Relationship Between Community Structure of Wild Fruit Forests and Their Environment on North-facing Slopes of the Iri Valley

The quantity relationship between the plant community of the wild fruit forests,which were located on the north-facing slopes of the Iri Valley,Xinjiang,China,and environment factors was discussed based on the detailed habitat data from the wild plant investigation.The results of TWINSPAN and Detrended Canonical Correspondence Analysis showed: 1) On the north-facing slopes of the Iri Valley,landform,nutrient and water were the basic factors of community habitat;2) Effect of altitude showed the basic differentiation of plant communities in research area,which indicated the altitude condition was the most important factor constraining the community distribution in northern wild fruit forests;3) The close relationship between altitude and water in soil surface reflected the water influences on herbage-layer communities;4) The nutrient differences in current community habitat implied not only the differences among factors themselves but also present nutrient conditions affected seriously by people to some extent.Above all,the environmental differences were very obvious in complicated mountain area,and the combination of altitude,soil water content,total nitrogen,slope and pH affected and controlled the community distribution of research area.