Abstract
The longitudinal distribution of radial increment of stems after strong pruning was studied on about 14 years old trees of Pinus densiflora. The ring breadth of strongly pruned trees have been rapidly reduced on the part of stems below the pruned portions. On the stems extremely strongly pruned, the lack of year rings was observed, which have not been disappeared after three years of the treatment. The reduction of radial grow was largest in the first growing season after treatment, and gradually recovered year by year.
