The Transition of the Stand Density on Hinoki (Chamaecyparis obtusa) Yield Experimental Plots in Kyushu District

Abstract

The transition of the stand density is studied with high density and old-age yield experimental plots for hinoki (Chamaecyparis obtusa) in Kyushu district. As a measurement for the stand density, tree density, basal area density, relative spacing and a yield index are analyzed. The relative spacing at unthinned hinoki stands is perceived to approach asymptotically to 10%, which is similar to sugi (Cryptomeria japonica) stands. There exist some plots whose density is above the full density curve from the stand density control diagram of hinoki in Kyushu district. This implies a need for reconstruction of the stand density control diagram.