Produção de biomassa e remoção de nutrientes em povoamentos de Eucalyptus camaldulensis Dehnh, Eucalyptus grandis hill ex Maiden e Eucalyptus torelliana F. Muell, plantados em Anhembí, SP.

The objetive of this work was to study the distribution of biomass and the quantity of storaged nutrients in the different compartments (leaves, branches, bark,  timber) of Eucalyptus camaldulensis Dehnh, Eucalyptus grandis  Hill  ex  Maiden and Eucalyptus torelliana F. Muell tree, with 9,  9 and 12 years old respectively, cultivated in soils with low fertility and sandy texture, in Anhembi - SP. E. grandis showed the highest production of biomass for all the analysed compartiments excepting for thick branches. For the three species the trunk (bark + timber) represented in average 90 % of the biomass above the soil. The nutrients were concentrated in a decreasing way in leaves, branches, bark and timber. The crown of the trees were responsible for the accumulation of nearly 24 % of the nutrients in the total biomass of the trees. In the bark were found the highest quantities of calcium, nearly 60% of the  total. E. grandis removed the highest quantity of nutrients of the soil, returning smaller quantities than the other species. Thus special cares should be taken in order to assure the yield of future.Neste trabalho estudou-se a distribuição de biomassa e a quantidade de nutrientes estocados nos diferentes compartimentos (folhas, ramos, casca e lenho) das árvores de Eucalyptus camaldulensis Dehnh, Eucalyptus grandis Hill ex Maiden e Eucalyptus torelliana F. Muell com 9, 9 e 12 anos de idade, respectivamente, plantados em solos de textura arenosa e baixa fertilidade, em Anhembi - SP. A espécie E. grandis foi a que apresentou a maior produção de biomassa para todos os compartimentos analisados, com exceção dos ramos grossos. Nas três espécies o tronco (casca + lenho) representou em média 90% da biomassa acima do solo. Os nutrientes concentraram-se de forma decrescente nas folhas, ramos, casca e lenho. As copas das árvores foram responsáveis pelo acúmulo de, aproximadamente, 24% dos nutrientes contidos na biomassa total das árvores. Na casca encontram-se as maiores quantidades de cálcio, aproximadamente 60% do total. A espécie E. grandis removeu do solo a maior quantidade de nutrientes, desenvolvendo através da queda de folhedo menores quantidades que as outras espécies. Desta forma cuidados especiais deverão ser dispensados para garantir a produtividade das rotações futuras

CARACTERIZAÇÃO MICROCLIMÁTICA NO INTERIOR DOS TALHÕES DE Eucalyptus camaldulensis Dehnh, Eucalyptus grandis Hill ex Maiden e Eucalyptus torelliana F. Muell, localizado em Anhambi, SP

Neste estudo avaliou-se algumas características microclimáticas em talhões de Eucalyptus camaldulensis, Eucalyptus grandis e Eucalyptus torelliana, resultantes dos diferentes tipos de cobertura florestal que estas espécies propiciam. Das três espécies estudadas, Eucalyptus camaldulensis foi a que deixou passar as maiores quantidades de radiação solar global e intensidade luminosa. Já Eucalyptus torelliana foi a espécie que mais interceptou a radiação solar e deixou o sub-bosque com menos luminosidade. As maiores temperaturas diárias e nos primeiros 10 cm do solo, foram observadas em Eucalyptus camaldulensis. Para as três espécies, aos 20 cm de profundidade a variação da temperatura foi praticamente constante. Através dos resultados encontrados foi possível confirmar que as árvores de Eucalyptus camaldulensis, Eucalyptus grandis e Eucalyptus torelliana, previamente estudadas na Austrália, pertencem, respectivamente, a formação de floresta aberta baixa, floresta aberta alta e floresta fechada

Caracterização microclimática no interior dos talhões de Eucalyptus camaldulensis Dehnh, Eucalyptus grandis Hill ex Maiden e Eucalyptus torelliana F. Muell, localizados em Anhambi, SP.

The objetive of this work was to evaluate some microclimatic    features     in     areas   with Eucalyptus camaldulensis, Eucalyptus grandis and Eucalyptus torelliana, resulting from different kinds of forestal cover that these species provide. From the three  studied species, E. camaldulensis was the one that  allowed  the passage of the highest quantities of global solar  radiation  and  light intensity. E. torelliana was the specie that more intercepted the solar radiation and let the understorey with less luminosity. The highest daily temperatures and in the first 10 cm of soil were observed for E. camaldulensis. For the three species, at 20 cm of depth, the temperature variation was pratically constant. From the results it was possible to confirm that trees of E. camaldulensis, E. grandis, and E. torelliana, studied previously in Australia, belong to the formation of short open forest, tall open forest and closed forest respectively.Neste estudo avaliou-se algumas características microclimáticas em talhões de E. camaldulensis, E. grandis e E. torelliana, resultantes dos diferentes tipos de cobertura florestal que estas espécies propiciam. Das três espécies estudadas, E. camaldulensis foi a que deixou passar as maiores quantidades de radiação solar global e intensidade luminosa. Já E. torellianafoi a espécie que mais interceptou a radiação solar e deixou o sub-bosque com menos luminosidade. As maiores temperaturas diárias e nos primeiros 10 cm do solo, foram observadas em E. camaldulensis. Para as três espécies, aos 20 cm de profundidade a variação da temperatura foi praticamente constante. Através dos resultados encontrados foi possível confirmar que as árvores de E. camaldulensis, E. grandis e E. torelliana, previamente estudadas na Austrália, pertencem, respectivamente, a formação de floresta aberta baixa, floresta aberta alta e floresta fechada

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