楓樹幼枝形成層季節性活動之研究

Seasonal activity of the cambium in the young branch of Liquidambar formosana Hance

Seasonal activity of cambium has been investigated in Liquidambar formosana Hance, which is a subtropical deciduous tree in Taiwan. Cambial activity is affected mostly by temperature. It is initiated in late March, and as temperature increases it increases in activity until July and then slowly declines and ends in October. Phloem differentiation precedes xylem differentiation by approximately a month. Rainfall and relative humidity possibly have little effect on cambial activity. In view of its relation with phenology, it seems that there is a correlation between actively growing buds and the initiation of cambial activity.