Abstract:

Recovery course of the planted young trees of Pinus koraiensis under the natural secondary forest were studied. The main reason for the feeble growth of the young Korean Pine was the environmental condition. At the young stage of Korean Pine, different environmental conditions were required. It has been found that release cutting could regulate the stand structure and ameliorate the environmental condition, so the growth of the young Korean Pine could be recovered. Besides, a series of stand structure parameters, such as neighborhood comparison (U), mingling (M) and neighborhood pattern (W), was induced to technical indexes. So the growth of the young Korean Pine, and the mixing as well as the distribution of its closest 4 neighboring trees can be expressed quantitatively. Results indicated that, when the young Korean Pine was to be dominant tree, neighborhood comparison (U) would be 0 or 0.25, the neighboring trees of it were medium mixture and randomly distributed, mingling (M) would be 0.5, and neighborhood pattern (W) would be 0.5.

Key words: natural secondary forest, artificial regeneration under canopy, young trees of Pinus koraiensis, spatial structure, parameters expression, stand structure regulation