苗木的生长发育是种子本身的遗传品质和周围错综复杂的生态因子综合作用的表现。对苗木作用较大的五个生态因子——水、肥、气、热、光,其中对光的研究是较少的。尤其在林木育苗领域,对光周期的研究和应用更少。随着科技的迅速发展,温室和塑料大棚育苗面积日益扩大,要求对光周期的育苗效益进行研究和应用。为此,我们于1982年在塑料大棚内进行了光周期对樟子松(Pinus sylvestris L. var mongolica)育 Seedling growth and development of the seed itself is the genetic quality and complex ecological factors around the performance of the complex. Larger on the seedlings of five ecological factors - water, fertilizer, gas, heat, light, of which the study of light is less. Especially in the field of tree nursery, research and application of photoperiod less. With the rapid development of science and technology, the growing area of ​​greenhouses and plastic greenhouses has been expanding day by day, requiring the research and application of the photoperiod-raising benefits. To this end, we conducted a photoperiod of Pinus sylvestris L. var mongolica in a plastic greenhouse in 1982