By using the methods of regression analysis and model optimal selection, the biomass of each organ of Larix kaempferi was measured, and the biomass equations for L. Kaempferi in Xiaolong Mountain of Cansu Province was built. The results showed that; The average biomass of young, immature, nearly mature, and mature forest of L kaempferi were 3.617,29. 846,123. 954,and 177.482 kg. The biomass ratio of the stem, roots, branches, bark, leaves of different-aged L kaempferi were 32:17:23:11: 17 (young growth) ;50= 20:15: 10:5 (immature) ; 62:15=10:9:4 (nearly mature) ;and 58:23:9:8:2 (mature forest). The biomass between DBH, height and various components, between each component and root and needle, and between aboveground and underground were significantly correlated. The final prediction model of individual tree biomass is lnW total = -1.916 4 + 0.768 11 ln( D2H) and the value of R2 is 0. 986.%柯甘肃小陇山林区不同年龄的日本落叶松人工林单木各器官生物量进行了测定,并运用回归分析和模型选优的方法建立了日本落叶松人工林单株生物量估测数学模型.结果表明:日本落叶松幼龄林、中龄林、近熟林、成熟林单株的平均总生物量分别为3.617、29.846、123.954、177.482 kg,各林龄段干、根、枝、皮、叶各器官生物量比值分别为32:17:23:11:17(幼龄林)；50:20:15:10:5(中龄林)；62:15:10:9:4(近熟林)；58:23:9:8:2(成熟林)；树高、胸径与各组分生物量之间、各组分生物量与根和叶生物量之间以及地上与地下部分生物量之间相关性显著；最终确立的单株生物量预测模型为InW总=-1.9164+0.768 Iln(D2H),模型R2为0.986.
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