Impact of leaching process for ion-adsorption rare earth ore on the characteristics of topsoil and the absorption of rare earth by Dicranopteris pedata

IF 3.9 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Biogeochemistry Pub Date : 2024-12-19 DOI:10.1007/s10533-024-01191-7

Haiyan Wang, Shujie Meng, Wenzhi Zhou, Guofu Wang, Zhibiao Chen, Zuliang Chen

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Abstract

Rare earth elements (REE) are important resources, but REE in the environment are also deemed to be a new class of pollutant. Phytoremediation, using the hyperaccumulator Dicranopteris pedata, offers a promising approach for reclaiming and recycling REE from mining tailings. However, how in situ leaching affects the topsoil characteristics of mining areas and the absorption of REE by D. pedata remains elusive. To address these issues, an in situ leached hill and an un-leached hill were selected for comparison. This study revealed the following: (1) a significant increase in total REE, heavy REE (HREE), and available REE at the leached hill by 47.28%, 100.74%, and 108%, respectively; (2) a marked elevation in the contents of REE in D. pedata of the leached hill, especially HREE in rhizomes, stems, and foliage by 634.45%, 232.63%, and 156.8%, respectively; and (3) a Pearson correlation analysis indicating that the enhanced uptake of REE by D. pedata at the leached hill is related to available REE in the topsoil. This study illuminates the mining-induced dynamics of soil REE migration and plant uptake, reinforcing the feasibility of phytoremediation for REE tailings.

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离子吸附型稀土矿浸出过程对表土特性及凤尾蜈蚣吸附稀土的影响

稀土元素是重要的资源，但环境中的稀土元素也被认为是一类新的污染物。利用超富集植物双翅蕨（Dicranopteris pedata）进行植物修复是回收和再利用尾矿中稀土元素的有效途径。然而，原地浸出如何影响矿区表土特征以及D. pedata对稀土元素的吸收仍然是一个未知的问题。为了解决这些问题，我们选择了一个原地浸出山和一个未浸出山进行比较。研究结果表明：(1)淋滤后坡面总REE、重REE （HREE）和有效REE分别显著增加47.28%、100.74%和108%；(2)土壤中稀土元素含量显著提高，其中根状茎、茎和叶的稀土元素含量分别提高634.45%、232.63%和156.8%；(3) Pearson相关分析表明，坡面土壤对稀土元素吸收的增强与表层土壤有效稀土元素有关。该研究阐明了采矿诱发的土壤稀土元素迁移和植物吸收动态，加强了稀土尾矿植物修复的可行性。

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来源期刊

Biogeochemistry 环境科学-地球科学综合

CiteScore

7.10

自引率

5.00%

发文量

112

审稿时长

3.2 months

期刊介绍： Biogeochemistry publishes original and synthetic papers dealing with biotic controls on the chemistry of the environment, or with the geochemical control of the structure and function of ecosystems. Cycles are considered, either of individual elements or of specific classes of natural or anthropogenic compounds in ecosystems. Particular emphasis is given to coupled interactions of element cycles. The journal spans from the molecular to global scales to elucidate the mechanisms driving patterns in biogeochemical cycles through space and time. Studies on both natural and artificial ecosystems are published when they contribute to a general understanding of biogeochemistry.