broj: 11-12/2002        pdf (28,5 MB)


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Znanstveno-stručno i staleško glasilo
Hrvatskoga šumarskoga društva
Journal of Forestry Society of Croatia
      Prvi puta izašao 1877. godine i neprekidno izlazi do današnjeg dana
   ISSN No.: 0373-1332              UDC 630*
upute autorima


Krpan, A. P. B., Poršinsky, T. UDK 630* 360 + 662 (001)
The Productivity of Timberjack 1070 Harvester in Scotch Pine thinning     pdf     HR     EN 551
Vučetić, M. UDK 630* 111 + 431 (001)
Weather Conditions and Comparison of the Forest Fire Season 2001 With the Long-term Mean Values     pdf     HR     EN 563
Summary: A map presentation of mean long-term (1961-1990) seasonal severity ratings (SSR) has been made for the first time for Croatia, at risk of forest fires in the warm part of the year. The obtained mean status can be used for comparing the success of seasonal forest fire protection measures, or the impact of weather factors on the success/failure of protection. According to the map, on average the most endangered area is that from Šibenik to Ploče with the adjacent islands and the hinterland. High values also occur approximately up to the northern boundary of Dalmatia, and inland in the wider Knin area. It was found that the SSR values for Senj, due to the particular feature of the wind regime, do not represent wider surroundings. Based on the justifiable assumption that there are more such areas, further research will be made aimed at obtaining a veritable presentation of fire severity.The first comparison of the SSR with the long-term mean values was made for the season 2001. The analysis shows that during the season June-September 2001, there were fundamental changes in the sense of increased SSR values above the average, primarily in the continental part of Central Dalmatia (Knin and Split hinterland) and in the wider surroundings of Šibenik and Ploče. Decreased SSR values on the Central Dalmatian islands do not indicate the expected absence of forest fires in this area. The reason for this is the mean value for the period which is too long (June-September). Consequently, in further analysis attention will be focused on shorter periods, the Monthly Severity Rating.
The analysis of weather conditions during the season show that August was the driest month and September the rainiest. Low precipitation quantities occasionally prevented the occurrence of long precipitation-free periods. The longest precipitation-free periods occur at the end of July and last until before the end of August. This is the most critical period of this season, especially just before its end, for the occurrence and spread of forest fires. The biggest changes of wind conditions along the coast, the hinterland and islands are seen during August. As most forest fires erupted in this month and caused the largest burned areas, it can be concluded that one of the basic weather factors for forest fires, along with dry periods, is the change in the wind regime. According to the ISI (Initial Spread Index) and FWI (Fire Weather Index) indicators, there were several critical periods, but 11 and 12 August feature prominently. Under the conditions of ISI 3 18 and FWI 3 34, which were fulfilled especially in the second half of August, forest fires could assume all the characteristics of crown fires.
The presented analysis indicates that during the observed year of 2001 (the June-September season) the major part of the observed area (except for Central Dalmatian islands) provided more than average favourable conditions for the occurrence and spread of forest fires. It was in August in particular that weather conditions were conducive to the occurrence of the worst form of forest fires, the crown fire.

Key words: crown fire; fire weather index; forest fire; long-term mean values of seasonal severity rating
Anić, I., Oršanić, M., Detelić, M. UDK 630* 429 + 231
The Revitalisation of Degraded Forest Ecosystem After the Dieback of Pedunculate Oak - a Case Study in the Kalje Forest     pdf     HR     EN 575
Frković, A. UDK 630* 156
On Croatian Deer Antlers     pdf     HR     EN 589
Starčević, T., Dundović, J., Knepr, J. UDK 630* 156 + 180
Forest Ecosystems Under the Circumstances of Separated Managements of Forests and Hunting Areas     pdf     HR     EN 595
Majnarić, D. UDK 630* 156
Bear Management as a Task of State Forestry     pdf     HR     EN 601
Raguž, D., Grubešić, M., Starčević, T. UDK 630* 156 + 945
The Tradition of Educating Forestry Personnel for the Needs of Hunting Management in the Republic of Croatia     pdf     HR     EN 613
Vratarić, P., Tarnaj, I. UDK 630* 156 + 135
Hunting Management in State Forests as Key Factor in the Transfer of Red Deer (Cervus elaphus) and Wild Boar (Sus scrofa) Breeding Stock     pdf     HR     EN 617
Križaj, D., Vodolšak, M. UDK 630* 156 + 931
Legal Provisions Regulating Game Loss and Damage from Game, and Protection Measures     pdf     HR     EN 623

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