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
i 1 r = correlation coefficient x. = the corresponding number of the first series y. - the corresponding number of the second series n = the number of the members of the. series The value of the correlation coefficient can vary between -1 and > 1. If - 0.5 r - 1 or 0.5 r +1 then we can speak of a correlation between the two series. Naturally, the better the value of r nears -1 or +1, the stronger the relation is between the two series. In course of the correlation calculations the quantity of Mn, Zn, Cu and Pb measured in the plants was compared to that of the quantity of the corresponding soluble trace element content measured in the A, B, C soil levels, as well as the avarage quantity of the soluble trace elements in the whole soil section (Table 3). For the sake of a better comparison, the individual values are demonstrated here on diagrams as well (Figs 2-5). Evaluating the results, we can conclude the followings. Among the four trace elements investigated, the quantity of manganese occurring in plants and that of the soluble manganese content of the soil are not in correlation with each other. Only n very slight correlation of the manganese content of the soil level B and that of the plants could be seen, but irrespective of this we can state that there is no significant connection between the Mn accumulate-' in Dactylis glome rata L. and that of the Mn content soluble from the soil. We can possibly explain it by the fact that the Mn accumulated in the Dactylis glomerata is one order of degree smaller than the amount in the soil, thus it is very probable that in the uptake of this element the role of the amount soluble from the soil is insignificant. The quantity of zinc accumulated in the Dactylis glomerata is seemingly in strong correlation with the soluble zinc content of the top soil layers (A) especially. Copper is the very element where the samples from all soil levels are more or less in correlation with the quantity measured in the Dactylis gl omerata . The connection is seemingly somewhat stronger in the upper soil level than in the lower ones. The correlation coefficient is relatively high in respect of the average trace element content soluble from the soils. It is remarkable that the correlation was negative in all cases, that is, the higher the soluble Cu content of the soil was, the less we found in Dactylis glomerata . The quantity of lead found in Dactylis glomerata is first of all in very strong correlation with the soluble lead content of the lower soil layers (B, C), thus from this respect it acts contrary to zinc. The amount of lead in plants is also in good correlation with the average lead content soluble from the whole soil section. S I'M M AK Y Summing up we can state that the amount of the different trace elements taken up by plants and that of the soluble corresponding trace element content of the soil are generally in close connection. In case of manganese, however, we have seen that it is not always so. Another important
