Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.

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Orzeł S. 2007. A COMPARATIVE ANALYSIS OF SLENDERNESS OF THE MAIN TREE SPECIES OF THE NIEPOLOMICE FOREST, EJPAU 10(2), #13.
Available Online: http://www.ejpau.media.pl/volume10/issue2/abs-13.html

ABSTRACT

The effect of age of trees on their slenderness (s) and the relationship between slenderness and tree d.b.h. (d) and height (h) were determined on the basis of measurements of d.b.h. and height of 6070 the upper story trees growing in over 400 circular plots established in stands of age class II and older in the Niepołomice Forest District. The following eight tree species were investigated: Pinus sylvestris, Quercus robur, Carpinus betulus, Betula verrucosa, Alnus glutinosa, Fraxinus excelsior, Tilia cordata, and Larix decidua. From among these species F. excelsior was characterized by the highest mean slenderness (1.047), while P. sylvestris by the lowest one (0.773). High, usually over 0.800 in value, coefficients of correlation between slenderness and d.b.h. indicated a great usefulness of d.b.h. for elaboration of formulae determining slenderness of analyzed tree species. A logarithmic function (s = α · ln d + β) turned out to be the best in estimation of slenderness of P. sylvestris, L. decidua, A. glutinosa, and B. verrucosa, while in the case of Q. robur, C. betulus, and F. excelsior an involution function (s = α · d ^β ) was the best, and for T. cordata – an exponential function (s = α · e ^β·d ).

Key words: coefficient of slenderness, coefficient of correlation, empirical formulae, tree stability.

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Stanisław Orzeł
Department of Forest Mensuration,
Agricultural University of Cracow, Poland
Al. 29 Listopada 46, 31-425 Cracow, Poland
email: rlorzeł@cyf-kr.edu.pl

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