Study on the Growth and Models of Single Tree of Larix gmelinii Natural Forest in Daxing'an Mountains

In this study, 108 analytical trees of Larix gmelinii natural forest were selected from 65 standard plots in 7 regions, including Arong Banner, Chaihe, Erguna, etc. in Daxing’an Mountains and each factor was measured to study the growth pattern. The measured data was fitted with Schumacher, Mistcherlich, Clare, and Logarithmic growth equation to find out the most suitable tree growth model. The results show that the growth of height, DBH, and volume of natural L. gmelinii conform to the general tree growth. The average and current annual increment of height and DBH reached the maximum at 20 a, same at 26−28 a. The average volume growth and annual growth did not show the maximum value. It shows that the natural L. gmelinii in the study area has not reached the age of quantitative maturity at 70 a, and it is in a vigorous growth period. The optimum growth equation of heighand DBH growth model of L. gmelinii natural forest in Daxing’an Mountains was Mistcherlich growth equation, and the optimum growth equation of volume growth model was Rоляср. The results will provide a scientific reference for the optimization of forest structure and rational management of L. gmelinii natural forest in Daxing’an Mountains.