مطالعه زادآوري توده هاي طبيعي راش در دوشيوه جنگل شناسي تدريجي پناهي و تك گزيني ( مطالعه موردي جنگل هاي سياهكل )

The Study of regeneration,natural stands on Fagus Orientalis Lipsky in two methods civiliculture: Shelter wood and selection system method (case study of siahkal forest)

Sustainability and development in forest is dependant on stability and development of natural regeneration. So fate of a natural forest is dependant on present situation of regeneration. In present study, regeneration stability situation was studied in two shelter wood and selection systems methods in natural mass of Fagus Orientalis Lipsky. Studied forest is located on domain of Siahkal natural resourses center and Shenrood forestry plan. In this study, two domain are compared to each other which one of them was applied in shelter wood and the other in selection systems method. After area identification, 15 holes were selected in each method. After hole recognition and identification of their center, we moved 20 meters in 4 main directions and creacted a 400 meters plot and quantitative characteristics of yearlings (number of yearlings, their height, their diameter) are measured in each hole. Applied test in this study is t-test. Comparison of total frequency and test results indicated that total number of regeneration in shelter wood methods is more than selection systems method and percent ofʹ regeneration in shelter wood method is more than selection systems method, that means ,it has a more pure population than selection systems method. Percent of regeneration in other species in selection systems is more than shelter wood methods that means regeneration in selection systems method is more mixed than shelter wood method. In the number of regeneration with height shorter than 1.30 cm significant difference was not observed, But the number of yearlings with height more than 1.30 cm in shelter wood method was more than seletion systems method. The number of yearlings in diameter levels of 1.5 cm are decreasing in two methods. But density of this decrease in shelter wood is much lower than selection systems method. So that in selection systems ,only in two diameter levels, yearlings were measured but in shelter systems method yearlings were present in each four diameter levels.