关键词: 洛川县, 苹果, 土壤水分

Abstract: 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.

Key words: Luochuan County, apple, soil moisture