Study on character of annual seeds yield, soil seed bank and seedling recruitment of Seriphidium transiliense

Seriphidium transililense seeds yield was observed for three years (2007－2009), and the character of soil seed bank and seedlings recruitments were analyzed. The result showed that fence and climate affected seed yield of seeds. Seed yield inside fence is higher than outside fence significantly, and fluctuating of seed yield is more acutely in different years because of climate change, and shows 200720092008. Seed yield and weight of single S.transililense seedling are very sensitive to fence and climate change, and have significant difference inside, outside fence and in different years（P0.01）, the seed mode does not change significantly. The seed germination rate has significant difference（P0.01）, but there is no difference between years（P0.05）. The germinable seeds of soil seed bank have dramatic changes and have significant differences in the annual and fences inside and outside, seedlings emergence quantity inside fence is larger than outside, but there is no significant difference in three years. The survival rate of seedlings is very low in three years and inside, outside the fence, but fences can significantly increase seedling survival rate. The conversion rate of every stage is relatively low from seed, soil seed bank, seedlings to seedling recruitment, the life story of S. transililense showed significant r strategy.