Estoque de carbono em ?rea de recomposi??o florestal com diferentes espa?amentos de plantio

• Ano de defesa: 2010
• Autor(a) principal: Lisboa, Alysson Canabrava
• Orientador(a): Leles, Paulo Sergio dos Santos
• Banca de defesa: Resende, Alexander Silva de, Valcarcel, Ricardo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal Rural do Rio de Janeiro
• Programa de Pós-Graduação: Programa de P?s-Gradua??o em Ci?ncias Ambientais e Florestais
• Departamento: Instituto de Florestas
• País: Brasil
• Palavras-chave em Português: Reflorestamento; espa?amento; carbono
• Palavras-chave em Inglês: Reforestation; spacing; carbon
• Área do conhecimento CNPq: Recursos Florestais e Engenharia Florestal
• Link de acesso: https://tede.ufrrj.br/jspui/handle/jspui/4102

The aim of this study was to determine the biomass and organic carbon sequestration in forest species, litter (organic matter) and soil in mixed forest stand in different planting spacing for subsequent reforestation. The spacings were: 1.0 x 1.0, 1.5 x 1.5, 2.0 x 2.0, 3.0 x 2.0 with an area of 1.700, 1.700, 3.300 and 3.300 m? respectively. The number of species established for the implementation of reforestation was 45 species for all spacings. A census was realized at 4 years after planting for determination of organic carbon and biomass of plants, measuring the CNS (circumference at ground level) of plant at which one plant with CNS average was selected for each species. The selected plants were cut down and separated their components (roots, wood, bark, twigs and leaves), weighed and removed samples to determine dry weight. For quantification of carbon storage, it has been selected 12 species that showed better growth, removed samples of their components that were milled and taken to the laboratory for determining the organic carbon content. Samples were taken for the quantification of soil organic carbon at five points in each spacing in the soil layers 0-5, 5-10, 10-20, 20-30 and 30-50 cm. The spacing 1.0 x 1.0, 1.5 x 1.5, 2.0 x 2.0 and 3.0 x 2.0 m showed accumulation of biomass of 70.33, 41.48, 42.13 and 44.61 Mg.ha-1, respectively. The accumulation of biomass in the species studied ranged from 0.405 to 83.900 kg.plant-1. The plants of species Melia azedarach, Acacia polyphila, Schyzolobium parahyba and Cordia superba showed the highest value, Schinus terenbinthifolius, Inga sp., Lafoensia glyptocarpa and Anadenanthera colubrina the lowest biomass. The spacing (1.0 x 1.0 m) showed the greatest accumulation of litter (7.03 Mg ha-1) and the spacing (3.0 x 2.0 m), the smallest value (3.15 Mg ha-1). The spacing did not affect the carbon content which varied between 26.03% and 37.14%. The highest and lowest average of carbon stored was found in Cordia trichotoma and A. colubrina with 48.8% and 43.8% respectively. Among the components of the selected species for determination of organic carbon, the bark of Chorisia speciosa presented content of 41.4% and wood of Inga sp. 55.6%, the first was the lowest values found and the second, the highest value. The largest amount of accumulated carbon was found in Cordia superba on the spacing 3.0 x 2.0 m and the smallest value in A. colubrina on the spacing 1.0 x 1.0 m. The planting space 1.0 x 1.0 and 1.5 x 1.5 m showed higher carbon content in the soil instead of spacing 2.0 x 2.0 and 3.0 x 2.0 m to forest stands with up to 4 years old.