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M. Šušnjar, N. Lukić: DVOULAZNE TABLICH OHUJAMA STABALA JELE U GOSPODARSKOJ JEDINICI ... Šumarski list br. 9-10. CXXVI1I (2004). 537-544 Emrović , B., 1960b: O najpodesnijem obliku izjenational des Forests, France, 76 (7): 44 pp. dnačenja funkcije potrebne za računsko izjednaPranjić, A. , 1990: Šumarskabiometrika. Sveučilišna čenje pri sastavu dvoulaznih drvno-gromadnih naklada Liber, 204 pp. tablica. Glasnik za šumske pokuse 14: 49-126. Pranjić, A., N. Lukić, 1997: Izmjera šuma. UdžbeKachigan , S. K., 1991: Multivariate statistical ananik. Šumarski fakultet Sveučilišta u Zagrebu, lysis - A conceptual introduction. Radius Press, 405 pp. New York, 303 pp. Qu inn, G.P. & M. J. Keough, 2002: Experimental Križanec , R., 1993c: Uloga evidencije sječe u praDesign and Data Analysis for Biologists. UK ćenju kretanja drvne zalihe preborne šume. Cambridge University Press, Cambridge, 537 pp. Glasnik za šumske pokuse, pos. izd. 4: 111-120. Serdar, V. & I. Šošić, 1981: Uvod u statistiku. Kružić , T., 1993: Izbor regresijskog modela za izjeŠkolska knjiga Zagreb, 452 pp. dnačenje drvno-gromadnih tablica. Glasnik za Špi rance, M., 1976: Tablice drvnih masa jele i smre šumske pokuse 30: 149-198. ke. Radovi 29, Šumarski institut Jastrebarsko, Kump , M. i suradnici, 1970: Poljski pokusi (Metodika 119 pp. postavljanja i statistička obrada). Centar za pri *** Šumarsko tehnički priručnik, Nakladni zavod Zna mjenu nauka u poljoprivredi SR Hrvatske, 86 pp. nje, Zagreb, 1966, 268 pp. Luce , P., 1976: Standing volume tables for Silver fir in the Jura. Document, Section technique, Office SUMMARY: The paper shows results of comparison of volumes of fir trees from forest management unit "Belevine" with volume of fir trees from Schuberg (1891) and Spiranec (1976) double-entry tables. The investigation sample are presented with 1.404 fir trees. Breast height diameters of the trees range from 20 cm to 85 cm while tree heights range from 12 m to 40 m. Sectioning of trees was done on all trees from the sample to preciously determine largewood volume (up to 7 cm diameter) of the trees over bark. Volume of trees up to 7 cm diameter over bark is presented with double-entries tables based on regression of data with Schumacher-Hall equation: V= 0,000075-d svHll = 0,053 m3 Timber volume increases with increasing of DBH and tree height. Volume of trees up to 7 cm diameter over bark ranges from 0,216 m3 for trees with 20 cm DBH and 12 m height 10,167 m3 for trees with 85 cm DBH and 40 m height. Timber volumes from double-entries tables from forest management unit "Belevina" have the higher values than timber volumes from Schuberg (1891) and Spiranec (1976) double-entry tables. In comparison with calculated double-entry tables, Schuberg tables give the lower volumes for fir- trees, especially for trees with DBH up to 70 cm. Comparison of calculated double-entries tables with Spiranec tables presents increasing of timber volume differences with increasing of DBH of trees. These differences are not in dependence on tree heights till 50 cm DBH, but onwards on thicker trees differences decrease with increasing of tree heights. Correction shows the need of increasing timber volumes by 1,81 % with using Schuberg tables or 5,56 % using Spiranec tables. Key words: fir, timber volume, double-entry volume tables |