Sulphur concentrations in leaves of some forest tree species in Istria and Hrvatsko Primorje [Yugoslavia]
1987
Komlenic, N. | Pezdirc, N. (Sumarski institut, Jastrebarsko (Yugoslavia))
Concentrations of sulphur in assimilation organs of the examined species diffured among each other. The greatest relative content of this element was found in leaves of flowering ash, the lowest in needles of Austrian pine. Concentrations of sulphur differed according to age of the analyzed organs. As young leaves contain a rather high content of this bioelement, they can't be used as control for influence of SO2 on forest trees. For this purpose, we recommend collecting needles after the termination of vegetation period, and leaves of the broad-leaved species before the leaves become yellow. The Austrian pine plantations that were placed up to 10 kn from the SO2 pollution source contained more sulphur in needles than the plantations at over 22 km from the pollutant In the SO2-pollutant environment, serious mechanical damage of the needles and leaves was found in the investigated species. In this respect the pubescent oak exhibited less susceptibility than the examined conifer species and flowering ash. The correlation between the S-concentration determined by the turbidimetric and conductometric methods was practically complete, and the determined differences were statistifically insignificant. The increase in SO2 content in the atmosfere and of S in assimilation organs did not considerably influence the concentrations of the other elements in the plant material.
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