Geographic Variation of DBH Growth of Chinese Fir Provenances Verification of the Impact of Chinese Fir Provenances on Basal Area Growth Models An Application of Linear Model to Testing the Universal Applicability of Site Index Curves for Chinese Fir Provenances The Impact of Chinese Fir Provenances on Site Index Curves Testing and Comparing the Impact of Chinese Fir Provenances on Basal Area Growth Models