بررسي ساختار و زادآوري درختان جنگلي در توده‌هاي بهره‌برداري شده و بهره‌برداري نشده (مطالعه موردي: جنگل دارابكلاي ساري)

Investigation of Structure and Regeneration Forest Trees in Logged and Non-logged Case of study: Darabkola Forest of Sari

با توجه به اهميت درختان جنگلي، تأثير شيوه جنگل شناسي اعمال شده بر ساختار و زادآوري درختان جنگلي در دو توده بهره‌برداري شده و بهره‌برداري نشده مورد بررسي قرار گرفت. منطقه مورد مطالعه داراي دو قسمت برابر بهره‌برداري شده به شيوه پناهي و بهره‌برداري نشده است كه بعد از گذشت 10 سال از زمان بهره‌برداري مورد بررسي قرار گرفت. بدين منظور تعداد 60 پلات (1000 مترمربعي) و ميكروپلات (100 مترمربعي) به صورت تصادفي سيستماتيك در عرصه پياده شد. مقايسه قطري درختان موجود در پلات دو توده نشان دهنده اختلاف معني‌داري (0/05

In this study the effects of the silvicultural methods was investigated on structure and regeneration of the forest trees in logged and non-logged stands according to the importance of forest trees. The forest had two regions with same areas which one of them was logged through shelterwood system and another was non-logged. Logged stand was assessed after 10 years from harvesting. 60 plots (1000 m2) and micro-plots (100 m2) were systematic randomly established in the field. The comparison of the diameter of trees between these two stands showed the significant difference (P<0.05). With comparison of the vegetative parameters of four trees near to plot center it was demonstrated that there was significant difference between two stands concerning diameter at breast height (P<0.05), stem height (P<0.05), crown height (P<0.01), basal area at breast height (P<0.01) and volume (P<0.05). There wasn’t significant difference for total height, minimum and maximum diameter of crown and basal area of crown. Comparison of the regeneration in micro plots of two stands indicated the significant difference at probability level of 99 percent for regeneration density of stands. Moreover, there was significant difference at probability level of 95 percent between two stands for regeneration quality.