Author/Authors :
Taheri Abkenar، K. نويسنده Faculty of Natural Resources, Department of Forestry, University of Guilan, Somesara, Iran , , Seddighi Chafjiri، F. نويسنده M.Sc. Graduate in Forestry, University of Guilan, Somesara, Iran , , Mahmoudi Sardabrud، S. نويسنده M.Sc. Graduate in Forestry, University of Guilan, Somesara, Iran ,
Abstract :
The expanding phenomenon of dieback is caused by the reaction of trees against the harmful biotic and abiotic factors that lead to dying of shoots and branches of trees from upper crown to lower crown. This phenomenon spreads throughout the leaves and branches and all parts of the plant and may finally lead to the death of the plant. This study aimed to identify species dieback with especial attention to Carpinus betulus and the spread of dieback in this species using topography factors in series one of Shast Kalate Forest, north east of Iran in Golestan Province. In the study area, a statistical network with dimensions of 600×800 m was randomly and systematically designed (network of plots) and cluster sampling with six trees was applied in every plot. Topographical factors (altitude, slope direction and percentage) in each plot were taken. Analysing the data indicated that 28% of the total stands suffered from different degrees of dieback among which 22% belonged to the Carpinus betulus species. The percentage of dieback stands of this species in different classes of height had no meaningful difference, but it was located more in western aspect and gradients of less than 20%.
