根据日本落叶松人工林立木胸径生长规律和分化特征,确定了间伐起始期和间隔期。利用林木冠幅与胸径生长的相关规律,计算出不同径级林分适宜的密度指标,作为确定间伐强度的依据。根据研究结果,在湖北亚高山丘陵区及其附近的相似地区,日本落叶松人工林7～9a生时宜进行首次间伐,经4～6a后再进行第2次间伐。 According to the growth characteristics and differentiation characteristics of stand diameter of Larix kaempferi plantation, the initial period and interval of thinning were determined. According to the law of crown width and DBH growth, the suitable density index of different diameter stands was calculated as the basis for determining the thinning strength. According to the results of the study, the first thinning of Japanese larch plantations at 7-9 years of age in the sub-alpine hilly area of ​​Hubei and its nearby similar areas should be carried out for the first time, and the second thinning should be carried out after 4-6 days.