مقايسه تراكم زادآوري و تنوع گونه اي در توده هاي طبيعي و مديريت شده جنگل بلوط لوه

Comparision of regeneration density and species diversity in managed and natural stands of Loveh Oak Forest

The knowledge of effect implement forest management systems on regeneration density and species diversity is very important and essential for conservation and forest sustainable devlopment, The effects of shelterwood system (stands 25 and 45 years old or stand I and 2) were detected on regeneration density and species diversity and were compared with natural stand in the Loveh forest (Golestan province). Systematic random network was established with dimensions 60x60 m and 60 plots were measured. Then all data including species, DBH and implement regeneration information saplings complete lower and greater than 1.30 m hieght were recorded. Results showed that regeneration density have significant different (on level 99% probability) in the natural stand with managed stand (stand I & 2). Hense it was observed maximum density saplings in managed stand (25 year). Results also showed that stands have signifieant difference in the richness indices and Simpsonʹs hetrigenity indices. This acount is lower compared to managed stand but it is increase opposite eveness value (Smit- Wilson). Species diversity was higher than these in managed stand due to reduced canopy cover and establishing on ligth-demanding species.