Resumo: O presente estudo teve como objetivo estimar o estoque de biomassa e de nutrientes em um povoamento do híbrido de Eucalyptus urophylla x Eucalyptus grandis, aos 4,5 anos de idade, para isso, foram instaladas aleatoriamente quatro parcelas com dimensões de 21,0 m x 27,5 m. A partir da distribuição diamétrica do povoamento foram determinadas quatro classes de diâmetro e em cada classe foram amostradas três árvores (limite inferior, central e limite superior). Para estimar a biomassa das raízes a coleta foi realizada na área útil das árvores do limite central de cada classe. Após a amostragem e a identificação de cada componente da biomassa, estas foram encaminhadas para o laboratório, onde foram secas, pesadas, moídas e analisadas quimicamente. Os resultados encontrados a partir das análises foram: para a estimativa de biomassa total: 75 Mg ha -1 , com a seguinte proporção: madeira (61,2%), raiz (15,4%), galhos (10,2%), casca (7,7%) e folhas (5,5%). Salientase que a biomassa se encontra predominantemente alocada no fuste (68,9%). Cabe ressaltar que, em média, o acúmulo de nutrientes foi maior na madeira, seguido pelas folhas, raízes, galhos e cascas, apresentando a seguinte magnitude: Ca > K > N > Mg > S > P, com a maior quantidade de Ca alocada no fuste. A partir disso, entende-se que o estoque de nutrientes na biomassa foi elevado em relação ao solo de baixa fertilidade natural.Palavras -chave: Ciclagem de nutrientes; Nutrição florestal; Matéria orgânica. Stock of biomass and nutrient in a stand of hybrid Eucalyptus urophylla x Eucalyptus grandis in Pampa Biome -RSAbstract: This study aimed to estimate the stock of biomass and nutrients in a hybrid stand of Eucalyptus urophylla x Eucalyptus grandis, with 4.5 years old. In order to estimate the biomass, four plots with dimensions of 21.0 m x 27.5 m were randomly allocated. From the diameter distribution of the stand were determined four diameter classes and in each class were sampled three trees (lower, middle and top limits). To estimate the roots biomass, the collection was held in the useful area of the trees of the central limit of each class. After sampling and identification of each biomass component, they were sent to the laboratory where they were dried, weighed, ground and carried the chemical analysis. The estimated total biomass was 75 Mg ha -1 with the following proportions: wood (61.2%), root (15.4%), branches (10.2%), bark (7.7%) and leaves (5.5%). The biomass is predominantly allocated to the stem (68.9%). On average, the accumulation of nutrients was higher in the wood, followed by the leaves, roots, branches and bark. The accumulation of nutrients presented the following scale: Ca > K > N > Mg > S > P, with the higher amount of Ca allocated to the stem. The stock of nutrients in the biomass was high in relation to the low fertility soil.
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