Research on the Stand Structure Adjustment Technology of Natural Broad-Leaved Mixed Forest

Regenerated under the different canopy densities of natural broad-leaved mixed forest used different regenerated densities and different regenerated tree species.Investigated the fixed standards for two consecutive years and obtained the conclusions:the best regenerated densities of Korean pine were 2000 tree/hm2 and the Spruce were 3300 tree/hm2,the best regenerated tree species in canopy density between 0.3 and 0.5 were Korean pine,Spruce was the better tree species in the stand whose canopy density was less than 0.3,the stand should be regenerated after thinning or tending whose canopy density was more than 0.5,because the growth of any tree species in this stand were not dominate.Pinus banksiana was not suitable for regenerating under the natural broad-leaved mixed forest because it was not shade-tolerant tree species and low retention ratio though the increments were higher.

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