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We developed a cross-cuuing pattern aigorithrn to maximize the stumpage price of each diameter class of timbe4 depending on market prices, and applied it te Sugi (Cmptomen'a 1'aponica) plantations in Gunma Prefecture, Japan. We used a relativetaper curve and a relative height-diaineter cu ve to estimate taper by diameter at breast height class. Using this algorithm, we estimated the optimurn cross-cuhing pattern method based on Sugi log prices at different points in time. The optimum cross-cutting pattern allows the stumpage price to rise more dramatically than by the fiuctuatien of log prices alone. During 6 menths, which is a relatively short peried of time when considering market conditions, an ebvious difference in optimum cross-cutting pattern was cenfirmed; in some cases, a focus en 3.65-m logs was beneficial, whereas in other cases, 4-m logs produced greater benefits. The difference accords with the prospective cross-cutting pattern considered profitable by the Gunma Forest Asseciation. This result indicates that the algorithm can estimate optimum cress-cuding patterns according to changes in the timber market without contradicting empirical rules, Keywotzts/ cross-cuhing pattern, stumpage price, timber market

journal of forest planning

Development and Application of an Algorithm to Calculate Cross-cutting Patterns to Maximize Stumpage Price based on Timber Market and Stand Conditions : A Case Study of Sugi Plantations in Gunma Prefecture, Japan