School of Resources and Environment, Anhui Agricultural University, Hefei, China.
College of Environmental Sciences and Engineering, Peking University, Beijing, China.
Int J Phytoremediation. 2023;25(13):1810-1818. doi: 10.1080/15226514.2023.2199876. Epub 2023 Apr 17.
Phytoremediation of arsenic (As) by ( is a cost-effective and environmentally friendly method for restoring As-contaminated sites. However, the phytoextraction efficiency is low in some cases, such as clay soil, thus biochar was applied to enhance the efficiency of As extraction. The paper investigated the effect of biochar on soil characteristic, As mobility, and As uptake in with a 90-day greenhouse experiment. Biochar derived from rice straw was added at rates of 0.5, 1.5, and 4% (w/w). The results showed that, under biochar amendment, soil pH raised from 5.24 to 6.03 and 4.91 to 5.85, soil dissolved organic carbon (DOC) increased 11.1-46.1% and 2.8-11.2%, respectively, in rhizosphere and bulk soils. Biochar also increased soil catalase (CAT) activity significantly, especially for the rhizosphere soil. Besides, biochar increased the labile As in the soils and transfer coefficient from roots to aboveground, thereby enhancing As accumulation by tissues. The accumulation of As in fronds of was up to 350 mg kg in 1.5% biochar, which was more than twice the control and far beyond other biochar treatments. The results indicate that biochar addition is favorable to improve phytoremediation of in As-contaminated soil and 1.5% (w/w) biochar may be a reasonable application ratio, thus providing an effective solution to enhance the efficiency of As phytoextraction.
（利用 进行砷（As）的植物修复是一种恢复受 As 污染场地的具有成本效益和环保的方法。然而，在某些情况下，如粘土土壤，植物提取效率较低，因此生物炭被应用于提高 As 提取效率。本研究通过 90 天的温室试验，调查了生物炭对土壤特性、As 迁移性和 对 As 的吸收的影响。生物炭由稻草制成，添加量分别为 0.5%、1.5%和 4%（w/w）。结果表明，在生物炭添加下，土壤 pH 值从 5.24 升高到 6.03 和 4.91 升高到 5.85，根际和非根际土壤中土壤溶解有机碳（DOC）分别增加了 11.1-46.1%和 2.8-11.2%。生物炭还显著增加了土壤过氧化氢酶（CAT）活性，尤其是根际土壤。此外，生物炭增加了土壤中不稳定的 As 含量和从根部到地上部分的转移系数，从而增加了 组织对 As 的积累。添加 1.5%生物炭时， 的叶中 As 积累量高达 350mgkg，是对照的两倍多，远高于其他生物炭处理。结果表明，添加生物炭有利于改善受 As 污染土壤中 对 As 的植物修复，1.5%（w/w）的生物炭可能是一个合理的应用比例，从而为提高 As 植物提取效率提供了有效解决方案。
