消落带作为特殊的季节性水陆交错湿地生态系统，具有拦截泥沙和消纳面源污染物等重要功能。于2023年6月，在四川省眉山市黑龙滩水库消落带，采用野外样带调查和双向指示种(Two-way indicator species analy-sis，TWINSPAN)分类方法，定量分析水库消落带植物群落类型及分布现状。研究结果表明，黑龙滩水库消落带种子植物共有16科29属32种，多以一年生草本植物为主;植物区系表现为适应区域气候的热带、北温带植物区系特点;随着水位升高，消落带多年生草本植物的物种重要值增大，而一年生草本植物的物种重要值逐渐减小;黑龙滩水库消落带植物群落主要有10种，其中出现最多的分别为狗牙根(Cynodon dactylon)群落、苘麻(Abutilon theophrasti)群落、喜旱莲子草(Alternanthera philoxeroides)群落、翅茎灯芯草(Juncus alatus)+长芒稗(Echinochloa caudata)群落。黑龙滩水库消落带现存优势物种和优势群落的分布主要受淹水深度、时长和频次的影响，植物群落特征在不同水位差异显著。
Distribution Characteristics of Plant Communities in the Water Level Fluctuation Zone of Heilongtan Reservoir in Meishan City,Sichuan Province
The water level fluctuation zone is a distinctive seasonal wetland ecosystem between terrestrial and aquatic ecosystems.It serves crucial functions such as sediment trapping and the absorption of non-point source pollutants.To reveal the current status of vegetation at the water level fluctuation zone of the Heilong-tan Reservoir,the plant communities'types and their distribution patterns were quantitatively evaluated using field belt surveys coupled with the Two-way indicator species analysis(TWINSPAN)classification method in June 2023.The results showed that the seed plants in the water level fluctuation zone of the Heilongtan Reser-voir were comprised of 32 species within 16 families and 29 genera,with a predominance of annual herba-ceous plants.The flora mainly consisted of tropical flora and northern temperate flora.As water levels ascend,there was a noted increase in the species importance value of the perennial herbaceous plants in the water lev-el fluctuation zone,in contrast to the annual herbaceous plants,which exhibit a decline in importance with ris-ing waters.The water level fluctuation zone of the Heilongtan Reservoir hosted a diversity of plant communi-ties,with 10 distinct types identified,among which the Cynodon dactylon,Abutilon theophrasti,Alternanthera philoxeroides,and the Juncus alatus-Echinochloa caudata communities were notably dominant.The plant community composition within the water level fluctuation zone was significantly influenced by the depth,du-ration,and frequency of water inundation,with pronounced variations observed across different water level el-evations.Dominant species and community structures within the water level fluctuation zone demonstrated perceptible shifts in response to the water level fluctuations,underscoring the intricate interplay between aquatic and terrestrial dynamics in this ecologically sensitive area.
water level fluctuation zoneplant community characteristicsTwo-way indicator species analysis classificationHeilongtan Reservoir
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