The Study of Result Shelterwood System Performance in Regeneration Zone Forest Plan in District 2 Ashk of Mazandaran Province.

In this study , the condition of zone regeneration investigated in Ashk forest plan in the end of period performance unit zone method and shelterwood. Begining of Ashk plan was in 1349.Inventory did in district 2 of regeneration zone in systemically with 3.3 intensity in circular plot that was in 10R. Species composition structure and stand biomass and increment in zone compared in beginning and end of plan during performance. This study indicated that this plan had been succeed in increasing percentage of beech composition forest structure has been multilayer uneven age irregular before shelterwood performance , but it changed structure uneven age with low volume and young after plan performance. Un successful in this plan in residual industrial volume and uneven age structure could be found in performance of incorrect and not exact of shelterwood system. Moreover, being livestock, high density of skid trail unknowing of forester and agents of utilization has been affected as well.