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在华北落叶松人工林中设置标准地，分别按径阶选定样木，测定根粗大于１ｃｍ的根系生物量，同时用土柱法测定根粗小于１ｃｍ的根系生物量。结果表明，根系生物量占总生物量的１８．２％～３０．８％，根系生物量与林木径阶的变化有极显著的相关性，根粗小于１ｃｍ的根系生物量集中分布于０～２０ｃｍ的土层中。
The standard biomass was set in Larix principis-rupprechtii plantation, and the root biomass of roots larger than 1 cm was determined according to the diameter of the selected samples. The root biomass of roots less than 1 cm was determined by soil column method. The results showed that the root biomass accounted for 18.2% ~ 30.8% of the total biomass, and the root biomass had a very significant correlation with the change of tree diameter. The root biomass of roots less than 1 cm concentrated in 0 ~ 20cm of soil.