定苗时间对峦大杉1年生苗木生长的影响

探究定苗时间对峦大杉苗期生长动态与生长节律影响,优化定苗时间,为育苗提供理论与技术支持。以当年生峦大杉幼苗为试验材料,开展不同定苗时间试验,采用定株观测并应用Logistic方程拟合生长动态的方法,分析定苗时间对苗木生长动态和生长节律的影响效应。研究结果表明,定苗时间影响苗高地径生长效应随处理时间推移而显现,是个动态过程。Logistic方程能够很好地拟合峦大杉苗木生长。定苗时间显著影响苗高、地径线性生长速率、最大线性生长速率和线性生长量,但对苗高地径线性生长始期、终期、线性生长持续期无显著性影响;苗高生长初期定苗较其他处理显著提高苗高和地径的线性生长量线性生长速率、最大线性生长速率,建议增加速生期的养分和水分供给以提高苗木质量。峦大杉合理定苗时间是苗高生长初期（6月30日）。

Effects of Final Singling Time on Growth of One-year-old Seedlings of Cunninghamia konishii

Aiming to explore the influence of final singling time on growth dynamics and growth rhythm of Cunninghamia konishii seedlings, optimize final singling seedling time, and provide theoretical and technical support for seedling cultivation, the experiment of final singling time of C. konishii was carried out with annual seedlings. The effects of final singling time on seedling growth dynamics and growth rhythm were analyzed by using the method of fixed plant observation and fitting seedling growth dynamics with Logistic equation. The results showed that the effect of final singling time on seedlings height and ground diameter growth appeared with the time, and it was a dynamic process. Logistic equation fitted well the growth dynamics of C. konishii seedlings. Final singling time significantly affected the total linear growth, the linear growth rate and the maximum linear growth rate of seedling height and ground diameter, but had no significant effect on the linear growth beginning days, linear growth final days, and linear growth duration of seedling height and ground diameter. Final singling time at initial stage of seedling height growth significantly increased the total linear growth, the linear growth rate and the maximum linear growth rate of seedling height and ground diameter compared with other treatments, and increasing the nutrient and water supply in fast-growing stage could improve the seedlings quality. The reasonable final singling time of C. konishii is at the initial stage of seedling height growth (June 30).