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在药乡林场日本落叶松人工林内设置固定标准地进行调查，结果表明：第１次间伐强度分别为１２．２％、２３．６％、３４．２％，第２次间伐强度依次为２３．０％、１５．１％和１０．４％。间伐能显著地促进林木生长，第１次间伐３年后林分蓄积量增长率比对照高５．８％～３８．４％。第２次间伐２年后，不同间伐强度间林分生长差异不显著。认为：日本落叶松人工林初植密度可较大，第１次间伐宜采用中、强度间伐，第２次再采用较小强度的间伐。
The results showed that the first thinning intensity was 12.2%, 23.6% and 34.2% respectively, and the second thinning intensity was 23 in turn. 0%, 15.1% and 10.4%. Thinning can significantly promote the growth of forest trees. After 3 years of the first thinning, the growth of stand volume increased by 5.8% -38.4% compared with the control. After 2 years of the second thinning, there was no significant difference in stand growth between different thinning intensities. It is considered that the planting density of Larix kaempferi plantation can be larger, the first thinning should be moderate and thinning, the second thinning should be less intensity.