Study on the Seedling Raising Technique and Seedling Growth Regularity of Picea mongolica in Arid Desert Areas

[Objective]The purpose was to study the seedling raising technique and seedling growth regularity of Picea mongolica in arid desert areas.[Method]The tested seeds were treated by different methods before sowing,the randomized block design with 3 seedbed designs and 3 sowing density was used in seedling raising experiment.[Result]The measures of soaking seeds in cold water before sowing,selecting high seedbed and middle sowing density for seedling raising were favorable to enhancing seedling emergence rate and seedling survival rate and these measures could reduce the incidence rate of disease significantly.The annual growth regularity of seedlings was manifested as follows:its growth of height entered into rapid growth period from Jun.,its growth of ground diameter entered into rapid growth period from Jun.20th,its growth of ground diameter was delayed for about 20 d in comparison with its growth of seedling height,its growth of seedling height and ground diameter tended to be slow till Jul.and stopped till Aug.The correlation analysis showed that the major environmental factors influencing growth of ground diameter and seedling height were lowest temperature,soil temperatures in soil layers of 20,15 and 10 cm.[Conclusion]This study supplied technical support for popularization and planting of P.mongolica in arid desert areas.