融雪时间对川贝母个体特征和物候阶段的影响

Effect of Snow Melting Time on Individual Characteristics and Phenology of Fritillaria unibracteata

[目的]探讨融雪时间对川贝母生长和物候的影响。[方法]在青藏高原东部的一个高山雪床,在积雪早融部位与积雪晚融部位之间进行川贝母移植试验,观察川贝母的个体特征和物候的变化。[结果]川贝母的株高、单叶面积和地上生物量在早融与晚融部位之间有显著的差异,且晚融部位的值要大于早融部位的值;融雪时间对川贝母早期和中期物候阶段(如开始生长期、始花期)有影响,而对后期特别是晚期的物候阶段(如植株枯黄期)影响很小。[结论]积雪晚融的环境更有利于川贝母的生长,在人工种植中应遵循这一规律。

[ Objective ] To discuss effect of snow melt time on characteristics of growth and phenology of Fritillaria unibracteata. [ Method ] In an alpine snow bed on the eastern Tibetan Plateau, the transplant test was carried out between early-meltlng portion and late-melting portion of Fritil- laria unibracteata. Characteristics of individual and phenology of Fritillaria unibracteata were observed. [ Result ] Height, area per leaf and aboveground biomass of Fritillaria unibracteata in late-melting portion were significant higher than those in early-melting portion. Snow melt timie showed a strong influence on early phenological phases like plant emergence and first flowering,while it presented a weak influence on late pheno- logical phases such as consenescence. [ Conclusion] It was more advantageous for Fritillaria unibracteata to grow in late-melting habitats than in early-melting locations,which should be followed in artificial cultivation of Fritillaria unibracteata on Tibetan Plateau.