不同海拔梯度下椭圆叶花锚种子的萌发对策

Seed germination is a crucial stage for seedling recrument,individual development and community construction.Most annual plants can only rely on the seeds to continue race,and there is only one chance for reproduction.So studies on the germination of the seeds from one single species in different altitude gradients can understand the survival strategies for species under different environments.The seeds of Halenia elliptica D.Don from 6 different altitudinal ranges in Qinghai Tibet Plateau were studied.The results showed:(1)There was significant positive correlation between germination percentage and altitude.On the whole,the seed of Halenia elliptica D.Don had low germination percentage.Seeds from higher altitudes displayed higher germination percentages.The highest altitude had the highest germination percentage which was 74.94%, and the lowest altitude had the lowest germination percentage which was 5.49%.(2) Along altitude gradient,the days to first germinate was usually long,the seed germinated discontinuously,germination period was relatively long and their germinate speeds were slow.With altitude increasing,the days to first germinate reduced,germinate rate behaviored slower and germination period increased.The germination characteristics showed that the survival strategy had adapted to the complex and changeable Qinghai Tibet Plateau.