 5 cm down from the root. Three root classes were considered: < 2 mm, 2-5 mm, and 5-10 cm diameter. The soil samples were analyzed for pH, P, K, Ca, Mg, Al, and organic matter. The results indicated that: 1) the variation in the soil chemical characteristics was caused by liming and fertilizer applications, suggesting the importance of knowing the management technique applied to the stand before a program of soil sampling is carried out; 2) total soil organic matter increased as the stand aged and when a minimum disturbance is caused to the soil; 3) leaving the slash on soil surface increased the content of the light fraction of organic matter, humic substances and total organic carbon of the soil surface layer.