DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 10-12/1977 str. 36 <-- 36 --> PDF |
po stablu (uključujući predahe, prelaske od stabla do stabla i ostale pripreme). Grane su se rezale ručno pomoću voćarske pile, a za veće visine koristile su se švedske ljetve. Ovaj utrošak vremena je veoma mali, gotovo zanemarljiv u poređenju sa povećanjem vrijednosti proizvedene drvne mase. Na stablima na kojima su se rezale grane ovo povećanje vrijednosti može biti oko 15 puta veće u odnosu na troškove rezanja grana, a kod običnog bora najvrijedniji sortimenti mogu biti i preko 10 puta skuplji u odnosu na prosječni trupac za rezanje. LITERATURA Heger , A. (1955): Lehrbuch der forstlichen Vorratspflege. Hilf, H. H. (1967): Der Einfluss gesetzmässiger Entwicklung der Verwertung des Nadelrundholzes auf die künftige Zielsetzung bei waldbaulichen Massnahmen insbesondere im Mitteleuropa. XIV IUFRO-Kongres, sekcija 23. str. 299, München. Ko es tier, J. N. (1951): Die Waldpflege, Frankfurt a/M. Krahl-Urban , J. (1952): Buchenbetriebszieltypen. Forstwissenschaftliches Centralblatt. L o e f 1 e r, K. (1968): Prognose für Holzverwertung und — Verwendung. Forst archiv, Heft 8. Leib und gut, H. (1966): Die Waldpflege, Bern. Mayer , H. (1977): Waldbau auf soziologisch-ökologischer Grundlage. Stutgart und New York. Mayer-Wegelin , H. (1952): Das Aufästen der Waldbäume, Hanover. M1 i n š e k, D. (1973): Möglichkeiten der Ertragssteigerung im subalpinen Fichten wald. Ü 100 Jahre der Hochschule für Bodenkultur, Wien, 4. Pint arid, K. (1969): Njega šuma. Sarajevo. Plavšić, M.-G o 1 üb o vi ć, U. (1964): Istraživanje postotnog odnosa pilanskih sortimenata kod jele (Abies alba Mill.). Šumarski list, sv. 1—2, Zagreb. Speidel , G. (1972): Planung im Forstbetrieb. Grundlagen und Methoden der Forsteinrichtung. Hamburg und Berlin. W o 1 fa r t h, E. (1961): Vom Waldbau zur Waldpflege, München. SUMMARY Does pruning as an additional measure in improving the quality of volume production possess its economic justification? In Yugoslavia, the main objective of production in forestry ought to be maximal production of the most valuable volume, which, however, cannot be attained solely by natural pruning of standing trees. Hence, in order to actualize this objective, it is necessary to prune the branches of Scots Pine. By sawing off branches in a part of the stem it is possible to increase the value of assortments by as much as 15 % in relation to assortimenls available from unpruned trees. In this paper is discussed the sawing off of branches in a natural pole forest of Scots Pine — on trees of the dominant storey with a diameter b. h. of 10—20 cm and at the height of 5—6 m. For this work an average time consumption of 5.5 minutes per tree was needed, which is almost negligible regarding the increased value, which is obtained during the main cutting. In conclusion are given the rules for pruning stems of Scots Pine. Primljeno 5. VIII 1977. Prof. dr. Konrad PINTARlC, dipl. inž. šum., Šumarski fakultet u Sarajevu, Zagrebačka ul. br. 20 |