关键词: 出苗质量, 幼苗生长, 种子预处理, 唐古特白刺

Abstract: To explore the way to improve seed emergence quality and seedling growth of Nitraria tangutorum Bobr., the seeds were pretreated with different methods before soaked at 60 ℃ for 24 hours and sowed in pots. Simultaneously, the seeds without pretreatment was taken as the control. The results showed that the emergence rates in all treatments increased in the ‘S’ curve fitted to Logistic equation with emergence durations ranging from the 38th day to 55th day and the utmost germination rates ranging from 30.2% to 57.8%. The seeds rubbed and rolled with sands showed high emergence quality and good seedling growth, whose emergence rate, emergence vigor, emergence index and vigor index increased by 15.6% and 13.4%, 60.1% and 6.9%, 35.2% and 13.2%,41.5% and 23.3%, respectively, as compared with the control. Especially, the seeds rubbed with sands emerged in convergence, which was 5 days earlier than the control. However, the seeds tip-removed, marinated in 20% vinegar and 5% Na2CO3 showed restrained emergence trend. All above reveals that the rubbing and rolling treatments for the seeds mixed with sands may break their solid and compact endocarp structure and break their dormancy, and improve the seeds emergence and grow condition. However, it should be noticed that if operated improperly the rolling may destroy seed internal structure.

Key words: emergence quality, seedling growth, seed pretreatment, Nitraria tangutorum Bobr.