Abstract:

Plant communities in the water-lever-fluctuation zone of Three Gorges Reservoir were studied. The study area was divided into five regions according to the changes of water level. The species diversities and gradient variation of plant communities in the water-lever-fluctuation zone of Three Gorges Reservoir were measured by α-diversity index and β-diversity index. The results showed that there were the 298 species of vascular plants belonging to 82 families and 175 genera in all plots. Dominant species had obvious difference among different regions in the study area. The Shannon-Wiener, Simpson and richness indices of the communities generally increased with the altitude increasing, while Pielou diversity showed different variation pattern from the richness index, and β_T and C_N diversity index presented opposite trend.

Key words: Three Gorges Reservoir, Water-level-fluctuation zone, α-diversity, β-diversity

摘要：

以三峡库区典型区域的消落带植物群落为研究对象，通过对区域内5个不同海拔段的植物群落进行样方调查，采用α多样性指数及β多样性指数进行测度，探讨该区消落带水淹梯度上的物种组成、多样性变化规律。结果表明：共有298种维管植物，隶属于82科175属，种类较少；优势种组成变化明显，Shannon-Wiener指数、Simpson指数和物种丰富度指数总体均表现为随海拔升高而升高，均匀度指数则表现为先降低后升高的趋势；β_T与C_N随海拔升高呈基本相反的变化趋势。

关键词: 三峡水库, 消落带, α多样性, β多样性