Surveying and study on the biometric variables of poplar plantations in Guilan province

In order to plan and make managerial decisions for the development of wood farming in Guilan province, parameters such as area, distribution, and biometric variables of poplar trees were measured separately for each county. To conduct this research, the field of poplar plantations was located using the Global Positioning System (GPS) and measured with 100% inventory method. In each poplar plantation section, for every 2000 square meters, nine middle trees were measured for the biometric variables. The correlation between the characteristics of area and increment of trees with climatic indicators and soil was also plotted. According to the findings of this project, the total area of poplar plantations in Guilan province was 12,179 ha in 2018, with the highest belonging to Sowme`eh Sara county with 6,944 ha, comprising 11.8% of the county area. This county ranked first in poplar tree cultivation with the highest number and volume of trees. The area of poplar plantation was the lowest in Astara, Amlash, and Fouman counties. The highest mean age of trees was obtained in Rudbar and Tavalesh, while the lowest mean age and number of trees were obtained in Fouman county. The characteristics of the total number of trees, volume, and area of poplar plantation showed the highest correlation coefficient with climatic indicators and total nitrogen. The findings of this research can provide valuable basic information for monitoring the area of poplar plantations, planning and management decisions, and identifying areas suitable to poplar plantations for wood farming in Guilan province and the country.