Abstract:The study site was located on the eastern fringe of the Tibetan Plateau where climate warming and enhanced UVB radiation (UVB) were severe.Seed germination,seedlings growth and photosynthetic pigments content of Picea asperata seedlings in the eastern fringe of the Tibetan Plateau were measured to investigate the responses of P.asperata seedlings to climate warming and enhanced UVB using Opentop Chambers (OTCs) and UVlamps.The results showed that:(1)Enhanced UVB radiation did not significantly affect seed germination.However,it significantly inhibited seedling growth,decreased chlorophyll contents,and caused a high seedling mortality of P.asperata (P<0.05).(2)Warming markedly stimulated seed germination,facilitated seedling growth and increased chlorophyll content in needles of P.asperata (P<0.05).(3)Warming alleviated the harmful effects of enhanced UVB radiation on seedling growth and chlorophyll content,and decreased the high mortality induced by enhanced UVB.It could be reasoned that climate warming would alleviate the harmful effect of enhanced UVB on early regeneration of spruce forest.