Ecology, Environment and Conservation Paper

Vol.18, Issue 1, 2012; Page No.(7-12)

CONSIDERING THE SILVICULTURE CHARACTERISTICS OF MANMADE ALNUS SUBCORDATA AND ACER VELUTINUM SPECIES IN IRANS NORTH FORESTS

Seyedeh Rezvaneh Fallahchai1, Mir_Mozaffar Fallahchai1 and Hamid Payam

Abstract

In this study the manmade Alnus subcordata and Acer velutinum species that were available in parcelle 112 from Guilan province forest in North of Iran were studied from the view point of quantitative and qualitative characteristics. The inventory was done by the random systematic method in 57 sample pieces with a 5 percent intensity. The obtained results showed that the minimum and maximum Alnus subcordata trees thickness growth of Alnus subcordata trees is 1.30 centimeter and that of the Acer velutinum trees is 0.98 centimeter. Also the maximum and minimum height of Alnus subcordata trees are 9 and 23 meters and in Acer velutinum species it is assigned as 9 and 18 meters. The height mean of the Alnus subcordata trees is 15.05 and the height mean of Acer velutinum trees is 14.11 meters, these trees annual height growth means are obtained in order for Alnus subcordata 0.75 meter and Acer velutinum 0.7 meter. These trees dimention means in order are calculater in Alnus subcordata 45.58 silve and for Acer velutinum 22.78 silve. As for the distribution models the number of trees in diameter classifications made clear that Alnus subcordata species didnt have a normal distribution but the number of distribution in diameter classifications in Acer velutinum species forms a normal distributions. The statistical tests show that the thickness, height and dimension of the studied trees with a 95 percent probability have a significant difference with each other. The study of the qualitative characteristics of the two Alnus subcordata and Acer velutinum species showed that only the trunks intricacy character in the level of á = 7% and the crowns health character in the level of á= 5% are significant and the other studied qualitative characters didnt show a significant difference.

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