Relationship Between Some Structural Elements of Macedonian Pine (Pinus peuce Gris.) in Different Elevations in National Park Pelister in North Macedonia

The influence of elevation on the forest development and also more structural elements is evident. aim this paper to research impact relationship between diameter at breast height (DBH), tree (H), crown length (L) stem volume (V). In area Pelister National Park in North Macedonia, 22 experimental plots (EPs) were established even-age Pinus peuce Gris. stands with an average age 90 years. EPs a circular form covered 500 m2 each; 6 them 1150 meter above sea level (m asl), 7 1350 m asl 9 1550 asl. DBH, height, 481 trees measured all EPs. DBH – H model was prepared accordance Prodan, as well nonlinear (polynomial) regression for relation L (power) V. calculated formula by Parishko quadratic mean Loray ratio, density calculated. H, L, V examined Pearson correlation root square deviation (RMSE). differences averages from tested analysis variance (ANOVA) class (1150, asl) single factor. 490, 429 409 per ha m, asl, respectively. 39.8 cm, 46.5 cm 45.5 23.9 24.1 22.6 Crown ratio (CR) pointed out different results elevations, value 40.5%, 43.7%, 39.3% Differences elevations can be confirmed ANOVA significance p<0.05 F 3.4 3.2 data 9.7 that way, higher lower elevation, has longer bigger elevation. From results, it concluded one hand other hand. It said have smaller than