In this paper, Two-way indicator species analysis (TWINSPAN) and canonical correspondence analysis (CCA) were used to reveal the main shrub types and their distribution patterns in southeast Tibet, and the dominant environmental factors affecting their structural differentiation were discussed and analysed. The results showed that: (1) TWINSPAN quantitative classification divides the shrub system in southeast Tibet into 12 formation types, the 12 formation types include evergreen conifer forest shrub, evergreen leather shrub and deciduous broadleaf shrub; (2) CCA ordination shows that the main environmental factors affecting the distribution of shrub formation in southeast Tibet are altitude, slope direction, average temperature and average rainfall, followed by latitude and longitude and coverage; (3) The combination of TWINSPAN classification and CCA ordination reflects the relationship between the variation of shrub distribution pattern and environmental factors, which can provide reference for the protection and sustainable utilisation of shrubs in southeast Tibet and the study of related vegetation formations.
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