Abstract: Taking the original broad-leaved Korean pine forest in Changbai Mountain of Northeast China as test object, and by using density-dependent matrix model, this paper simulated the temporal dynamics of diameter distribution of the stand under natural growth scenario, analyzed the effects of a selection harvest scenario on the diameter distribution, and calculated the recover periods of seven harvest scenarios. The  forest was relatively stable, but still had a slow natural growth. The stand density declined, which accorded with the self-thinning law of forest. The change rate of the tree number of each diameter class weakened gradually over time, and the stand density became relatively fixed, which validated the theory of succession climax. Based on the indices for assessing the effect of forest management, including harvest level, structure of preserved stands, and harvest cost, it was considered that, 20% harvest intensity with an interval of 35 years and 25% harvest intensity with an interval of 45 years would be the two of the most optimal harvest scenarios.

Key words: Magnetized soil, Brassica napus, Physiological and biochemical index, Soil-health quality