Estimation of logging residuals from single selection cutting by Line Intersect method (Case study: parcel 237 from district 2 Guilan- Nav forest)

Prediction of volume and characteristics of logging residuals before logging operation is one of basic information about decision and residual management. In this research, volume and characteristics of logging residuals were studied in parcel 237 with 41ha from Guilan-Nav mountainous Fagetum forest area. Silviculture and logging method in these forests is selection cutting and assortment (short and long log) method. Systematic sampling design with twenty 100m sample lines were used for estimation of volume, weight and characteristics of residuals in parcel and volume of each piece of residuals were calculated by Huber formula. The volume, weight and number of logging residues per hectare were estimated 3.6m3, 2.5 ton and 233 pieces, respectively. The averages of volume, weight, length and middle diameters of pieces were calculated 0.02m3, 15kg, 1.5m and 10cm, respectively. About 65% of residual volume was compounded by woody materials that had first class quality and without decay and knot. Ratio of logging residue volume to number of tree felling was 0.58m3. This ratio for each 100 sylve of selected trees was 17m3. Also, volume of logging residual for each 100cm diameter at breast height of harvested trees was 1.08m3. These amounts of logging residuals are considerable and useable in wood industries. So export of those can have economic value.