Variação de atributos do solo na conversão da floresta primária em seringais em latossolo amarelo na Amazônia ocidental, Manaus-AM.

• Ano de defesa: 2012
• Autor(a) principal: Zaninetti, Rean Augusto
• Orientador(a): Moreira, Adônis
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Amazonas
• Programa de Pós-Graduação: Programa de Pós-graduação em Agronomia Tropical
• Departamento: Faculdade de Ciências Agrárias
• País: BR
• Palavras-chave em Português: Hevea spp.; Matéria orgânica; Biomassa microbiana; Fertilidade do solo; Enzimas do solo
• Palavras-chave em Inglês: Hevea spp.; Organic matter; Microbial biomass; Soil fertility; Soil enzymes
• Área do conhecimento CNPq: CIÊNCIAS AGRÁRIAS: AGRONOMIA
• Link de acesso: http://tede.ufam.edu.br/handle/tede/3052

The cultivation of natural rubber can be an important alternative to planting large tracts of land degraded in the country, as they have good development in Oxisols, accumulating organic matter and improving nutrient cycling. Therefore the objective of this study was to evaluate through chemical and biological soil attributes, the potential of rubber in the balance, in stock and cycling of nutrients. For this, we studied a chronosequence consisting of a primary forest of reference and areas of rubber trees planted 5, 18, 19, 20 and 44 years ago, where it was taken five soil samples in each area, in 0-10 cm, 11-20 cm and 21-40 cm of depth, in this samples were determined the soil fertility, microbial biomass, organic matter fractionation and enzymatic activity. The results showed that removal of the forest resulted in an average reduction of 46% of the stock of organic carbon in soil, with respect to microbial biomass carbon, this reduction was 32%, regardless of age of the plantation. There was a predominance of the humin fraction, followed by humic and fulvic acids and enzyme activity was higher in soil under primary forest. The succession of primary forest to rubber plantations cause an increase in the microbial activity and does not make much change to the soil fertility. After 18 years of the cultivation there is recovery of half of the content of organic soil matter.