R ESU M OAs atividades de mineração e de viticultura do Rio Grande do Sul têm contribuído para a contaminação do solo por cobre. Este trabalho objetivou avaliar o efeito de doses de cobre no crescimento e na qualidade de mudas de timbó (Ateleia glazioviana) e dedaleiro (Lafoensia pacari). O delineamento foi inteiramente casualizado em arranjo fatorial (2 x 4), formado de duas espécies florestais e quatro doses de cobre (0, 64, 128 e 192 mg kg -1 de solo) com cinco repetições. Avaliaram-se altura da planta, diâmetro do colo, peso da matéria seca radicular e da parte aérea, comprimento e área superficial específica radicular e os seguintes índices de qualidade de mudas: relação entre altura da parte aérea e diâmetro do coleto; altura da parte aérea e peso da matéria seca da parte aérea e o índice de qualidade de Dickson, em que os resultados revelaram que as doses de cobre testada reduziram a qualidade de mudas do timbó enquanto o dedaleiro apresentou melhor qualidade com 128 mg kg -1 de Cu. O cobre influenciou os parâmetros de crescimento das mudas de timbó porém aumentou significativamente o comprimento e a área superficial específica do dedaleiro até 128 mg kg -1 de Cu. Mudas de dedaleiro são mais tolerantes à contaminação do solo que as de timbó e apresentam melhor qualidade em doses mais elevadas de cobre. Palavras-chave: espécies florestais, metal pesado, tolerânciaGrowth and quality of Ateleia glazioviana and Lafoensia pacari seedlings cultivated in copper contaminated soil A B ST R A C T The mining and viticulture activities in the State of Rio Grande do Sul, Brazil have contributed to soil contamination by copper. The aim of this study was to evaluate the effect of copper doses on growth and quality of Ateleia glazioviana and Lafoensia pacari seedlings. The experimental design was completely randomized in a factorial scheme (2 x 4) with five replications. The experiment involved two forest species and three copper doses (64, 128 and 192 mg kg -1 ). The plant height, stem diameter, root and shoot dry-mass, length and specific superficial area of roots, as well as seedlings quality index: relationship between shoot height and stem diameter, shoot height and dry-mass of shoots were evaluated. In addition, Dickson's quality index was estimated. The results showed that the tested copper doses reduce the quality of seedlings of Ateleia glazioviana; however, the Lafoensia pacari quality was better with Cu dose of 128 mg kg -1 . Dose of copper influenced the growth of Ateleia glazioviana seedlings, but increased significantly the length and specific surface area of the Lafoensia pacari up to Cu dose of 128 mg kg -1 . Lafoensia pacari seedlings are more tolerant to soil contamination than Ateleia glazioviana and display better quality of seedlings at high copper doses.
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