To probe the effects of snowmelt time on propagules and seedlings of Fritillaria unibracteata Hsiao et K.C.Hsia,three melting portions(early melting,medium melting and late melting) were established along snowmelt gradient in an alpine snowbed in eastern Tibetan Plateau.At each portion,seed mass,seed set per flower,weight per bulb,seed germination rate and length of first leaf were measured.Furthermore,comparison was performed among the portions.The results showed that seeds per flower and seed mass at late melting portion was increased by 40.3％ and 24.6％,respectively,comparing with those at early melting portion.However,average weight of bulb was decreased by 22.4％ compared with that at early melting portion,showing a contray trend in seeds per flower and seed mass.In addition,seed mass did not affect seed germination rate evidently,whereas it exerted a strong influence on the first leaf of seedlings.Compared with early melting portion,length of the first leaf of seedlings at late melting portion was increased by 41.6％,indicating that seed mass was closely related to seedlings' fitness.It was conclude that late melting snow was beneficial to production of seeds,while early melting snow was helpful for growth of bulb.
Fritillaria unibracteata Hsiao et K.C.Hsiasnowmelt timegrowthimpact
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