earticle

영어

The zonal climax in humid temperate areas in East Asia is the Primary Mixed Forest of Korean Pine and Broadleaved Tree Species and most of them has been derived into secondary forest currently. Many of the secondary forest has become the mixed forest by artificially planted Korean pine and naturally regenerated broadleaved leaved tree species through the dynamic management approach of “planting conifers and reserving broadleaved tree species” in Northeast China’s temperate forest region. For promoting the growth of Korean pine trees and broadleaved trees harmoniously, microspace of individual trees of Korean pine was quantitatively regulated according to Opening Degrees (OP=1.0, 1.5 and 2.0) and the morphological development of Korean pine trees was elucidated by long time positioning investigation from 12 sample plots in 3000 m2 in University Forest of Northeast Forestry University at Maoershan, which is located in Maoershan Town, Shangzhi City, Heilongjiang Province, China. The results were shown as follows: (1) the ratio of lower 2 wheel lateral branch base diameter to diameter at breast height (BBD/DBH) could be the indicator of under canopy Korean pine tree light environment, the smaller the better; (2) the response patterns of height, diameter, crown width and individual tree volume of different age-class Korean pine trees to each OP were different, OP=2.0 was significantly better than other two OPs for 30-year-old and 15-year-old Korean pine populations but no certain pattern for that of 9-year-old Korean pine population, especially, the individual volume of Korean pine trees in OP=2.0 were 197% and 113% higher than that of OP=1.0 and 1.5 respectively for 30-year-old population and 212% and 343% for 15-year-old population but no evident changes for 9-year-old population; ten year data of height, diameter and individual volume showed the same patterns; (3) 28.2% Korean trees in OP=2.0 for 30-year-old population has reached to the upper tree canopy height but only 4.1% and 1.1% for other two OPs. Conclusion: Opening degree 2.0 treatment for Korean pine tree was the proper one that could promote fast growth of under-canopy planted Korean pine trees.