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Road cross section, as one the main eff ective factors in relation to fi ll and cut volume, was eff ective in costs and disturbance of forest road constructions. In this research, the eff ect of a few physiographic parameters on forest road cross section was evaluated. For this purpose, 192 cross sections on forest roads were delineated selectively in mountain forests in the north of Iran. Th e physiographic factors including elevation, hillside slope, slope aspect, rock base, and soil texture as well as cross section width were measured. After evaluating the data in terms of normality and homogeneity, it was analysed by Spearman's and Pearson's correlation tests using SPSS20. One-way ANOVA, two-way ANOVA, and Dun- can grouping tests were used to determine the eff ect of the above-mentioned factors both separately and simultaneously. Results showed that the parameters including hillside slope, rock base, and soil texture had a signifi cant eff ect. Elevation was recognized as a regional parameter due to the lack of any relationship with cross section. Th ere was no signifi cant relation between slope aspect and cross section. Th e hillside slope was defi ned as the most eff ective parameter on the cross section.

Evaluating the effects of physiographic parameters on the road cross section in mountain forests (Case study: northern forests of Iran)