Vanclay, J.K., 1991. Aggregating tree species to develop diameter increment equations for tropical rainforests. For. Ecol. Manage., 42: 143-168. Pairwise F-tests provided an efficient approach for aggregating large numbers of species into a manageable number of groups for developing diameter increment functions. The first stage of the two-stage procedure identified the number of groups required...

Forest roads are the most important elements of forestry projects, the management, supervision, care, and only access way to the forest for mechanized harvesting and using other services of forests. The aim of this study was to compare the current annual increment of basal area in different distances from the road in northern forests of Iran. For this purpose, 50 plots were established in 5 dis...

This study attempted to detect the impact of ozone on adult trees of Norway spruce ( Picea abies [L.] Karst.) and European beech ( Fagus sylvatica L.) in an experimental mixed stand in Southern Bavaria, Germany. The aim was to examine whether there is a decrease in growth when trees are exposed to higher than atmospheric concentrations of ozone. This exposure was put into effect using a free-ai...

the oriental beech constitute one third of northern forests area and stocking volume in the north ofiran. these stands obseve in pure and mixed. in order to properly management which guaranteesustained yield, it is crucial to collect basic information including stocking (volume and stem number),tree growth, diameter distribution pattern, diameter-height relationship, diameter-volume relationshi...

Pairwise F-tests provided an efficient approach for aggregating large numbers of species into a manageable number of groups for developing diameter increment functions. The first stage of the two-stage procedure identified the number of groups required and the species defining these groups; the second stage aggregated all remaining species into the most appropriate group. Although there is no g...

This ar t ic le i s an in troduct ion to the computevsoffwave used by the Potential Relative Increment (PRI) approach to opt imal tree diameter growth modeling. These DOSpvograms extract quali f ied tree andplot data,from the Eastwide Forest Inventory Data Base (EFIDB), calculate relat ive tree increment , sort for the highest relat ive iucrements by diameter class, and generate an ASCIIjile fo...