تاثير جاده هاي جنگلي آسفالته و خاكي بر ميزان موجودي حجمي توده هاي حاشيه جاده و مجاور

Effect of asphalted and earthy forest roads on stock growth of edge and adjacent stands

In order to determining the mean stock growth of stands at the edge of asphalted and earthy forest roads and to comparing them with mean volume per hectare of adjacent stand which had located at the distance of 100 m from road edge, the inventory was performed in three northern forest site of Neka, Amreh and Darab Kola. In each of site, a road with the length of one kilometer was selected. Then. number per hectare and diameter at breast height of trees in twenty plots with a size of 1000 mʹ which half of them had been established along forest roads and other had been established in adjacent stand, were measured. Volume table (Tarrif) was used to calculate the stock growth of stands at the edge of road and adjacent. The results of this study indicated that the stock growth of forest roads edge of the Naka and Amre was more than adjacent stands at probability levels of O. I and I%, respectively. But in Darab Kola site, there was no significant difference between the stock growth of road edge and adjacent stand. The stock growth offorest stands at the edge ofNeka asphalted road was more than the stock growth of stands at the edge of Amre and Darab Kola earthy roads at probability level of 5%. Maybe Alnus subcordata C.A.M abundance, light availability, soil fertility and creating a heat island around the corridor cause a stands stock growth rising at the edge of road in proportion to adjacent and also cause a stands stock growth rising at the edge of asphalted road in proportion to earthy roads which has need a accuracy investigation.