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Biomassa e nutrientes removidos no primeiro desbaste de um povoamento de Pinus taeda L. em Cambará do Sul, RS Biomass and removed nutrients in the first thinning of Pinus taeda L. stand in Cambará do Sul, RS

By Márcio Viera, Mauro Valdir Schumacher and Darlan Michel Bonacina

Abstract

Objetivou-se, neste estudo, avaliar a biomassa e a remoção de nutrientes durante o primeiro desbaste de um povoamento de Pinus taeda, com nove anos de idade, em Cambará do Sul-RS. Realizou-se um inventário dendrométrico dos indivíduos que seriam retirados do povoamento no primeiro desbaste. Os indivíduos foram distribuídos em quatro classes diamétricas. Foram abatidos três indivíduos de cada classe e separados acículas, galhos vivos, galhos mortos, casca da madeira comercial, madeira comercial, casca da madeira do ponteiro e madeira do ponteiro. Esses componentes foram amostrados e analisados quanto aos teores de macro e micronutrientes. A biomassa resultante do primeiro desbaste foi de 35,7 Mg ha-1, com a seguinte magnitude de distribuição: madeira comercial > galhos vivos > casca contida na madeira comercial > acículas > madeira do ponteiro > galhos mortos > casca do ponteiro. As acículas apresentaram os maiores teores de macronutrientes e, juntamente com a casca do ponteiro, apresentaram também os maiores de micronutrientes. A colheita da casca e de madeira comercial resultou na seguinte remoção de macronutrientes, em kg ha-1: 46,2 de N; 25,1 de Ca; 15,2 de K; 10,0 de S; 6,7 de Mg e 5,4 de P; e de micronutrientes, em g ha-1: 2.641 de Mn; 1026 de Fe; 240 de Zn; 234 de B e 66 de Cu.<br>The objective of this study was to quantify the biomass and removal of nutrients in the first thinning of Pinus taeda stand at nine years of age in Cambará do Sul-RS. A forest inventory of the individuals that would be removed from the stand in the first thinning was done. The individuals were distributed in four diametric classes. Three individuals in each class were cut off and needles, live branches, dead branches, bark from the commercial wood, commercial wood, bark from the top wood and top wood were separated. These components were sampled and analyzed for contents of macro and micronutrients. The biomass resulting from the first thinning was 35.7 Mg ha-1, with the following magnitude distribution: commercial wood > live branches > bark in commercial wood > needles > top wood > dead branches > bark from the top wood. The needles presented the greatest concentration of macronutrients, which together with the bark from the top wood, also show the greatest amount of micronutrients. Harvest of bark and commercial wood in the first thinning resulted in the following removal of macronutrients: 46.2 kg ha-1 of N, 25.1 kg ha-1 of Ca, 15.2 kg ha-1 of K, 10.0 kg ha-1 of S, 6.7 kg ha-1 of Mg and 5.4 kg ha-1 of P, and for micronutrients, the values were: 2,641 g ha-1 of Mn, 1,026 g ha-1 of Fe, 240 g ha-1 of Zn, 234 g ha-1 of B and 66 g ha-1 of Cu

Topics: Nutrição florestal, Exploração florestal, Pinus taeda, Forest nutrition, forest exploration, Pinus taeda, LCC:Forestry, LCC:SD1-669.5, LCC:Agriculture, LCC:S, DOAJ:Forestry, DOAJ:Agriculture and Food Sciences
Publisher: Sociedade de Investigações Florestais
Year: 2011
DOI identifier: 10.1590/S0100-67622011000300001
OAI identifier: oai:doaj.org/article:e353a069a1744577af219045346656b8
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