2015 Effects of Thinning on Stand Structure and Diameter Growth in Old and Overcrowded Japanese Cypress Chamaecyparis obtusa Stands. J Jpn For Soc 97: 182 185 We investigated the effects of tree thinning on stand structure dynamics and diameter growth in two old and overcrowded Japanese cypress Chamaecyparis obtusa stands over an-year period after thinning. One stand was subjected to canopy thinning and the other to suppressedtree thinning. The density of high-quality trees was trees ha in both stands after thinning, but in the stand that had been thinned of canopy trees the density of low-quality trees was still high. Height-to-diameter ratio decreased in the stand subjected to thinning of suppressed trees, whereas it increased in the stand subjected to canopy tree thinning. The annual relative diameter growth rate after thinning ranged from year to year and was to better than that before thinning. There are therefore cases in which thinning increases diameter growth, even in old and overcrowded stands.
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