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ŠUMARSKI LIST 11-12/2002 str. 40     <-- 40 -->        PDF

I. Anić, M. Organic, M. Delelić: REVITALIZACIJA DEGRAD1RANOGA EKOSUSTAVA NAKON SUŠENJA ... Šumarski list br. 11-12, CXXVI (2002), 575-587
Tiefenbacher, H., 1996: Silvicultural planning Vranković, A., F. Bašić, 1989: Neki rezultati peunder
conditions of environmental change: doloških istraživanja u poremećenim ekosisteevaluation
of options in a dieback in Austrian mima hrasta lužnjaka u Hrvatskoj. Glas. šumske
oak forests. Forest Ecology and Management, pokuse 25: 25-52, Zagreb.


83:
133-136. Žalac , T., 2002: Šumsko-uzgojne značajke sastojine
Vär ally ay, G.,
1989: Climate change and soil prohrasta
lužnjaka podignute sadnjom na nasipe.
cesses. U: M. Maceljski (ur.), Prilagodba poljoDiplomski
rad, Šumarski fakultet, 31 str.,
privrede i šumarstva klimi i njenim promjenaZagreb.
ma. HAZU, 5-16, Zagreb.


SUMMARY: The research deals with the structure of stands established


over a degraded site after a catastrophic dieback of pedunculate oak stands


in the forest of Kalje in the period 1983 - 1986. It is aimed at investigating


a) the structural properties of new stands established with rehabilitation


treatments following the dieback of pedunculate oak stands, b) some possible


impacts of dieback intensities informer stands on the structural properties of


newly-established stands, c) the role of narrow-leaved ash in revitalising


degrades sites. Research was conducted in experimental plots set up in the
forest of Kalje in 1986, at the beginning of investigation of dieback causes
and effects. The paper compares the results of 1986 and 1999.


The plots were arranged by dieback intensities informer oak stands starting
from low towards high intensity, or from Plot 1 to Plot 10. All experimental
plots are 200 m2 in size and are distributed in the form of 100 m-long and
2 m-wide strips. All woody species in the plots were measured. If their breast
diameters were less than 3 cm, they were classified (in terms of height) into
height classes 25 cm wide. Three mean basal area trees were cut in each plot,
and their age was determined and growth and increment analysed. All data
were inserted into field manuals, while experimental plot positions were
drawn into the Management Unit map. The average heights were calculated


from height distributions of narrow-leaved ash, black alder and pedunculate
oak. In order to have better perception of the extent of dieback in former
pedunculate stands in the forest of Kalje, dieback intensities were analysed in
selected compartments, in which experimental plots were established after
the silvicultural procedure of restoration.


The canopy opening in the stands of pedunculate oak ensuing from extensive
dieback in the 80s had the character of preparatory or seeding cut. The
highest dieback intensities were characterised by an almost complete canopy
opening and even by the final cut in some places. Abrupt light caused the soil
to become weed-covered and swampy in places, with all the consequences
mentioned in the introductory chapter. Silvicultural treatments of restoring
the effects of dieback and gradually rehabilitating the degraded site included:


-
preparing the site (draining stagnant water, removing weeds, loosening
the soil, installing pipe drainage in the road to enable undisturbed circulation
of flood water),
-
tending the natural young growth occurring under the crown canopy during
dieback and restoration (removing weeds, shrubs and advance regeneration,
protection from game),
artificial regeneration by planting seedlings of pioneer tree species and


removing dry oaks with the final cuts.


The treatments were applied simultaneously in small areas within the
same compartment. This required drawing detailed silvicultural plans with
maps and schemes on a scale 1:5,000 or 1:10,000. The stand form was converted
(substitution): oak stands were replaced with ash stands complement