Abstract
Ikenotani watershed of Kyoto University Forest in Ashiu is a young natural Sugi (Cryptomeria japonica) mixed stand. Various improvement cutting were performed in this area about 16 years ago. Considering the stand structure, we evaluated the effect to stand dynamics by different improvement cutting. The upper and middle layer cutting promoted the growth of valuable trees in canopy and including broad-leaved trees, consequently. On the other hand, lower layer cutting promoted the recruitment of saplings of Sugi. The significance of new improvement cutting methods corresponding to slope is emphasized.
