Comparison of the Basal Area Growth Model Parameters for Chinese fir and Larix olgensis

The basal area growth model is the most important one in the integrated stand growth model. This paper using sample plot data of Chinese fir (Cunninghamia lanceolata) stands from five provinces in the south of China and Larix olgensis stands from three provinces in the north of China establishes ten basal area growth models of the two species separately and the parameter adaptability among the provinces or regions are compared.The result show that the process of Chinese fir basal area growth are different between site regions where the process of dominant tree growth are similar or the planting areas even though in the same zone and in the same region, the parameters of the basal area growth model are different,so the site regions or planting areas can not be the criterion to establish different basal area growth models. The processes of the L.olgensis basal area growth are similar and there is no significant difference between the provinces for the parameters of the basal area growth model.