Quantitative Classification and Ordination of Alpine Desert Plant Communities in Northwest Xizang
In order to investigate the type and distribution of alpine desert plant communities in the northwest of Xizang,we set out to determine the environmental factors affecting their distribution,hoping to provide a theoretical basis for the protection and restoration of alpine desert communities in northwestern Xizang.Using the two-way indicator species analysis(TWINSPAN)and canonical correspondence analy-sis(CCA)methods,we conducted a statistical analysis on 136 sample plots in northwestern Xizang.The results showed that:(1)a total of 131 vascular plant species were recorded in 136 sample plots,belonging to 27 families and 67 genera,in which dicotyledons dominated;In the study area,Asteraceae,Fabaceae,Poaceae,Rosaceae and Cyperaceae were the dominant plant families.(2)TWINSPAN quantitative classi-fication divides the alpine desert plants of northwestern Tibet into 22 clustered communities,with a prepon-derance of dominant species named after herbaceous plants.(3)CCA ordination indicates that the primary environmental factors affecting community distribution are longitude and latitude,followed by altitude.The CCA ordination further clarifies that the alpine desert plant communities in the northwest of Xizang exhibit a distinct horizontal zonal distribution pattern overall.
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万方数据
