1. Light intensity influenced significantly involucrum, which distributed in the canopy with the relative light intensity hither than 13 % of 8-year-old boos trees 10% of 15-year-old trees.
2. Light intensity influenced significantly involucrum, which distributed in the canopy with the relative light intensity hither than 13 % of 8-year-old boos trees 10% of 15-year-old trees.