桫椤物候研究

A Phenological Study on Cyathea spinulosa.

桫椤(Cyathen spinulosa)这一珍稀孑遗植物,近年来在形态、解剖、生态等方面均有不同程度的研究。但就其物候学方面却无人涉足,为此,我们于1987年起对桫椤进行了连续两年的物候观测。

Two years site observations on the leaf and spore phenology of Cyathea spinulosa revealed that the mean annual amount of leaf sprout per plant is 33. The sprouting begins in early March and peaks in May any September, with a mean leaf sprout of 5.2 per plant. Dormant period begins in early November and ends in early March. The starting air temperature for leaf growth is around 12℃ ,and favorable temperature is around 21℃. Sporecysts of Cyathea spinulosa appear in early May and matures and disperses in early July. The annual production of spores is 1-19.2 billion per plant.