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    Within the optimization framework of forest stand management, a new dynamic programming algorithm is proposed to search for an optimal thinning regime. While the ordinary algorithm for dynamic programming searches for an optimal thinning regime in one direction, i.e., forward or backward recursion, the proposed algorithm applies two-directional look ahead search. Constructing a dynamic programming model with the proposed algorithm for sugi (Cryptomeria japonica) forest stands in the Kyushu region, Japan, we investigate an effect of the proposed algorithm under the current thinning subsidy policy in Japan. A forest stand growth simulator used in the proposed dynamic programming model is based on the stand density management diagram. Our results show that when there is heavy dependency of the future growth on the previous thinning activities, the proposed algorithm outperforms PATH and MS-PATH algorithms.
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