Utjecaj svojstava tla na kemijski sastav lisca nekih vrsta hrastova.
1984
Spirovski J.
The chemical composition of leaves of three oak species:Quercus coccifera L, Q. lanuginosa Thuill. and Q. conferta Kit. from various areas of SR Macedonia and from various types of soil was investigated in order to determine the share of some mineral fertilizers and microelements. Leaves were gathered in the 1st half of December 1976. The trees from which leaves were taken were growing on these types of soil:cinnamon-coloured forest soil, smonitsa (chernozem-smonitsa), humus-carbonatic and brown forest soil. The obtained results show the following: The elements which soil contains the most (Si,Al,Fe) participate in the circulation to the smallest extent. Aluminium and iron are found in the leaves only in parts of percentages. The quantity of silicium in the leaves of Q. coccifera L. is small, while in the other 2 species it is notably larger (3-5.5%), but still much smaller than in the soil. The mobility of soil alkali elements is high, so there are much more of them in all 3 oak species then the former ones (Al, Si, Fe), although their quantity in the soil is smaller. Ca is more mobile than Mg. Phosphorus and sometimes nitrogen too (as an element, not as an oxide) are present in the leaves in full percentages. K, Mn, Na and S participate less in the matter circulation. Their summary circulation is the most intensive in Q. lanuginosa, less in Q. conferta and the least intensive in Q. coccifera L. There is more Cu, B, Zn and Co in the leaves, than in their mobile form in the soil.
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