Paper Information

Journal:   IRANIAN JOURNAL OF FOREST AND POPLAR RESEARCH   WINTER 2017 , Volume 24 , Number 4 (66) #B0061; Page(s) 633 To 645.
 
Paper: 

RESPONSE OF GALL OAK (QUERCUS INFECTORIA OLIV.) TO POLLARDING IN NORTHERN ZAGROS

 
 
Author(s):  ROSTAMI JALILIAN A., GHAHRAMANY L.*, GHAZANFARI H., SHAKERI Z.
 
* DEPARTMENT OF FORESTRY, FACULTY OF NATURAL RESOURCES, UNIVERSITY OF KURDISTAN, SANANDAJ, IRAN
 
Abstract: 

This study aimed to investigate the response of gall oak (Quercus infectoria Oliv.) to pollarding. Therefore, a less-disturbed stand (1.4 ha) and a pollarded stand (1.7 ha) were selected. Five rectangular plots (20×30 m) were established in each selected stand by random sampling. In each plot, tree species, diameter at breast height (DBH), total height, trunk height and crown diameter for all trees (DBH³ 5 cm) were recorded. In addition, 18 tree samples were taken in each studied stands to assess the diameter increment of Gall oak. A pair of increment cores per sample tree was taken 50 cm above ground level, in which annual radial increment was measured and further multiplied by 2 to derive the annual diameter increment. Then, the diameter increment distribution of gall oak trees in identical diameter classes was determined for the period of 1984-2010. The mean radial increment of two cores extracted from each sample tree was used in the calculations. The results showed that the average diameters, total height, trunk height, crown height and crown area were significantly lower (P<0.01) in pollarded stands. Moreover, the average diameter increment in less disturbed and pollarded stands was estimated 1.32 and 2.08 mm per year, respectively. The results indicated that average diameter increment of gall oak trees across the identical diameter classes during the studied period was significantly different between the examined stands.

 
Keyword(s): BIOMETRIC INDEX, GALL OAK, NORTHERN ZAGROS, POLLARDING
 
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