大兴安岭兴安落叶松天然林单木生长规律与模型研究

本研究利用大兴安岭阿荣旗、柴河、额尔古纳等7个地区设置的65块标准地中选取的108株天然兴安落叶松解析木实测数据，分析研究其生长规律，应用舒马切尔、单分子式、柯列尔和对数型生长方程对其进行拟合，并对拟合结果进行评价，优选出适应性最强、稳定性最高的单木生长模型。结果表明：天然兴安落叶松树高、胸径、材积生长规律均符合一般树木生长规律。树高和胸径的平均生长量和连年生长量均在20 a时达到最大值，26～28 a左右相等。材积平均生长量和连年生长量均未出现最大值，说明研究区内天然兴安落叶松到70 a时仍未达到数量成熟龄，正处于旺盛生长期。大兴安岭地区天然兴安落叶松最优树高生长模型为单分子式生长方程，最优胸径生长模型为单分子式方程，最优材积生长模型为柯列尔生长方程。本研究可为大兴安岭地区天然兴安落叶松林分结构优化、合理经营提供参考。

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.