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北欧、北美的许多地区在夏季造林前对云杉苗木进行2~3周的短日照处理,以促进苗木提前形成顶芽和进入休眠,提高苗木的木质化程度,增强苗木抗机械损伤和抵御生物或非生物胁迫的能力;通过抑制苗木的高生长,使碳水化合物更多地向根系分配,可促进根系的生长发育,增强苗木吸收水分、养分的能力,显著改善夏季造林苗木的质量,取得了较好的造林效果。目前,应用短日照处理调控夏季造林苗木质量的相关研究受到广泛关注。文中重点分析短日照处理的起始时间、持续时间和日照长度等主要技术参数对苗木木质化及其抗旱性和抗寒性的影响,并对短日照处理技术在我国夏季造林中的应用提出展望。
Short-day treatment of spruce seedlings for 2 to 3 weeks prior to summer afforestation in many parts of Northern Europe and North America to promote nursery shoot formation and dormancy in advance, to increase the lignification of nursery stock, to enhance seedling resistance to mechanical damage and to organisms Or abiotic stress; by inhibiting the high growth of seedlings, the more carbohydrate distribution to the roots, can promote the growth and development of roots, enhance the ability of seedlings to absorb water and nutrients, significantly improve the quality of summer afforestation seedlings, obtained Better afforestation effect. Currently, the application of short-day treatment to control the quality of summer afforestation seedlings have received widespread attention. The paper mainly analyzes the influence of the main technical parameters such as the start time, the duration and the sunshine length on the lignification, the drought resistance and the cold resistance of the seedlings, and puts forward some suggestions for the application of the short-day treatment in summer afforestation in China. .