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首页> 外文期刊>Journal of soil & sediments >Biochar induced Pb and Cu immobilization, phytoavailability attenuation in Chinese cabbage, and improved biochemical properties in naturally co-contaminated soil
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Biochar induced Pb and Cu immobilization, phytoavailability attenuation in Chinese cabbage, and improved biochemical properties in naturally co-contaminated soil

机译：生物炭诱导的铅和铜固定化，降低大白菜的植物利用率，并改善天然共污染土壤中的生化特性

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摘要

Purpose Contamination of agricultural soils with potential toxic elements (PTEs) has caused serious health and environmental concern all over the world. Therefore, eco-friendly solutions for Pb and Cu immobilization were required to minimize their mobility through various types of biochar amendments in contaminated soil.Materials and methods A greenhouse pot study was conducted to evaluate the comparative effect of rapeseed residue (RP), and rice straw (RS)-derived biochars, produced at different temperatures on Pb and Cu mobility and their accumulation in a high metal accumulating crop such as Chinese cabbage (Brassica chinensis L.). Sequential extraction, leaching toxicity, and phytoavailability techniques were used to assess Pb and Cu mobility. The impacts of various types of biochars on soil surface electronegative charge and soil enzymatic activity were also investigated in contaminated soil.Results and discussion The sequential extraction results revealed that the application of 5% of high-temperature rice straw biochar (RS550) and rapeseed residue biochar (RP550) significantly reduced the acid-soluble fractions (active fractions) of Pb and Cu by 53.50 and 50.35% respectively. Following the addition of 5% RS550, the residual fraction (stable fractions) of Pb and Cu were increased by 36.14 and 50.94% respectively. A remarkable decrease in Pb and Cu phytoavailability and solubility was observed after the soil was treated with 5% of both RS550 and RP550 biochars. In all biochar treatments, the maximum reduction of Pb concentration in roots and shoots of the cabbage was 37.81 and 26.54%, respectively, while the concentration of Cu decreased by 50.41 and 46.25%, respectively. Incorporation of biochar into contaminated soils also improved soil urease, catalase, and acid phosphatase activities as compared to the control soil.Conclusions Biochar application greatly enhanced the Pb and Cu immobilization, reduced phytoavailability to Chinese cabbage, and improved soil enzymes activity. The significant increment in soil surface electronegative charges and soil pH after biochar incorporation was considered one of the Pb and Cu immobilization mechanisms. Overall, application of rice straw biochar produced at 550 degrees C could potentially be a safe, efficient, and sustainable approach to stabilize Pb and Cu and restore soil functions in contaminated soil.
机译：目的农业土壤被潜在的有毒元素（PTE）污染已经引起全世界对健康和环境的严重关注。因此，需要一种环保的固定铅和铜的解决方案，以通过在污染土壤中通过各种生物炭改良剂来减少其迁移性。材料和方法进行了温室盆栽研究，以评估菜籽残渣（RP）和大米的比较效果。秸秆（RS）衍生的生物炭，在不同温度下产生的铅和铜迁移率及其在高金属积累作物如大白菜（Brassica chinensis L.）中的积累。连续提取，浸出毒性和植物利用率技术用于评估铅和铜的迁移率。在污染土壤中还研究了各种生物炭对土壤表面负电和酶活性的影响。结果与讨论连续提取结果表明，5％稻草生物炭（RS550）和菜籽渣的应用生物炭（RP550）分别将Pb和Cu的酸溶级分（活性级分）分别降低了53.50和50.35％。加入5％的RS550后，Pb和Cu的残留分数（稳定分数）分别增加了36.14％和50.94％。用5％的RS550和RP550生物炭处理土壤后，Pb和Cu的植物利用率和溶解度均显着下降。在所有生物炭处理中，白菜根和茎中铅的最大减少量分别为37.81和26.54％，而铜的浓度分别减少了50.41和46.25％。与对照土壤相比，将生物炭掺入到污染的土壤中还改善了土壤脲酶，过氧化氢酶和酸性磷酸酶的活性。结论生物炭的施用大大增强了铅和铜的固定化，降低了大白菜的植物利用率，并提高了土壤酶的活性。生物炭掺入后土壤表面带负电和pH值的显着增加被认为是铅和铜固定化机制之一。总体而言，使用在550摄氏度下生产的稻草生物炭可以潜在地成为一种安全，有效和可持续的方法，以稳定受污染的土壤中的Pb和Cu并恢复土壤功能。

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  • 来源
    《Journal of soil & sediments》 |2019年第5期|2381-2392|共12页
  • 作者

    Salam Abdus; Bashir Saqib; Khan Imran; Hussain Qaiser; Gao Ruili; Hu Hongqing;

  • 作者单位

    Huazhong Agr Univ, Coll Resources & Environm, Minist Agr, Key Lab Arable Land Conservat Middle & Lower Reac, 1 Shizishan St, Wuhan 430070, Hubei, Peoples R China;

    Huazhong Agr Univ, Coll Resources & Environm, Minist Agr, Key Lab Arable Land Conservat Middle & Lower Reac, 1 Shizishan St, Wuhan 430070, Hubei, Peoples R China|Ghazi Univ, Dept Soil & Environm Sci, Dg Khan, Pakistan;

    Huazhong Agr Univ, Coll Resources & Environm, Minist Agr, Key Lab Arable Land Conservat Middle & Lower Reac, 1 Shizishan St, Wuhan 430070, Hubei, Peoples R China;

    PMAS Arid Agr Univ, Dept Soil Sci & SWC, Rawalpindi 46000, Pakistan;

    Huazhong Agr Univ, Coll Resources & Environm, Minist Agr, Key Lab Arable Land Conservat Middle & Lower Reac, 1 Shizishan St, Wuhan 430070, Hubei, Peoples R China;

    Huazhong Agr Univ, Coll Resources & Environm, Minist Agr, Key Lab Arable Land Conservat Middle & Lower Reac, 1 Shizishan St, Wuhan 430070, Hubei, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Biochar; Chinese cabbage; Cu; Immobilization; Pb; Soil enzymes;

    机译：生物炭大白菜铜固定化铅土壤酶;

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