Effectiveness of the Canopy Closure Curve to Inform Management of Two-Storied Stands

In this study we examined the validity of canopy closure curve as a reference in relation to light conditions and demonstrated applicability different thinning types. An even-aged sugi (Cryptomeria japonica) plantation 91 years was thinned heavily transformed two-storied stand by underplanting with hinoki cypress (Chamaecyparis obtusa) seedlings. Three initial sample plots were selected before thinning. After conversion, five permanent established both overstory understory trees measured up age 118 28 years, respectively. The estimated from measurements collected crown density (i.e. ratio productivity maximum productivity) calculated based on reference. To validate curve, derived three time points plots: one when trajectory stem volume intersected relationships between individual their growth changed, point dropped. first these coincided second third points. This means that dominant suppressed smaller constrained because reduction closed. found be valid way assess controlling trees. Furthermore, generated virtual data taken for We obtained these. plotted well demonstrate curve. simulation showed sufficient effect there no need additional accretion cutting.