Analyzing the response curves of box tree (Buxus hyrcana Pojark.) species in relation to environmental variables in Hyrcanian forests

In the present study, the response curve of box tree to some edaphic characteristics (texture, nitrogen content, carbon content and pH) and physiographic factors (slope, aspect, and altitude) were analyzed in the Hyrcanian forests using random forest algorithm. For this purpose, 857 sample plots (400 m2) were established in the large habitats of B. hyrcana as selective method. The response curve of B. hyrcana Pojark showed that acidity and altitude are the most important and aspect and silt content are the least important variables. Also, based on the ecological optimum values for each variable showed that the Buxus tree is lime- and moisture-demanding species, which is present in low altitudes, steep slopes and light soils with high nitrogen content that can be used for the management decisions. The results and methods presented in the paper can also be applied to conserve and restore the other rare and endangered species.