DefinePK

Abstract

Abstract: To study the results of interference of strip cutting and single selection systems during the performance of the plan (1993-2003) in the Janbe Sara district, raw data which was collected during two years were compared together. Inventory was done in systematic random way and intensity of 3.3% in both years. In this research parameters like average diameter of basal area mean (in breast height), volume mean and density in ha, diameter distribution, regeneration situation and qualitative class of trees were studied. Totally this study's results showed that although the diameter distribution curve in 2003 was getting close to the normal curve, as compared with 1993, but was still for from it in district. Also against the reduction of volume mean in ha, diameter of basal area mean and the percentage of trees in high qualitative classes in both methods were reduced, we should point that, this reduction in single selection parcels is less than strip cutting parcels. Results of studying the density in ha of trees and regeneration show the equal increasing process in both groups of parcels (single selection and strip cutting). Generally according to failure of the plan, with comparing both methods, we can conclude that we can get better results of single selection rather than strip cutting. Meanwhile considering 68% strip cutting harvest of the district the majority of strip cutting is affecting the failure of the plan.