DIGITALNA ARHIVA ŠUMARSKOG LISTA
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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 |