KMS Chongqing Institute of Green and Intelligent Technology, CAS
| Preliminary study on floristic composition and plant community diversity around shore zones of newly formed urban lakes in the three gorges reservoir area in the early winter-A case study of Hanfeng Lake in Kai County | |
Chen, Chun-Di1 ; Wu, Sheng-Jun1; Meurk, Colin Douglas2; Liu, Feng1,3; Huang, Ping1
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| 2014 | |
| 摘要 | In order to provide evidence-based advices on the future restoration of lake shore zone and environment within and around the water fluctuation zone of the Three Gorges Reservoir, this preliminary research investigated floristic composition and plant community diversity along a shoreline elevation gradient in Hanfeng Lake Wetland Park, Kai County, Chongqing Municipality. This study was carried out during the early winter in 2012 (high water condition) after a full cycle of water level fluctuation. Simplified importance value (SIV) was used to describe the characteristics of plant communities by recording plant coverage and height and calculating the volume they occupied in 1 m × 1 m sample quadrats laid out contiguously on transects from 173-180 m above sea level. The results showed that a total of 41 vascular plant species belonging to 39 genera and 22 families were identified. The dominant families were Asteraceae and Poaceae and almost all the genera were represented by only one species. A diverse range of plant life forms included annual herbs dominating below the water level of 175 m, while above this were more perennial herbs. Some economic and amenity woody plants, such as Eriobotrya japonica, Prunus persica, and Ligustrum lueidum, were also found above the water level of 175 m. There were 12 bioclimatic types of plant genera presented. Tropical types predominate and account for 47.5% of the genera, followed by temperate types with 32.5%. It revealed that the plant communities of the study area were distinctively transitional between tropical and temperate floras. With increasing distance (elevation) from the lake shore line, the dominant species transition from wetland plants to mesophytes. The results of one-way ANOVA analysis demonstrated that variation in species richness, community diversity, and dominance along the distance gradient was significant (p<0.05). Species richness, community diversity and evenness represented the pattern of gradually increasing and then declining, and reached the peak after the 175 m water level. The habitats at different elevations within the Three Gorges Reservoir experienced anti-natural and varying inundation periods and depths. These hydrological conditions appeared to be the main driver of plant composition and community structure. Choosing suitable plant species for vegetation restoration of the water fluctuation zone and lake shore environment must take account of the regional bioclimatic conditions, and plants' life history strategies in response to the specific hydrological conditions at different elevations. |
| 发表期刊 | Wetland Science
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| ISSN | 16725948 |
| 卷号 | 12期号:2页码:197-203 |
| 语种 | 中文 |
