延长光周期对科罗拉多冷杉容器苗生长的效应

该文研究了4种光周期（自然日长、16、19、22 h）对科罗拉多冷杉容器苗生长的影响.结果表明:延长光周期处理可以促进封顶后的科罗拉多冷杉苗顶芽绽开,所需平均天数为28、26、22 d；延长光周期能显著促进科罗拉多冷杉苗的生长和生物量的增加，以22 h（夜间补光10 h）效果最好，平均苗高可达10.86 cm，平均地径达0.32 cm，侧芽数、侧枝数平均为8个和7个，全株、地上、地下干重、须根长明显高于对照.两个种源对光周期反应有所差异，总的来说8号种源略好于10号种源. 

Effects of extended photoperiod on the growth of Abies concolor seedlings

The effects of four kinds of photoperiods on the growth of Abies concolor seedlings were studied. The results showed that terminal buds flushed under the extended photoperiod, the average days of bud bursting were 28, 26 and 22 days; extended photoperiod could promote the growth and biomass allocation of the Abies concolor seedlings, especially a treatment for 22 hrs got the best results: average height 10.86 cm, average root collar diameter 0.32 cm, average number of lateral buds and lateral shoots 8 and 7 respectively, total dry weight, shoot and root dry weight and hair roots were all greater than that of CK seedlings. The two provenances used in this study responded differently to the extended photoperiods and in general, provenance No.8 was a little better than No.10.