Abstract: The relationships of eight moss species of Dicranum in 31 sites in main ecological systems in the Changbai Mountain with environmental factors were studied by canonical correspondence analysis(CCA). The results showed that altitude, soil sand percentage, water percentage, acidity and canopy density were important environmental factors influencing the distribution of the species of Dicranum. The relationships between Dicranum elongatum Schleich. ex Schwaegr., D. groenlandicum Brid. and altitude,between D.japonicum Mitt., D. scoparium Hedw. and canopy density,between D. polysetum Sw., D. undulatum Schrad. ex Brid. and soil acidity and water percentage,were positively correlative. The niche overlaps among the eight species of Dicranum were calculated. The minimal spanning tree of the eight species on the two-dimensional scatter plot were also drawn based on their niche overlaps, which clearly revealed the ecological similarities of eight species.

Key words: Camellia azalea, population structure, distribution pattern, aggregation intensity.