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J. Cavlović & D. Kroner: OSOBITOSTI DEBLJINSKOG RASTA I PRIRASTA STABALA U SASTOJINAMA.. Šumarski list br. 3-4, CXXVI (2002), 145-153 Kremer , D., 2001. Zastupljenost američkog bijelog Prpić , B., 1966: Korijenov sistem poljskog jasena jasena (Fraxinus americana L.) i pensilvanskog (Fraxinus angustifolia Vahl) u različitim tipovijasena (Fraxinuspennsylvanica Marshall) u Poma posavskih nizinskih šuma. Doktorska diserkuplju, Posavini i dijelu Podunavlja. Magistartacija. Šumarski fakultet Sveučilišta u Zagrebu, ski rad, Šumarski fakultet, Zagreb, 227 pp. Zagreb, 101 pp. Matić, S., 1971: Prirodno pomlađivanje poljskog Sinclair, W. A., Griffiths, H. M. & Treshow, jasena (Fraxinus angustifolia Vahl) u Posavini. M., 1993: Impact of ash yellows mycoplasma- U: J. Kovačević & Z. Racz (ur.), Savjetovanje o like organisms on radial growth of naturally inPosavini, Poljoprivredni fakultet Sveučilišta u fected white, green, and velvet ash. Canadian Zagrebu, Zagreb, pp. 343-346. Journal of Forest Research. 23: 12, 2467-2472. Pačala, S. W., Canham, C. D., Si lander, J. A. Jr. Strepački, V, 1931: O rentabilitetu odvodnjavanja & Kobe , R. K., 1994: Sapling growth as a bara u slavonskim šumama. Šum. list 7 (55): function of resources in a north temperate forest. 308-311. Canadian Journal of Forest Research. 24: 11, Osnova gospodarenja za Gospodarsku jedinicu "Klju2172- 2183. čevi" od 1999. do 2008. godine. "Hrvatske šuPerušić , A., 1925: Krajiške Imovne Općine. Šum. me" p. o. Zagreb, Uprava šuma Nova Gradiška, list 11(49): 631-641. Odjel za uređivanje šuma, šumarija Nova GradiPlavšić , M., 1960: Prilog istraživanjima u čistim i ška, Nova Gradiška, 1999. mješovitim sastojinama poljskog jasena (FraxiOsnova gospodarenja za Gospodarsku jedinicu "Po nus angustifolia Vahl). Glas. šum. pokuse, 14: dložje" od 1999. do 2008. godine. "Hrvatske šu 259-313. me" p. o. Zagreb, Uprava šuma Nova Gradiška, Plavšić , M., & Klepac , D. : 1960: Strukturni Odjel za uređivanje šuma, šumarija Nova Gradiodnosi posavskih šuma obzirom na broj stabala, ška, Nova Gradiška, 1999. temeljnicu i drvnu masu. Glas. šum. pokuse, 14: 314-358. ZAHVALA - Acknowledgement Na velikoj pomoći pri obavljanju terenskih istraži- Nova Gradiška, te Uprave šuma Nova Gradiška, vanja zahvaljujemo se djelatnicima šumarija Stara i SUMMARY: The research was carried out in two middle-aged mixed stands of narrow-leaved ash and white ash aged 54 and 50 years in the area of the forest offices Nova and Stara Gradiška. The recordings of stand structures in the locality of the forest office of Nova Gradiška showed the mean stand diameter of 30.9 cm in the 54-year-old stand at an altitude of 94 m. In the locality of the forest office Stara Gradiška situated 104 m above sea level, the mean stand diameter was 22.7 cm. Samples of increment cores of 12 cm in length were taken for narrow-leaved ash and white ash from the trees belonging to the diameter degree of mean basal area trees. The increment cores were analysed by measuring the width of every individual ring by a tenth of the millimetre. The thickness of the bark was also measured. The results obtained from the analysis of the increment cores gave the trends in ring widths for individual trees, as well as the trends in average ring widths within individual samples in the last 35 or more years. Also, on the basis of the increment core analysis, parts of the diameter growth curve of the mean stand tree for every studied species were obtained. The method is described in the paper. According to the results, the diameter growth was equal in both species in the first period of life, that is, in the first 15 years, followed by a more rapid growth in the diameter of narrow-leaved ash in relation to white ash. In other words, the diameter increment of narrow-leaved ash was higher during the studied period, which indicates better conditions for the growth of the autochthonous narrow-leaved ash. Key words: narrow leaved ash (F. angustifolia Vahl), white ash (F. americana L.) growth of mean stand diameter; radial increment |