Rit Mógilsár - apr. 2002, Blaðsíða 3

Rit Mógilsár - apr. 2002, Blaðsíða 3
3 2 SUMMARY Heiðarsson, L. 2001. Site index curves for larch (L. sukaczewii Dylis) in Fljótsdalshérað. IFRS report, 11/2002. 27 pp. The object of this study is to produce site index curves for the de- velopment of mean height in pure stands of Larch (L.sukaczewii Dylis). The sample was obtained from 34 random circular sample plots of 100 m2 in Hallormsstadur and Mjóanes eastern Iceland. The development of the arithmetic mean height of stands has been reconstructed by stem analysis of felled trees. The scope of application of these site index curves is limited to the district of inner Fljótsdalsherad in East Iceland. The function gives the mean height development of the stand based on biological age and site index (H100). The function has been developed by means of non-linear regression analyses based on the steepest descent method. In this approximative method the criterion of the best solution is the least sum of squares for the function. The calculation program used has been developed by Sloboda (1971). The conclusions are that larch plantations in Hallormsstaður are estimated to reach 25 meters mean height on the most fertile sites in 100 years and 17 meters on the poorest sites. Key words: Site index, larch, Iceland.

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