Testing and Comparing the Impact of Chinese Fir Provenances on Basal Area Growth Models A Stem Taper Model with Nonlinear Mixed Effects for Dahurian Larch Simulation of Larix gmelinii tree volume growth based on random effect. The Impact of Chinese Fir Provenances on Site Index Curves Establishment of Tree Height Growth Model Based on Mixed and Nlmixed of SAS Verification of the Impact of Chinese Fir Provenances on Basal Area Growth Models