Assessment of diameter growth of beech (Fagus orientalis Lipsky) in Guilan province

Document Type : Research article

Authors

1 Gilan Agriculture and Natural Resources Research Center, Rasht, Iran

2 Member of Scientific Board, Forest research Division, Research Institute of Forests and Rangelands, Tehran, Iran

3 Research Expert, Gilan Agriculture and Natural Resources Research Center, Rasht, Iran

Abstract

Beech (Fagus orientalis) is one of the most valuable species in Hyracanica forest which contain 26% of standing volume. A National project was planned and carried out to assessment of growth and performance of Fagous orientalis in Asalem region. In this study, eight plots were selected in different aspect and elevation from550 up to 2000 m. a. s. l. Each plot covered one hectar and in terms of dbh classification, five trees were selected in each plot. Tree height, dbh, diameter at median height, crown height and crown diameter was assessed. Other characteristics such as crown layer, crown health, crown size warp and branchiness of stem was considered. The obtained results of this study indicated that trees under 80 cm diameter had 170 m3 volume per hectar. The calculated form factor for beech was 0/4075. The value of mean annual increment was 3/47 m3. Correlation analysis showed that there was significautly correlation between height and age, diameter and age as well as dbh class and mean height crown, depth and dbh crown size.

Keywords


1) اصلی، ع.، اتر، ه. اتر، 1348. اندازه‌گیری رویش جنگل. نشریه دانشکده منابع طبیعی دانشگاه تهران، شماره 13.
2) اصلی، ع. 1355. اندازه‌گیری دینامیک و استاتیک. پلی‌کپی درسی دانشکده منابع طبیعی دانشگاه تهران.
3) اتر، ه.، 1370. جنگل‌داری 2. پلی‌کپی درسی دانشکده منابع طبیعی دانشگاه تهران.
4) زبیری، م، 1373. آماربرداری در جنگل. انتشارات دانشگاه تهران، شماره 2238، 401 صفحه.
5) حجازی، ر. 1342.اندازه‌گیری و آمار جنگل انتشارات دانشگاه تهران. شماره 865، 283 صفحه.
6) میربادین، ع، 1373. مقایسه رشد راش در توده‌های بکر و بهره‌برداری شده شمال کشور. انتشارات موسسه تحقیقات جنگلها و مراتع، شماره 104، 35 صفحه.
7) Geram, M.R.K. 1980. Elementary forest mensuration. New Delhl, 124 PP.
8) Pleter, g. de Vries, 1980. Sampling theory for forest inventory. Spring-Verlag, 399 PP.