中文摘要：

目的：研究不同生长期当归根部生物量及有效成分的动态变化规律。方法：采收不同生长期当归27批,并测定其根部生物量;采用气相色谱-质谱联用技术（GC-MS）测定当归挥发油中Z-藁本内酯与正丁烯基苯酞的含量。结果：GC-MS法测得27批不同生长期当归挥发油中正丁烯基苯酞、Z-藁本内酯的平均含量分别占总油的1%和40%以上,其含量在不同生长期中变化较大。结论：当归中Z-藁本内酯与正丁烯基苯酞含量与其生长周期密切相关。

英文摘要：

Objective ：To study the variation of the biomass of the root and active components of Angelica sinensis during different growth periods. Methods ： 27 batches of Angelica sinensis were harvested from different growth periods, and the biomass of underground parts were determined; The Gas Chromatography - Mass Spectrometry （GC-MS） was used for determining the contents of Z-ligustilide and n-Butylidenephthalide in essential oil of Radix Angelieae Sinensis. Results： The average contents of n-Butylidenephthalide and Z-li- gustilide were more than 1% and 40% in the total essential oil of Radix Angelicae sinensis respectively. Their contents showed larger difference during different growth period. Conclusion： The contents of Z-ligustilide and n-Butylidenephthalide of Radix Angelicae Sinensis is closely related to their growth period.