Unravelling the patterns, potential processes and mechanisms underlying biodiversityhas always been a crucial issue in community ecology. It is also a necessary first step for any conservation and restoration to better adapt fragile ecosystems to a changing climate. However, littleis known regarding the structure and maintenance of plant communities in typical high-altitudewetlands. Here, we made a comprehensive analysis of the diversity and composition of wetlandplant communities based on the distribution of plants near the shorelines of 19 lakes across theQinghai-Tibetan Plateau. The latitude, mean annual temperature (MAT) and mean annual precipitation (MAP), along with the edaphic properties, were the dominant predictors affecting the taxonomic and phylogenetic α-diversity. Besides diversification, ecological drift, mixing with weak dispersal and weak selection shaped the community composition of wetland plants in our study. Thelatitude and MAP predictors, although modest, showed an impact on the community structure
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