Study of Biomass of Picea schrenkiana var.tianschanica and Its Variation
A vertical transect investigation on Picea schrenkiana var.tianschanica forest communities in three locations with different longitudes (Gongliu,Urumqi and Hami) along the Tianshan Mountains from west to east was conducted.The biomass was estimated with the regression equations and the data of the community investigation.Variations of the biomass along with the altitudinal gradients and DBH classes were analyzed.The results showed that the biomass in different sites ranged from 100.921 to 436.915 t ·hm-2.The biomass of the forest in the west part of Tianshan Mountains was higher than those in the middle or the east part.Variation of biomass along the altitudinal gradients and with the DBH classes all revealed a unimodal pattern.