In order to evaluate the influence of an intensive forestry on the monomeric aluminium and organic matter release by the Limousin forest (France), an acidic brown earth soil planted with 3 different forests (centenary Douglas, young Douglas and Chesnuts) was selected. According to batch reactor experiments, the results show that all A horizons the most contaminated distilled water with monomeric aluminium and organic matter. The higher released concentrations of monomeric aluminium were obtained with the old Douglas upper soil horizon. When the soil was in contact with acidic solution, the more the pH was acidic, the more monomeric aluminium released concentration was important.

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