نوع مقاله : علمی- پژوهشی
نویسندگان
1 استادیار پژوهش، مرکز تحقیقات کشاورزی و منابع طبیعی استان مازندران
2 دانشیار پژوهش، مؤسسه تحقیقات جنگلها و مراتع کشور
3 کارشناس پژوهش، مرکز تحقیقات کشاورزی و منابع طبیعی استان مازندران
4 دانشجوی کارشناسی‌ارشد، دانشگاه علوم کشاورزی و منابع طبیعی گرگان
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
The permanent plot, with 6.1 ha area, is located on mid-elevation of Hyrcanian forests at district 3 of Section 5 in Neka-Zalem Roud forest project. After fencing the border of the area, a metal number tag was installed on each tree. The full census inventory method performed and in each diameter class, ten trees were measured for preparing of tree height curves. Tree frequency in height classes (or crown layers) was obtained in the basis of: the diameter classes in each height stage, tree frequency in diameter classes and relationship between tree diameter and height. Forest structure, dead trees (snag and log) and damaged trees (hollow and broken), and rate of them within the stand were analyzed. Results showed that the stand consists of uneven-aged Beech-Hornbeam (Fagus orientalis-Carpinus betulus) with three layers. De Liocourt factor of stand is 1.27; diameter and height regression is fitted with S form model. The ratio of Beech height increment is higher in ages before reaching to 45 cm dbh. Hornbeam trees have higher height increment speed in younger stages in competition to beech. Damaged trees contain 10 percent of the stand volume, of which one-third is hollow trees, one- third broken trees and the rest are snag and log.
کلیدواژه‌ها [English]
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