L. Hably szerk.: Studia Botanica Hungarica 19. 1986 (Budapest, 1986)
Szakmány, György: Investigations on the trace element geochemical interaction between soil and vegetation: concentration of manganese, zinc, copper and lead in the soil and in Dactylis glomerata L
AREA, SAMPLING AND EXPERIMENTAL The territory investigated is situated in the vicinity of MezÖnagymihály, NE Hungary. Some soil sections were deepened here (Fig. 11 and analysed in details (SZAKMÁNY in press). Among the soil sections, there were four with humic washlands (sections 24, 25, 27, 281 while one was nf meadow washland type (section 29). We sampled the vegetation in the immediate neignbourho&d of the soil sections, that was composed of, prevailingly, from D actylis gi ome rata L ., thus we chose this species as a subject for our studies. The total content of Mn, Zn, Cu, and Pb of the plants as well as that of the soluble trace element quantity of the soil were measured by atomic absorption spectrophotometry. As the expérimentais for preparing the soil samples and the evaluation of the data have been already published in a previous study (SZAKMÁNY in press), thus we concentrate on the data relevant to this present study only (Table 11. In course of the preparation of the piant samples the specimens were washed in dis^ tilled water, dried in a desiccator on 105 C°, then ground, and an amount of l.OOù g apportioned for analysis. This was evaporated with 15 ml of concentrated nitric acid on sand bath. After the complete evaporation, 5 ml of concentrated nitric acid and 5 ml of concentrated hydrogène peroxide was added to it, and the evaporation repeated. The operation was performed two times more, and the last distillate was solved in 5 ml of concentrated nitric acid by moderate heating and poured into retorts, and completed to 25 mi with tridistilled water. On the plant samples prepared this way we measured the quantity of Mn, Zn, Cu and Pb. The trace element content of the plant samples are presented on Table 2. j road « railway 'stream sampling 3 km THE RESULTS OF THE MEASUREMENTS site Fig. Location of the area and the sampling sites As a result of the atomic absorption analyses it was found that the trace element content of the Dactylis g lo merata L . sampled on the territory was relatively constant in case of the sections near the humic washland soil (24,25,27,28). Near the meadow washland soil section (29), the quantity of Zn, Cu and Pb is somewhat higher. A possible explanation for this might be that in the upper level of this soil the pH is relatively low (6 pH), promoting a better solution for certain trace elements as well as their better absorbtion (REDOY & PATRICK 1977, JACKSON & SKIPPEN 1978), while the soil of the more humic sections is of higher pH in its upper levels (about 6.5-7.5 pH). The manganese content of the plant samples is about one order of degree lower than the quantity of Mn soluble from the soil. The concentration of Zn, Cu and Pb is approximately equal to that of the soluble trace element content in the deeper soil levels (Levels B and C).
