沙地云杉育苗技术及苗木年生长规律研究

Breeding techniques and annual growth rhythm of Picea mongolica seedlings

采用不同做床方式、不同播种密度 ,夏季苗床不同遮荫方式等方法研究了沙地云杉育苗技术及其年生长规律 .结果表明 :适时早播有利于苗木地径、苗高、苗木质量的提高 ;单层和双层遮荫对幼苗生长影响不大 ,但适当遮荫有利于幼苗生长 ;条播、使用菌根粉的苗木明显优于撒播、不使用菌根粉的苗木 .而苗木年生长规律研究表明 :苗木地径和苗高的年生长规律基本相似 .从 6月下旬开始随着气温的增高 ,高生长呈直线稳步上升 ,地径的生长也不断加快 ,在 7月中旬达到苗高生长的最高峰 ,而地径的生长期比高生长期长 ,在 8月中旬才达到最大值 ,尔后进入硬化期 ,苗木地上部分逐渐木质化 .通过相关分析发现 ,影响地径和苗木生长的主要因子分别为地面温度、地面最高温度、1 5cm土壤温度和地面温度、地面最高温度以及 2

Based on different treatments that had been used, this paper studied the breeding techniques and annual growth rhythm of the Picea mongolica seedlings. The results show that appropriate earlier sowing, drill sowing and using mycorhiza help to increase the ground diameter, the height, and the quality of the seedlings, but different shading ways have no obvious effect on the growth and quality of seedlings. The annual growth rhythm of ground diameter is nearly the same as that of the height. From late June, the seedling height and ground diameter grow quicker and quicker. The seedling height reaches the maximum in middle July. But the growth of ground diameter has a longer growth period and reaches the maximum in middle August and then comes into hardening period. The principal factors, which affect the growth of ground diameter and seedling height, are ground temperature, ground maximal temperature, soil temperature at 15 cm depth and ground temperature, ground maximal temperature, soil temperature at 20 cm depth respectively.