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The main objective of this research work was to study the Efficiency Index of Macronutrients in tree biomass in a Mixed Araucaria Forest through 20 primary sample plots of 12 m x 12 m. The efficiency indexes of macronutrients (EIMacronutrients) varied between the tree species, and between the biomass up ground components (stem = wood stem + bark; leaves and total = stem + branch + leaves). The species that showed hight EIMacronutrients to the stem production were the same that showed hight EIMacronutrients to the woody components production (stem + branches), excetp Myrsine ferruginea; Schinus terebinthifolius and Calyptranthes concinna.<p><p>O trabalho aqui apresentado teve como objetivo principal caracterizar o Índice de Eficiência de Macronutrientes (IEMacronutrientes = Biomassa Produzida/Nutriente Utilizado) nos componentes da biomassa acima do solo (DAP ³ 10,0 cm) das espécies arbóreas da Floresta Ombrofila Mista Montana, General Carneiro/PR, utilizando 20 unidades amostrais primárias (UAPs) de 12 m x 12 m. Os índices de eficiência de macronutrientes (IEMacronutrientes) entre as espécies arbóreas, bem como entre os componentes da biomassa acima do solo (fuste = madeira do fuste + casca; folhas e total = fuste + galhos + folhas) variaram. As espécies que apresentaram altos IEMacronutrientes para a produção de fuste foram as mesmas que apresentaram altos IEMacronutrientes para a produção de componentes lenhosos (fuste + galhos), exceto Myrsine ferruginea; Schinus terebinthifolius e Calyptranthes concinna

Índice de eficiência de macronutrientes em espécies arbóreas – floresta ombrófila mista montana/Paraná