Lin Qingwei, Fan Mingjun, Peng Xue, Ma Jianmin, Zhang Yi, Yu Fei, Wu Zhenbin, Liu Biyun
College of Life Sciences, Henan Normal University, Xinxiang, 453007, China; State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China.
College of Life Sciences, Henan Normal University, Xinxiang, 453007, China.
J Hazard Mater. 2020 Dec 5;400:123167. doi: 10.1016/j.jhazmat.2020.123167. Epub 2020 Jun 12.
Increasing aluminum (Al) use and its effects on aquatic systems have been a global issue, however the Al impacts on submerged plants and their ecological functions were poorly understood. Aquatic simulation experiments were performed to study Al-toxicity on the germination and seedling morphological and physiological characteristics of Vallisneria natans, and investigate their synergistic effect on nitrogen (N), phosphorus (P) change and microbial community in sediment. The seeds germination characteristics, growth and physiological parameters of seedlings, including root activity, were significantly affected by alum treatments and the inhibition levels increased with Al concentration. The Al accumulation in roots and leaves were significantly different. Al concentration above 0.3 mg/L showed toxic to V. natans. TN, TP, IP, Fe/Al-P contents in sediments varied markedly under co-existence of Al and V. natans. Additionally, the relative abundance of sediment microbial community related to N, P cycle was effected. Results concluded that the increasing aquatic Al-concentration inhibits growth and propagation of submerged plants and the ecological restoration effect, and exerts synergistic effect with submerged plants on N, P components in sediments. Such findings were helpful for Al ecological evaluation, and were instructive for the submerged plants restoration in shallow eutrophic lakes with Al input.
铝（Al）使用量的增加及其对水生系统的影响已成为一个全球性问题，然而，铝对沉水植物及其生态功能的影响却鲜为人知。进行了水生模拟实验，以研究铝对苦草发芽、幼苗形态和生理特征的毒性，并探讨其对沉积物中氮（N）、磷（P）变化和微生物群落的协同作用。铝处理显著影响了种子发芽特性、幼苗生长和生理参数，包括根系活力，且抑制水平随铝浓度增加而升高。根和叶中的铝积累量存在显著差异。铝浓度高于0.3mg/L对苦草具有毒性。在铝和苦草共存的情况下，沉积物中的总氮（TN）、总磷（TP）、无机磷（IP）、铁/铝磷含量显著变化。此外，与氮、磷循环相关的沉积物微生物群落相对丰度也受到影响。结果表明，水体中铝浓度的增加会抑制沉水植物的生长和繁殖以及生态恢复效果，并与沉水植物对沉积物中的氮、磷成分产生协同作用。这些发现有助于铝的生态评价，并对有铝输入的浅水富营养化湖泊中沉水植物的恢复具有指导意义。
