LAUSR

. This study primarily employs the Twin Classification (TWINSPAN) and Canonical Correspondence Analysis (CCA) to investigate the original forest population types and distribution patterns in Southeastern Tibet. It also explores the main environmental factors causing structural variations in these forests. The results indicate the following: (1) Using TWINSPAN, the forest system in Southeastern Tibet was classified into eighteen community types. (2) Detrended Correspondence Analysis (DCA) and CCA ordination reveal that elevation, aspect, and slope are the primary environmental factors influencing the distribution of forest plant communities in Southeastern Tibet. (3) The TWINSPAN classification results, along with the conclusions from DCA and CCA ordination, illustrate the evolving spatial patterns of forest communities and their interactions with key environmental factors. This study provides a foundation for research on the conservation and sustainable development of forest communities in Southeastern Tibet, as well as relevant assessments of plant populations.