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ŠUMARSKI LIST 7-8/2007 str. 21     <-- 21 -->        PDF

R. Pernar, A. Seletković, M. Ančić: UTVRĐIVANJE OŠTEĆENOSTI ŠUMA SPAČVANSKOG BAZENA ... Šumarski list br. 7–8, CXXXI (2007), 315-332
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oštećenosti hrasta lužnjaka (Q. robur L.) na infra-


SUMMARY: Photointerpretation of colour infrared aerial photographs
(CIR) provides reliable statistical data on forest damage. Inventorying forest
damage with aerial photographs is based on the assessment of the extent of
damage to particular trees (crowns) recorded in aerial photographs. A precondition
for the achievement of such results is a good quality photointerpretation
key. A photointerpretation key was made for the principal tree species
(oak, ash) based on the method of mirroring tree species and damage indicators.
Damage indicators (damage-O, mean damage-SO, damage index-IO,
mean damage1-SO1) were also calculated for each tree species, for all the
interpreted species together, per surveying stripes, for management units, and
for the entire area of the Spačva basin (Forest Administration Vinkovci). CIR
aerial photographs were interpreted to obtain the status of forest stands in the
surveyed area. For the whole study area (5,575 ha), a total of 17,439 trees
were interpreted on the basis of a systematic 100 x 100 m sample. Mean damage
(SO) for all tree species was found to be 26.18 %, for pedunculate oak


31.80 % and for ash 17.93 %. It may be concluded that the degree of damage
of inventoried forests is between low and medium. The considerable damage
index (IO) of 45.27 % for pedunculate oak in the Spačva basin means that the
said percentage of pedunculate oak in the surveyed area is damaged by more
than 25 %. In the entire surveyed area considerable ash damage amounts to
26.15 %. CIR aerial photographs were interpreted in order to assess the condition
of forest stands in the study area. Aerial photographs are a lasting document
of forest stand condition. In aerial photographs observations may be
repeated, checked, updated and continued at any given moment
Key words: colour infrared aerial (CIR) photographs, photointerpretation
key, digital orthophoto (DOP), forest damage, Spačva basin.