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ŠUMARSKI LIST 11-12/2006 str. 35     <-- 35 -->        PDF

J. Roša: TANINI I MIKROELEMENTI U STANICAMA IGLICA OBIČNE JELE (Abies alba Mill.) ... Šumarski list br. 11–12, CXXX (2006), 493-509
clides 7Be 137Cs and 40K were determined on the same sample by the method of
gamma spectrometry.


The results collected were statistically processed by the computer program
STATISTICA 6.0.


The analysis of the structure of tannins in fir-tree needles (Abies alba Mill.)
showed the existence of significant differences between the sites of Risnjak and
Donja Dobra. The changes in the tannin structure on Risnjak location were
visible earlier than the ones on the Donja Dobra location, i.e. already in May.
The biggest changes of the tannin structure were found in the epidermis, hypodermis
and also in the mezzophyll and the central rib (xylem and phloem). A
positive correlation between the site and stage of damage of the needles was
established. The structural changes of the tannin are evident with the increase
of the stage of needle damage. The differences are less significant between the
years and the periods of sample on the individual locations.


The concentrations of microelements in the fir needles on Risnjak location
statistically significantly differ from the one of the Donja Dobra location. All
measured concentrations of the elements show higher values in the samples
from the Donja Dobra location. The increase of Zn, Cu and Cr was by 1.2 times;
Fe and Pb increased by 1.4 times, while the respective values of Ca and
Rb were higher by 1.6 and 1.7 times. The biggest increase was found with
Sr (4.2 times) and Mn (14.2 times). It can be concluded that the concentrations
of manganese and strontium are best indicators for the degree of crown
damage. The concentration of nutritive elements decreases proportionally
with the increase of crown damage on Risnjak location. This correlation is
mostly supported by Mn, Sr, Fe and Ca.


The concentration of the measured microelements in honeydew honey on
both locations is approximately equal. The concentration of Pb and Cu is
slightly bigger in the sample from the Risnjak location, but the concentration
of other measured elements (Cr, Fe, Ni and Zn) is slightly bigger on the location
Donja Dobra.


Based on the research, we can conclude that the tannins are good indicators
for the observation of tree needles. Their morphological characteristics
are correlated with the concentration of microelements and the stage of tree
damage. The concentration of the microelements in honeydew honey did not
show any significant differences between the different locations.