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Eslami A.R.,Islamic Azad University at Rasht | Hassani M.,Research Institute of Forest and Rangelands RIFR
Journal of Food, Agriculture and Environment

Considering close to nature silviculture, one of the major components for managing of uneven-aged forest stands under selection system is the diameter increment. In order to determine this factor, two uneven-aged beech stands were selected in the western (Asalem) and central part (Neka) of the Caspian forests and samples were taken within different diameter classes. Results showed that the mean annual diameter increment (m.a.d.i) varied between 3.5 and 3.0 mm in west and central part, respectively. This means that the m.a.d.i higher in the western part was 15% than central part, which might be related to the site quality as well as climate difference between the studied stands. Climate data indicate that the precipitation is higher in the western part, in contrast the dry period is longer in the central part. The mean period for passing a tree from one diameter class to higher one in Asalem and Neka was estimated about 14 and 17 years, respectively. The differences of m.a.d.i between these two regions were statistically significant (p<0.01). Source

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