Biomassa e nutrientes no corte raso de um povoamento de Pinus taeda L. de 27 anos de idade em Cambará do Sul - RS
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Data
2013-06
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This study was conducted in a 27 year Pinus taeda stand in Cambará do Sul, Rio Grande do Sul state and
aimed to estimate the biomass production, nutrient stock and to evaluate the nutritional impact in different
forest harvesting intensities. Biomass was estimated through regression equation adjustments, with the cut
of 15 trees distributed in 5 diametric classes. Nutrients stock was obtained through the product between the
average content of nutrients in each biomass component and the number of trees per diametric class per
hectare. Pinus taeda above ground biomass was estimated in 266.08 Mg ha -1 , being 69.1 % of wood, 17.1 of
live branches, 6.7 % of bark, 3.8 % of dead branches and 3.4 % of needles. Nutrients stock in biomass
(kg ha -1 ) was estimated in: 511.96 of N, 44.39 of P, 174.27 of K, 310.77 of Ca, 103.80 of Mg, 115.36 of S,
2.94 of B, 0.62 of Cu, 17.34 of Fe, 36.70 of Mn and 4.46 of Zn. Nutrients stock relative distribution in Pinus
taeda biomass components showed the following sequence: wood (43.6 %), live branches (24.8 %), needles
(19.0 %), bark (8.7 %) and dead branches (3.9 %). Total above ground biomass harvest, when compared to only wood removal, leads to nutrients export increase that can vary from 58.0 % to 127.4 %, depending on
the chemical element, while biomass removal increases 40.8 %.
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Colheita florestal, Sustentabilidade, Produtividade, Ciclagem de nutrientes, Forest harvesting, Nutrient cycling, Productivity, Sustainability
Citação
SCHUMACHER, Mauro Valdir; WITSCHORECK, Rudi; CALIL, Francine Neves; LOPES, Vicente Guilherme. Biomassa e nutrientes no corte raso de um povoamento de Pinus taeda L. de 27 anos de idade em Cambará do Sul - RS. Ciência Florestal, Santa Maria, v. 23, n. 2, p. 321-332, abr./jun. 2013.