Forest Roads Effects on the Height of Forest Biomasses in the Margin of the Road and in Its Depth

In order to measure the height of forest biomasses in the Margin of the forest roads and comparing them with the height of adjacent biomass trees that are located in the distance of 100 meters from road margin, inventory operation was performed in the Radarposhte forest habitats in Guilan province Siahkal forests. In this habitat, one Kilometer of a road was chosen. Then tree diameter at breast and the height of trees were measured in 40 sample plots, an area of 10 sq. m that half of them were located along the forest roads and others were locatedin the adjacent biomasses. After collecting the data, necessary data saved in Excell software and were analyzed by Spss software and via the independent sample t-test and Duncan test. The results of this study showed there is no significant difference between the height of biomass trees in the left side (Piece 216) and in the right side (Piece 218) of the road, at the 5% level, but the depth average in the left and right is more than depth average in the left and right margins and that can be because of thick mother bases in the depth.