A Dynamic Programming Algorithm for Optimization of Lodgepole Pine Management

Single-tree/distance-independent stand simulators can be adapted for dynamic programming (DP) optimization of thinnings and rotation age. Efficiency requires classification of trees for all but very short tree lists. Thinning types in conjunction with discrete basal-area, number-of-trees, and age classes define a DP network that allows the comparison of yields from more thinning regimes that have wider differences in sequences of diameter distributions than do networks without the thinning type dimension. Methods and results are demonstrated for a lodgepole pine ( Pinus contorta Doug. ex Loud.) simulator developed for Central and Eastern Oregon. Optimal management regimes developed with and without quality premiums produce stands with high vigor indices and high resistance to attack by mountain pine beetle ( Dendroctonus ponderosae Hopkins), suggesting that stocking control can be used to simultaneously maximize both net discounted revenue and insect resistance. However, managing stands with a maximum diameter limit to prevent attack substantially reduces net revenue when market premiums exist for large diameter trees. Forest Sci. 31:321-330.