Estimation of Merchantable Volume Ratio by Major Species
2016
Son, Y.M., National Institute of Forest Science, Seoul, Republic of Korea | Kang, J.T., National Institute of Forest Science, Seoul, Republic of Korea | Won, H.K., National Institute of Forest Science, Seoul, Republic of Korea | Jeon, J.H., National Institute of Forest Science, Seoul, Republic of Korea
This study was conducted to derive merchantable volume ratio for 5 major species such as Pinus Densiflora (Central Region). The data used for this study was from at least more than 1,300 trees of research data throughout the country. the study applied two estimation equations, which were the estimation equation for wood volume ratio representing total wood volume to total tree stem volume and the estimation equation for merchantability representing ratio of merchantable volume to total wood volume. The merchantable volume ratio was derived by multiplying those two estimation equations. In order to gain wood volume ratio(W) from DBH, W = a 1 1 + a 2 / D + b 1 1 + b 2 / D model was used. Fitness index of it was more than 99% by species, and other test statistics also indicated the suitability of this equation enough. Merchantability (M) for wood volume applied M = e a 1 d D a 2 − b 0 + b 1 D + b 2 D 2 + b 3 D 3 model and fitness index was more than 96% by species. Merchantable volume ratio was assessed using those two estimation equations by each 5 species, and constructed a merchantable volume ratio table. In result, merchuntable volume ratio was little difference between stand types, but there was slightly different with the existing standard such as conifers of 85% and non-conifers of 70%.
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