Stand classification for natural selection forestry in the Tokyo University Forest in Hokkaido

Abstract

Stand classification is an essential technique in the Tokyo University Forest in Hokkaido, because it serves as the basis for spatial forest management planning. In order to understand the operational criteria on how stand classification has been made, we compared structures of species and tree size between selection cutting stand and supplemental planting stand. 19 sample plots established in sub-compartments 108C and 109C in 2002 for estimating standing volume of trees were used for the analysis. The key findings derived from this study are as follows: 1) The mean number and growing stock of conifers in selection cutting stand were significantly larger than those in supplemental planting stand. 2) The number of conifers (≥ 5 cm in DBH) were ≥ 150 stems/ha in selection cutting stand, whereas < 150 stems/ha in supplemental planting stand. 3) In all DBH classes, the number of conifers in selection cutting stand was significantly larger than that in supplemental planting stand. Results indicate that the number of conifers may be a major indicator for distinguishing selection cutting stand from supplemental planting stand. The size structure of conifers should be well-balanced to be classified as selection cutting stand.