A study on niche of moss species on the floor in main ecological systems in Changbai Mountains
长白山主要生态系统地面藓类植物的生态位研究

The niche overlaps of 42 moss species in 41 sites in the main ecological systems in Changbai Mountains were calculated by Wang's equation.Two\|dimensional scatter plot of principal axes analysis(PAA),systematic cluster tree and the minimal spanning tree on the basis of niche overlaps were drawn,which revealed the ecological similarity of 42 moss species.The combinative application of principal axes analysis,systematic cluster analysis and minimal spanning tree method on the basis of niche overlaps could express the ecological similarities among species intuitively.The studies showed that three groups of moss species,which include Larix olgensis\| bog moss,turdra moss, Betula ermanii forest and dark conifer forest moss,could be identified based on their niche overlaps.Among 42 moss species,the relationship between niche breadth with species number was obtained.It indicates that most moss species on the floor of main ecological systems in Changbai Mountains have narrow niche breadth.