Biology Department, College of Science, King Khalid University, Abha 61321, P.O. Box 9004, Saudi Arabia; Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama 338-8570, Japan; Botany Department, Faculty of Science, Kafr El-Sheikh University, Kafr El-Sheikh 33516, Egypt.
Biology Department, Faculty of Science, Taif University, Taif, Saudi Arabia; Botany and Microbiology Department, Faculty of Science, Helwan University, Cairo, Egypt.
Sci Total Environ. 2020 Apr 20;714:136603. doi: 10.1016/j.scitotenv.2020.136603. Epub 2020 Jan 11.
The ability of the native emergent macrophytes Typha domingensis for monitoring pollution with trace metals in Egyptian Lake Burullus was investigated through developing regression models for predicting their concentrations in the plant tissues. Plant samples (above-ground shoot and below-ground root and rhizome) as well as sediment samples were collected monthly during one growing season and analyzed. The association of trace metals concentration with several sediment characteristics (pH, organic matter, clay and silt) was also studied using the simple linear correlation coefficient (r). The concentration of some trace metals was significantly proportional to its values in the sediment such as Cd in the shoot, rhizome and root, Fe in the rhizome, and Ag in the root. There was positive relationship between the bioaccumulation factor (BAF) of Ag, Cd, Fe, Pb and Zn and sediment pH, organic matter and clay content. The developed regression models were significantly valid with high model efficiency and coefficient of determination, and low mean normalized average error. Trace metals were accumulated in the below-ground root and rhizome rather than in the shoot. Only Ag, Co and Ni provided bioaccumulation factor (BAF) < 1, while Ag was the only trace metal that could be transferred to some extend from the root to the rhizome and from there to the shoot [translocation factor (TF) 2.55 and 1.15, respectively]. Typha domingensis in Lake Burullus could be regarded as a bioindicator of trace metals pollution, and a good candidate as phytoremediator for Ag. The information on the phytoremediation capacity of T. domingensis certainly helps to solve contamination problems at Egyptian Lake Burullus region using this native plant.
本研究通过建立回归模型预测植物组织中痕量金属的浓度，探讨了本土挺水植物香蒲（Typha domingensis）对埃及布卢鲁斯湖污染的监测能力。在一个生长季节内，每月采集植物（地上部分的茎叶和地下部分的根和根茎）和沉积物样本，并进行分析。还使用简单线性相关系数（r）研究了痕量金属浓度与几种沉积物特征（pH 值、有机质、粘土和粉土）之间的关系。一些痕量金属的浓度与沉积物中的浓度呈显著比例关系，如茎叶中的 Cd、根茎和根中的 Fe 以及根中的 Ag。Ag、Cd、Fe、Pb 和 Zn 的生物积累因子（BAF）与沉积物 pH 值、有机质和粘土含量呈正相关。所建立的回归模型具有较高的模型效率和决定系数，以及较低的平均归一化平均误差，具有较高的有效性。痕量金属主要积累在地下部分的根和根茎中，而不是地上部分的茎叶中。只有 Ag、Co 和 Ni 的生物积累因子（BAF）<1，而 Ag 是唯一一种可以在一定程度上从根转移到根茎，然后从根茎转移到茎叶的痕量金属（迁移因子（TF）分别为 2.55 和 1.15）。布卢鲁斯湖的香蒲可以作为痕量金属污染的生物指示剂，也可以作为 Ag 的植物修复候选物。关于香蒲植物修复能力的信息肯定有助于利用这种本地植物解决埃及布卢鲁斯湖地区的污染问题。
