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T. Pcnlek. I). Pieman. II. Nevečcrcl: SREDNJA UDALJENOST PR1VLAČKNJA DRVA _ Šumarski list br. 9 10. CXXVI1I (2004). 545-558 Dobre , A., 1990: Nekateri dejavniki odpiranja gozd-izgradnje optimalne mreže šumskih prometnica, nega prostora - Raziskovalna naloga, Institut za Disertacija, Šumarski fakultet Sveučilišta u Zagozdno in lesno gospodarstvo pri Biotehniški fagrebu, str. 1-112. kulteti v Ljubljani, Ljubljana, str. 1-138. Pičman , D. & I. Tomaz , 1995: Određivanje težišta FAO, 1974a: Logging and log transport in man-made odjela primjenom osobnih računala u svrhu izraforests in developing countries, FAO/SWE/TF čunavanja srednje udaljenosti privlačenja, Šu116, Rome. marski list 3, Zagreb, str. 91-103. FAO, 1974b: Logging and log transport in tropical Pičman, D., T. Pentek&M. Družić, 1997: Utjehigh forest, FAO Forestry Development Paper caj troškova izgradnje i održavanja šumskih cesNo. 18, Rome. ta na njihovu optimalnu gustoću u nizinskim šu mama Hrvatske, Mehanizacija šumarstva 22 (2), Habsburg , U., 1970: Sind Knickschlepper und Zagreb, Hrvatska, str. 95-101. Forststrassen Gegensätze? Betrachtungen über den Einfluss der Rückemethoden auf den We-Pičman , D. &T. Pentck , 1998: Relativna otvoregeabstand. Allgemine Forstzeitung. nost šumskog područja i njena primjena pri iz Jeličić , V., 1983: Šumske ceste i putevi, SIZ odgoja i gradnji šumskih protupožarnih prometnica, Šumarski list CXXII (1-2), Zagreb, Hrvatska, str. usmjerenog obrazovanja šumarstva i drvne in19- 30. dustrije SRH, Zagreb, str 1-193. Pičman, D. &T. Pentek, 1998: Određivanje sred Jeličić , V., 1988: Otvaranje šuma i suvremeni trannje udaljenosti privlačenja težišnom metodom sport drveta, Jugoslovenski poljoprivredno šumarski centar - služba šumske proizvodnje, primjenom osobnog računala, Šumarski list CXXII (9-10), Zagreb, Hrvatska, str. 423-435. Beograd, br. 88, str. 1-61. Rebula , E., 1980: Prispevek k opredeljevanju opti Martinić, I. 1996: Doktorski rad malne gostote omrežja gozdnih čest, Gozdarski Fabijanić, G., Š. Meštrović, 1995: Priručnik za vestnik 9, Ljubljana, str. 372-395 uređivanje šuma, Zagreb, str. 1-416. Sanktjohanser, L., 1971: Zur Frage der optimalen Piest , K., 1974: Einfusse auf Walderschlicssung und Wegendichte in Gabirgswaldungen. Forstwissen Wegegestaltung. Forsttecchnische Informatio schaftliches Centralblatt, Nr. 3. p. 142-153. nen, Nr. 3, p. 27-30. Segebaden , von G., 1964: Studies of cross-country Pen tek, T., 2002: Računalni modeli optimizacije transport distances and road net extension, Stu mreže šumskih cesta s obzirom na dominantne dia Forestalia Suecica No. 18. utjecajne čimbenike, Šumarski fakultet Sveučilišta u Zagrebu, Disertacija, str. 1-271. Šikić , D. i drugi 1989: Tehnički uvjeti za gospodarske ceste, Znanstveni savjet za promet JAZU, Pičman , D., 1993: Utjecaj konfiguracije terena i hi- Zagreb, str. 1 —40. drografskih prilika na ekonomsku opravdanost SUMMARY: Decreasing the mean wood skidding distance is one of the basic tasks of building forest roads in economic forests. Classical forest openness expressed in km/1000 ha, gets its real significance and actual situation regarding the forest road network quality only if it is shown in the combination with the mean skidding distance. The relative forest openness in combination with the method of bordered area also uses the mean skidding distance as one of the most important input data. What is a mean skidding distance, which types of mean skidding distances exist, how are they determined and calculated, in what way we can transform one type of mean skidding distance into another and which correction factors are used in this are only a few questions to which you can find the answer in this paper. The calculation of the optimum forest openness, as well as the calculation of the optimum mean skidding distance are based on mathematical models and once obtained values are correct, as long as the input calculation parameters are the same. Can the results of the optimum openness calculation according to mathematical models, which are based on the minimum total cost of wood skidding, be manipulated, are they extendible within determined firm boundaries and is such a starting point in a forest opening by forest roads and the total forest road network optimisation acceptable ? The paper introduces the use of the aimed wood mean skidding distance. Key wo rds: forest roads, opening up of forests, optimum opennes, mean skidding distance, correction factors |