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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* https://doi.org/10.31298/sl
upute autorima
WEB EDITION
ARHIVA ČASOPISA


HRČAK


 
EDITORIAL
     
Uredništvo
EMPLOYMENT IN THE FORESTRY SECTOR     pdf     HR     EN 429
 
ORIGINAL SCIENTIFIC PAPERS
     
Nikola PERNAR, Emil KLIMO, Darko BAKŠIĆ, Ivan PERKOVIĆ, Michal RYBNÍČEK, Hanuš VAVRČÍK, Vladimír GRYC UDK 630*114.2 (001)
Carbon and nitrogen accumulation in common Alder forest (Alnus glutinosa Gaertn.) in plain of Drava river     pdf     HR     EN 431
Joso VUKELIĆ, Dario BARIČEVIĆ, Irena ŠAPIĆ UDK 630*188 (001)
Submontane-sub-pannonian beech forests of northern Croatia     pdf     HR     EN 445
Lea BARIĆ, Miljenko ŽUPANIĆ, Milan PERNEK, Danko DIMINIĆ UDK 630*443 (001)
First records of Chalara fraxinea in Croatia – a new agent of ash dieback (Fraxinus spp.)     pdf     HR     EN 461
Vlado GOGLIA, Jozef SUCHOMEL, Josip ŽGELA, Igor ĐUKIĆ UDK 630*302 + 384 (001)
The effectiveness of forest pre-commercial thinning in the context of Directive 2002/44/EC     pdf     HR     EN 471
Igor POLJAK, Marilena IDŽOJTIĆ, Marko ZEBEC, Nikola PERKOVIĆ UDK 630*164 (Castanea sativa Mill.) (001)
The variability of european sweet chestnut (Castanea sativa Mill.) in the region of northwest Croatia according to morphology of fruits     pdf     HR     EN 479
Mile RADOČAJ, Mario BOŽIĆ, Mislav VEDRIŠ UDK 630*569 (001)
Applicability of Vertex telemeter in measuring the structure of montane beech stand using variable probability sampling     pdf     HR     EN 491
Summary: Applicability of ultrasonic telemeter Vertex in inventory of montane beech stand was estimated. Evaluation was based on estimates of structure elements from Bitterlich variable plot sampling, time consumption and costs.
Research was carried out in pure beech stand located near Slunj, in management unit "Mašvina", Forest administration Karlovac, Croatia. Systematic sample of 25 plots was laid on a grid 100 x 100 m. Breast height diameters (DBH) and heights of trees over 10 cm DBH were measured using Variable plot sampling with different metric basal area factors (BAF). Sample trees were selected by Bitterlich stick (BAF 1) and Spiegelrelaskop (BAFs 1, 2 and 4). Distance of borderline trees was checked by Vertex telemeter and measurement tape (BAF 2 and 4). In total, seven combinations of Bitterlich plots (methods) were carried out (Table 1), and circular 20 m radius plots on the same standpoints were set as a reference method.
Diameter distributions estimated from BAFs 1, 2, and 4 were compared to distribution from 20 m radius plots by chi-square test, difference of 0.05 being considered statistically significant. Distributions from BAF 2 and 4 were found to be statistically different (Table 2), with difference mostly coming from number of trees DBHs 10 to 20 cm (Fig. 2).
Number of stems, basal area and volume were calculated for each method per each plot and whole stand (Table 4). All estimates were compared by repeated measures ANOVA with significance level 0,05. No statistically significant differences were found between estimates of N, G and V coming from different methods (Table 5).
Time study and estimation of costs were carried out for measurement methods. Bigger BAFs were found to considerably decrease time (Figure 4) and costs (Table 6), even up to 71 % (BAF 4 vs. BAF 1). Using Vertex instead of measurement tape for checking borderline trees reduced time and costs by 12 % (BAF 4) and 20 % (BAF 2). By economically organizing transport of field crews (two crews using the same vehicle) time and costs were reduced by 8 %.
This research confirmed that cost of forest stand inventory using variable plot sampling can be reduced by use of Vertex telemeter, as well as by choice of appropriate BAFs and economical transport of the field crews.
Key words: Vertex telemeter; Bitterlich sampling; sample plots; costs; forest inventory
 
PRELIMINARY COMMUNICATION
     
Maja JURC, Miloš ČERNÝ, Dušan JURC UDK 630*453
First record of alien pest Ophiomyia kwansonis (Diptera: Agromyzidae) in Europe and its phytosanitary significance     pdf     HR     EN 501

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