CONCENTRATIONS OF HEAVY METALS IN MOEHRINGIA TRINERVIA (CARYOPHYLLACEAE) IN THE NIEPOLOMICE FOREST (S POLAND) - CHANGES FROM 1984 TO 1999

摘要

The Puszcza Niepofomicka forest is a large forest complex which has been affected by pollution from the big urban-industrial agglomeration of Krakow for over 50 years, Moehringia trinervia (L.) Clairv., a species commonly occurring in the forest, wasused in a 1984 study assessing heavy metals contamination. After a lapse of 15 years the study was repeated in 1999. Samples of M. trinervia were collected once more, and concentrations of the same elements (Cd, Pb, Zn, Cu) were determined in the plant.The concentrations of Cd and Cu in the plant material collected in 1999 were lower than in the 1984 samples, and the differences were statistically significant (Cd in 1984, 6,85 to 16.14 mug g~(-1); Cd in 1999, 1.31 to 14,34 mug g~(-1). The zinc concentration also differed from its natural level in Moehringia trinervia (Zn in 1984, 241.4 to 457.1 mug g~(-1); Zn in 1999, 203 to 428 ug g~(-1)). The concentrations of all studied elements differed between sampling sites. Just as in 1984, the western part ofthe forest (situated closest to the town and the steelworks) was most contaminated with heavy metals,