Abstract: Selecting gap disturbance as an important factor in sustaining the dynamic balance of Korean pine broad-leaved forests. the gap-forming manner. its distribution pattern, frequency of gap disturbance, and percentage of gap area in Korean pine broad-leaved forest were Systematically analyzed. The results show that most of the gaps in Korean pine broad-leaved forest are produced by 2 fallen trees, the frequency of gap is 0.92 hm²·yr^l, with a pened of 751 years, the size of expanded gap (EG) and that of canopy gap(CG) are 100～600 and 50～350 m², statistically centralized at 400～500 and 200～250 m², respectively, the area of expanded gaps and canopy openings average 141.82 and 67.63m², respectively.

Key words: Korean pine bread-leaved forest, Disturbance, Gap, Changbai mountains, temporal and spatial variation, MODIS, plant functional type, fraction of absorbed photosynthetically active radiation, filtering of Savitzky-Golay.