摘要：

In soil samples taken from 18 soil profiles situated in the umava region on both forest and adjacent meadow stands, total content of Al in 1M KCl extract and labile forms of Al were determined. Al bound in organic complexes was determined in 0.05M Na4P2O7 extract. Basic soil characteristics were also determined. Multiple analysis of variation of particular Al forms showed that the greatest differences resulted from the differences in soil cover. The content of exchangeable Al, both total and labile, was significantly higher in forest soils than in grassland soils. The content of labile Al in 1M KCl extract was in close correlation with the total exchangeable Al, the content of Al extracted by 0.05M Na4P2O7 was not significantly correlated to exchangeable forms. In factor analysis, two common factors were selected explaining more than 75% of the total variation. According to weights distribution among all variables it was possible to describe the first factor as a factor of soil reaction showing significant influence on the content of exchangeable forms of Al in soil. The second factor was described as a factor of soil organic matter.

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