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<p>Exploring the characteristics of plant composition and diversity under different water level gradients in the water level fluctuation zone of reservoirs in alpine regions will be beneficial for screening suitable species during the restoration process of the water level fluctuation zone. Longyangxia reservoir was used as the subject of this study, and species surveys were conducted in its water level fluctuation zone to clarify the composition, distribution and diversity characteristics of plants in the area. The results showed that there were 33 plant species in the water level fluctuation zone of the Longyangxia reservoir, which belonged to 11 families and 30 genera. Herbaceous species dominated (97%), and annual herbs (16 species, 48.5%) were the main dominant life type, with more plants in the families of Fabaceae, Asteraceae, Poaceae, and Amaranthaceae plants. Among the 33 plant species found in the reservoir’s water level fluctuation zone, those with a frequency of occurrence &gt; 40% were <i>Salsola collina</i>, <i>Agriophyllum pungens</i> and <i>Setaria viridis</i>, while 81.8% (27 species) had a frequency of occurrence &lt; 10%. The flora composition is predominantly characterized by widespread families and genera. Furthermore, the diversity indices (Species richness, Shannon-Wiener diversity index and Simpson index) all showed an increase with increasing water levels. Cluster analysis based on the importance values showed that the most frequently occurring plant communities in the study area were <i>Agriophyllum pungens</i> + <i>Salsola collina</i> community, <i>Salsola collina</i> + <i>Setaria viridis</i> + <i>Medicago lupulina</i> community and <i>Agriophyllum pungens</i> + <i>Setaria viridis</i> + <i>Persicaria lapathifolia</i> community.</p>

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Plant species diversity in the water level fluctuation zone of an alpine region: Longyangxia reservoir as a case study

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Qin Yu,
  • Jinyuan Chen,
  • Qi Li,
  • Xiaomei Kou,
  • Long Li,
  • Baicheng Niu

摘要

Exploring the characteristics of plant composition and diversity under different water level gradients in the water level fluctuation zone of reservoirs in alpine regions will be beneficial for screening suitable species during the restoration process of the water level fluctuation zone. Longyangxia reservoir was used as the subject of this study, and species surveys were conducted in its water level fluctuation zone to clarify the composition, distribution and diversity characteristics of plants in the area. The results showed that there were 33 plant species in the water level fluctuation zone of the Longyangxia reservoir, which belonged to 11 families and 30 genera. Herbaceous species dominated (97%), and annual herbs (16 species, 48.5%) were the main dominant life type, with more plants in the families of Fabaceae, Asteraceae, Poaceae, and Amaranthaceae plants. Among the 33 plant species found in the reservoir’s water level fluctuation zone, those with a frequency of occurrence > 40% were Salsola collina, Agriophyllum pungens and Setaria viridis, while 81.8% (27 species) had a frequency of occurrence < 10%. The flora composition is predominantly characterized by widespread families and genera. Furthermore, the diversity indices (Species richness, Shannon-Wiener diversity index and Simpson index) all showed an increase with increasing water levels. Cluster analysis based on the importance values showed that the most frequently occurring plant communities in the study area were Agriophyllum pungens + Salsola collina community, Salsola collina + Setaria viridis + Medicago lupulina community and Agriophyllum pungens + Setaria viridis + Persicaria lapathifolia community.