engleski

Relationship between diameter increment and damage status of pedunculate oak (Quercus robur L.)

The research of the relationship of diameter increment and the damage status of Slavonian oak (pedunculate oak - Quercus robur L.) was carried out on colour infrared (CIR) aerial photographs (APs) in the famous lowland forests in the Sava Valley. For the assessment of the relationship between the increment and damage status of pedunculate oak, the increment cores were taken on the ground, using colour infrared (CIR) aerial photographs (APs) for the identification of a particular tree. 247 cores were taken. The width of the annual rings in the year of obtaining the colour infrared (CIR) aerial photographs (APs) were measured on the cores and compared with the damage status of particular oak trees. The relationship between 5-years current annual diameter increment (id5) and the damage status at the end of the period was also invetigated. The increased damage of pedunculate oak trees reduces their growth. The diameter increment is a very good indicator of damage status since, even in the case of minor vitality decrease, it is reduced considerably. This was proved by the correlation analysis. The correlation between the damage stage in percentages assessed on color infrared aerial photographs and the width of annual rings in the year in which the aerial photographing was made is very strong (r = -0.9430). The correlation between 5-years current annual diameter increment and the damage stage in percentages at the end of the 5-year period is also strong (r = -0.8475). The damage status was determined along natural and man-made communication lines in the forest. The analysis of stand damage status was performed within 100 and 200 metre zones along linear infrastructures. Along meliorated marches, public roads and channels the damage is high; along natural streams and simple forest roads it is much smaller. These results showed that the stability and health of oak stands are highly dependent on the disturbance of the natural water regime.

pedunculate oak;colour infrared(CIR)aerial photographs(APs);diameter increment;demage status; natural and man-made linear infrastructure

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