Determining the Economically Optimal Utilization Age of Loblloly Pine (Pinus teada) in Guilan Province

The aim of present study was to determining the Economically Optimal utilization Age of Loblolly Pine (Pinus taeda) in Guilan Province.

For this purpose, growth data and the price of Tada pine wood were used. Regression analysis was used to determine the best model of Teda pine growth.

The results showed that the best relationship between volume growth per hectare and age of a growth model is a few third degree sentences. The equation for the price of Teda pine trunks was reduced using its model. Due to the lack of significance of this relationship at the level of 0.05, the average price of standing wood was used in different years. According to the price, annual growth and bank interest rate, the optimal age of Teda pine was obtained according to technical and economic criteria.

Results showed that economically optimum utilization age of Teda pine changes with different discount rates, optimal rotation age follow different trend.