Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, People's Republic of China.
Environ Sci Pollut Res Int. 2013 Mar;20(3):1794-802. doi: 10.1007/s11356-012-1148-x. Epub 2012 Sep 12.
With the filling of the Three Gorges Reservoir, original vegetation in the water level fluctuation zone (WLFZ) between the elevations of 145 and 175 m disappeared due to the reversal of submergence time (winter flooding) and prolonged inundation duration (nearly half a year). To better understand the relationships between the environmental factors and recovered plant communities for reconstructing floristically diverse riparian zone, we conducted a field survey in 11 sites in the WLFZ in June 2010, and vegetation composition, flooding characteristics, heavy metals, and soil major nutrients were determined. Consequently, the canonical correspondence analysis was used to investigate the relationships between plant species composition and flooding characteristics, heavy metal contamination, and soil nutrients. Results demonstrated that vegetation in the WLFZ was dominated by annuals, i.e., Echinochloa crusgalli and Bidens tripartita, and perennials including Cynodon dactylon, and plant species richness and diversity were negatively associated with flooding duration, heavy metal contamination, and nutrients including total phosphorus, available phosphorus, available potassium, and nitrate. Our results suggest that plant species, recovering mainly through soil seed bank and regeneration of remnant individuals, have been influenced by the combined effects of environmental factors.
随着三峡水库的蓄水，海拔 145 至 175 米之间的水位变动带（WLFZ）中的原始植被由于淹没时间（冬季洪水）的逆转和长时间淹没（近半年）而消失。为了更好地了解环境因素与恢复植物群落之间的关系，以便重建植物种类多样的河岸带，我们于 2010 年 6 月在 WLFZ 的 11 个地点进行了实地调查，测定了植被组成、洪水特征、重金属和土壤主要养分。随后，采用典范对应分析方法研究了植物物种组成与洪水特征、重金属污染和土壤养分之间的关系。结果表明，WLFZ 的植被以一年生植物为主，如稗草和三叶鬼针草，多年生植物包括狗牙根，植物物种丰富度和多样性与洪水持续时间、重金属污染以及包括总磷、有效磷、有效钾和硝酸盐在内的养分呈负相关。我们的研究结果表明，主要通过土壤种子库和残留个体再生恢复的植物物种受到环境因素综合作用的影响。
