关键词: 高寒草地, 遮荫, 狼毒, 种苗定居

Abstract: Shading is a crucial environmental factor that influences plant seed germination and seedling establishment. This study aimed to investigate the impact of shading on Stellera chamaejasme seedling settlement in alpine grassland. Artificial control experiments were carried out in natural habitat to explore the emergence and seedling settlement performance of S. chamaejasme seeds under different shading heights (10 cm,15 cm and 20 cm) and orientations (east,west,south and north).The results revealed that various shading treatments significantly reduced surface soil temperature(P<0.05) and increased soil water content in alpine grassland(P<0.05). Different shading treatments reduced in varying degrees of reduction in the germination rate and seedling establishment rate of S. chamaejasme seeds. Compared to the control group,shading treatments in the east,south and north did not significantly affect the germination rate of S. chamaejasme seeds,whereas shading treatment in the west significantly reduced the germination rate of S. chamaejasme seeds (P<0.05). The seedling establishment rate of S. chamaejasme did not significantly differ among various shading treatments,with all treatments achieving 100% establishment.The analysis showed that shading was an important environmental factor affecting the settlement of S. chamaejasme seedlings. Therefore,maintaining the alpine grassland plant community at a certain height level can effectively curb the settlement and population dispersal of S. chamaejasme seedlings.

Key words: Alpine grassland, Shade, Stellera chamaejasme, Seedling settlement