Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei, China.
Int J Phytoremediation. 2021;23(10):1052-1060. doi: 10.1080/15226514.2021.1874290. Epub 2021 Jan 25.
() is known as a sufficient plant for phytoremediation of cadmium (Cd) polluted soils. This study aimed to investigate the effects of ethylene diamine tetraacetic acid (EDTA), tea saponin (TS), and citric acid (CA) on Cd uptake and translocation by . To do so, using a pot experiment, we set four concentration levels of activators (1, 3, 5, and 10 mmol L) and a control (CK). Results showed that none of the applied activators had significant impact on soil pH. Except for CA-10, the concentration of available Cd in Cd polluted soils increased by 65.8-72.9% compared with CK. The EDTA-1, CA-1, and TS-5 treatments caused significant increases of 52.3, 67.2, and 38.4%, respectively, in the biomass of aerial parts of ( < 0.05) compared with CK. Except for CA-3, activators increased Cd accumulation in the aerial parts of plants by 47-124% compared with CK. Of all activators, EDTA-3 caused the highest Cd accumulation of 6.64 g pot in the aerial plant tissues followed by CA-10 (6.25 g pot) and TS-1 (5.48 g pot). Finally, our results suggested that the application of together with different activators sufficiently reduced soil total Cd by 4.64-48.4% compared with CK. These findings suggest that appropriate application of EDTA, TS, and CA can promote phytoremediation of Cd contaminated soils by hyper-accumulators. In particular, the combined use of EDTA and is an affordable and promising strategy for remediation of Cd contaminated soil. () is a well-known hyper-accumulator plant for remediation of cadmium (Cd) and zinc (Zn) contaminated soils. In addition, low molecular rganic acids and macromolecular chelating agents can improve the solubility and leaching of soil heavy metals. In the present work, we examined the combined effects of three activators (EDTA, tea saponin, and citric acid) with to remediate a Cd contaminated soil in Anhui Province, East China. Our results indicated the effectiveness of these activators to increase soil available Cd, as well as improving the biomass of and its Cd uptake. We believe that this study provides an efficient approach to increase the uptake of Cd by , restoring Cd contaminated soils. Nevertheless, excessive activators may have adverse effects on soil aggregates and soil microorganisms. Therefore, it is necessary to control the amount of chelating agents and subsequently the deterioration of soil quality.
（）是一种用于修复镉（Cd）污染土壤的有效植物。本研究旨在探讨乙二胺四乙酸（EDTA）、茶皂素（TS）和柠檬酸（CA）对（）吸收和转运 Cd 的影响。为此，我们采用盆栽试验，设置了 4 种浓度水平的活化剂（1、3、5 和 10mmol L）和对照（CK）。结果表明，所施加的活化剂均未对土壤 pH 值产生显著影响。除 CA-10 外，与 CK 相比，Cd 污染土壤中有效 Cd 的浓度增加了 65.8-72.9%。EDTA-1、CA-1 和 TS-5 处理分别显著增加了 52.3%、67.2%和 38.4%的（<0.05）地上部生物量。除 CA-3 外，与 CK 相比，活化剂使植物地上部 Cd 积累增加了 47-124%。在所有活化剂中，EDTA-3 使植物地上部组织中 Cd 的积累最高，为 6.64g 盆-1，其次是 CA-10（6.25g 盆-1）和 TS-1（5.48g 盆-1）。最后，我们的结果表明，与 CK 相比，与不同活化剂一起施加（）可使土壤总 Cd 减少 4.64-48.4%。这些发现表明，适当应用 EDTA、TS 和 CA 可以促进超富集植物对 Cd 污染土壤的修复。特别是 EDTA 和（）的联合使用是一种经济实惠且有前景的修复 Cd 污染土壤的策略。（）是一种修复 Cd 和 Zn 污染土壤的著名超富集植物。此外，低分子有机酸和高分子螯合剂可以提高土壤重金属的溶解度和淋出率。在本研究中，我们考察了三种活化剂（EDTA、茶皂素和柠檬酸）与（）联合修复中国东部安徽省 Cd 污染土壤的效果。结果表明，这些活化剂能有效增加土壤有效态 Cd，提高（）的生物量及其 Cd 吸收。我们认为，本研究为提高（）对 Cd 的吸收提供了一种有效的方法，从而修复 Cd 污染土壤。然而，过量的活化剂可能会对土壤团聚体和土壤微生物产生不利影响。因此，有必要控制螯合剂的用量，从而控制土壤质量的恶化。
