Eroded mine soils are a serious environmental problem in many parts of the world. Coal gasification slag, a byproduct of the coal gasification process, was modified with sludge-derived amino acids for the purpose of remediating eroded mine soils. Amino acid–modified magnetic coal gasification slag (AMS) was evaluated for its ability to decrease heavy metal erosion, improve soil aggregate structure and plant growth, and enhance microbial enzymatic activity. Alhagi sparsifolia (A. sparsifolia) was grown in greenhouse experiments under different AMS concentrations (0%, 1%, 5%, and 10%). The growth rate of A. sparsifolia increased with increasing AMS concentrations, and the optimal portion of AMS in soil was 7.5%. A. sparsifolia grown in mine soil amended with 7.5% AMS significantly (p < 0.05) decreased bioavailability of all heavy metals studied in this work (except for iron [Fe]) and increased (p < 0.05) activity of three soil enzymes: phosphatase (PA), urease (UA), and β-glucosidase (β-GA). In addition, the reusability of AMS was very good. AMS-amended mine soil may interact with growing plants to cycle needed nutrients while immobilizing toxic metals. AMS is thus a promising amendment for remediating eroded mine soils.

中文翻译：

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污泥氨基酸改性磁性煤气化渣对植物生长、金属有效性和土壤酶活性的影响

在世界许多地方，被侵蚀的矿山土壤是一个严重的环境问题。煤气化炉渣是煤气化过程的副产品，用污泥衍生的氨基酸改性，以修复被侵蚀的矿井土壤。评估了氨基酸改性磁性煤气化渣（AMS）减少重金属侵蚀、改善土壤团聚体结构和植物生长以及增强微生物酶活性的能力。Alhagi sparsifolia (A. sparsifolia) 在温室实验中在不同 AMS 浓度（0%、1%、5% 和 10%）下生长。A. sparsifolia 的生长速度随着 AMS 浓度的增加而增加，土壤中 AMS 的最佳比例为 7.5%。A. sparsifolia 在矿区土壤中生长的 7.5% AMS 显着改善（p < 0. 05) 降低了这项工作中研究的所有重金属的生物利用度（铁 [Fe] 除外），并增加了（p < 0.05）三种土壤酶的活性：磷酸酶 (PA)、脲酶 (UA) 和 β-葡萄糖苷酶 (β- GA）。另外，AMS的复用性非常好。AMS 修正的矿区土壤可能与生长中的植物相互作用以循环所需的养分，同时固定有毒金属。因此，AMS 是修复侵蚀矿井土壤的有希望的改良剂。