earticle

영어

This study was carried out to predict and compare the merchantable volume by using two kinds of methods through ratio equations and taper models. To develop the merchantable volume model, the 131 stemmed sample trees were used as the data collected from the Korean red pine (Pinus densiflora), Korean white pine (Pinus koraiensis), and Japanese larch (Larix kaempferi) stands in Gangwon and North Gyeongsang provinces of South Korea. For volume ratio equations, general ratio forms and exponential ratio forms were used to predict merchantable volume up to any top diameter or top height. For stem taper models, well-developed Demaerschalk, Max & Burkhart, Kozak, Muhairwe, and Lee models were applied to predict merchantable volume up to any top height. The best equation was general ratio form for estimating up to any top height and exponential ratio form for estimating up to any top diameter according to the fit statistics and residual plots. Also, Kozak and Muhairwe models were shown as the best models for estimating up to any top height. Using the best models, estimated volumes were applicable with small RMSE. In addition, when comparing the predicted volumes between ratio form and taper model, it was not largely different. Consequently, two types of prediction were reasonable, and ratio form was considered to be more useful because of the convenience in the field.