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AGE STRUCTURE OF MAIN TREE SPECIES IN COMMUNITY OF TILIA BROADLEAF KOREAN PINE FOREST ON NORTHERN SLOPE OF CHANGBAI MOUNTAINS Distribution patterns of main tree species in Tilia broadleaf Korean pine forest on northern slope of Changbai Mountains Physiological regulation of potassium in sink-source distribution of tobacco Evaluation of a sustainable forest utilization program for broadleaved Korean pine mixed forests in the Changbai Mountain region of Northeast China