Miazszosc drzew i zasobnosc sosny zwyczajnej roznych pochodzen na powierzchni doswiadczalnej w Polanach k.Grybowa

W pracy przedstawiono zróżnicowanie miąższości drzew niżowych i górskich pochodzeń sosny zwyczajnej na powierzchni doświadczalnej Polany k. Grybowa w Beskidzie Sądeckim.

The differentiation in total volume of single trees and the provenance volume in a mixed mountain forest site in the Nowy Sącz Beskid Range [3, 5, 6, 7] are presented. Table 1 contains average values of total volume of single trees and the volume of provenances (tn3/ha) at the age of 25 years, determined on the basis of height and breast high diameter measurements of all experimental trees, and calculated according to the formula: V= π/4 ·d2 · h · f1,3 where: V — volume of a single tree in m3, d — breast high diameter in cm, h — height of trees in m, f1,3 — b.h.d. number of shape [4, 2]. Pine trees from lowland provenances are characterized by the greatest volume; Lipowa (210.04 m3/ha), Supraśl (200.25 m3/ha) and Rozpuda (192.25 m3/ha), while the smallest volume characterized the Gubin provenances (110.89 m3/ha) and mountains pines from Piwniczna (138.48 m3/ha) and Nowy Targ (144.27 m3/ha) (Figs 1 and 2) [7]. Analysis of variance [1] shows a significant influence of genotype (provenance) and the lack of a significant effect of environment (block) on the evaluation of single tree volume (Tab. 2). The obtained results confirm the feasibility of increasing production of forest stands in mountainous territories by the introduction of the most valuable lowland provenances of pine in respective terrains.