To explore the effects of herbaceous plants on mercury (Hg) behaviors after flooding in the water-level fluctuation zone (WLFZ) of Jialing River, three typical local plants (D. pyramidalis, A. philoxeroides and C. dactylon) and their in-situ sediments were collected for flooding experiments to study the Hg dynamics of water and sediment in different treatments. The results showed that flooding increased sediment MeHg concentrations and flooded plants (especially for the D. pyramidalis) promoted this process. Similarly, the highest dissolved MeHg level and proportion of MeHg to total Hg (%MeHg) were observed in plant-water treatments in the presence of D. pyramidalis, indicating the potential for the methylation of Hg in the water body influenced by the decay process of herbaceous plants. These results suggest that the herbaceous plant D. pyramidalis contributes more to Hg methylation and release in the WLFZ of the Jialing River than other plants studied.

为探讨草本植物对嘉陵江水位波动带（WLFZ）洪水后汞（Hg）行为的影响，三种典型的地方植物（D. pyramidalis、A. philoxeroides和C. dactylon）及其含量采集原位沉积物进行驱水实验，研究不同处理下水和沉积物中的汞动态。结果表明，洪水增加了沉积物中甲基汞的浓度，并且被淹的植物（特别是对锥体锥虫）促进了这一过程。同样，在存在锥体锥虫的植物水处理中观察到最高溶解的甲基汞水平和甲基汞占总汞的比例 (%MeHg)，表明受草本植物腐烂过程影响的水体中汞甲基化的潜力。这些结果表明，草本植物D. pyramidalis对嘉陵江 WLFZ 中 Hg 甲基化和释放的贡献比其他研究的植物更大。