Effects of Sap Collection on Trees Growth in Acer mono of Mt. Jiri

摘要

Closing processes of tapping holes and diameter growth of tapped trees of Acer mono were investigated to understand the effects of sap tapping and number of tapping holes on tree growth and closing speed of holes. Closing processes of tapping holes were faster at trees tapped of ten holes than trees tapped of one, three, five holes during the study period, and tapped holes were completely filled up within 15 months. Diameter growth by number of tapped hole were 0.54 mm for control trees, 0.60 mm fortrees tapped of one hole, 0.64 mm for trees tapped of three holes, 0.33 mm for tapped of five holes and 0.31 mm for trees tapped of ten holes, respectively. Closing processes of tapping holes by fusion materials was fast in the order of DB ointment, stirofoam, control and bamboo vinegar. Especially, tapped holes in the case of DB ointment was completely healed within 4 months. Therefore, DB ointment should be used to minimize damage on tree growth and secure resources for sap collection of A. mono.