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首页> 外文期刊>Ecotoxicology and Environmental Safety >The effect of biochar and crop straws on heavy metal bioavailability and plant accumulation in a Cd and Pb polluted soil
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The effect of biochar and crop straws on heavy metal bioavailability and plant accumulation in a Cd and Pb polluted soil

机译：生物炭和农作物秸秆对Cd和Pb污染土壤中重金属生物利用度和植物累积的影响

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摘要

Biochar derived from various materials has been investigated with regard to its ability to decrease the bioavailability of heavy metals in contaminated soils, and thus reduce their potential to enter the food chain. However, little attention has been given to the adsorption capacity of untreated crop straws, which are commonly used as a biochar feedstock, especially in soils. Hence, this study was conducted to investigate the effect of crop straws on heavy metal immobilization and subsequent heavy metal uptake by maize and ryegrass in a soil artificially polluted by Cd and Pb. Bamboo biochar, rice straw, and wheat straw were mixed into soil four weeks before the experiment, enabling them to reach equilibrium at 2% (w/w), 1% (w/w), and 1% (w/w), respectively. The results showed that soil pH for both species was significantly increased by all treatments, except when wheat straw was used for ryegrass cultivation. Soil organic carbon was only improved in the rice straw treatment and the soil alkali-hydrolyzable N content was significantly decreased with all of the amendments, which may have contributed to the lack of an effect on plant biomass. Soil available Cd was significantly lower in the rice straw treatment than in the control soil, while Pb levels dearly decreased in wheat straw treatment. Me Cd concentration in shoots of maize was reduced by 50.9%, 69.5%, and 66.9% with biochar, rice straw, and wheat straw, respectively. In addition, shoot Cd accumulation was decreased by 473%, 673%, and 66.4%, respectively. Shoot Pb concentration and accumulation were only reduced with the rice straw treatment for both species. However, metal uptake in plant roots was more complex, with increased metal concentrations also detected. Overall, the direct application of crop straw could be considered a feasible way to immobilize selected metals in soil, once the long-term effects are confirmed. (C) 2016 Elsevier Inc. All rights reserved.
机译：已经对源自各种材料的生物炭降低了重金属在污染土壤中的生物利用度的能力进行了研究，从而降低了其进入食物链的潜力。但是，对于未经处理的农作物秸秆的吸附能力几乎没有引起关注，农作物秸秆通常用作生物炭原料，尤其是在土壤中。因此，本研究旨在研究秸秆对镉和铅人工污染的土壤中重金属固定化以及玉米和黑麦草随后吸收重金属的影响。实验前四周将竹生物炭，稻草和小麦秸秆混合到土壤中，使它们达到2％（w / w），1％（w / w）和1％（w / w）的平衡，分别。结果表明，除小麦秸秆用于黑麦草栽培外，所有处理均显着提高了两种土壤的pH值。仅通过稻草处理，土壤有机碳得到改善，而所有这些改良剂均显着降低了土壤碱解性氮含量，这可能导致对植物生物量缺乏影响。稻草处理的土壤有效镉含量显着低于对照土壤，而铅的含量在小麦秸秆处理中明显降低。生物炭，稻草和麦秸分别使玉米芽中的Me Cd浓度降低了50.9％，69.5％和66.9％。此外，芽镉的积累分别减少了473％，6​​73％和66.4％。仅稻草处理对这两种物种而言，芽中铅的浓度和累积都降低了。但是，植物根部的金属吸收更为复杂，还检测到金属浓度增加。总体而言，一旦确定了长期效果，直接使用农作物秸秆被认为是将选定金属固定在土壤中的可行方法。 （C）2016 Elsevier Inc.保留所有权利。

著录项

  • 来源
    《Ecotoxicology and Environmental Safety》 |2016年第10期|94-100|共7页
  • 作者

    Xu Ping; Sun Cai-Xia; Ye Xue-Zhu; Xiao Wen-Dan; Zhang Qi; Wang Qiang;

  • 作者单位

    Zhejiang Acad Agr Sci, Inst Qual & Stand Agr Prod, Hangzhou 310021, Zhejiang, Peoples R China;

    Zhejiang Acad Agr Sci, Inst Qual & Stand Agr Prod, Hangzhou 310021, Zhejiang, Peoples R China;

    Zhejiang Acad Agr Sci, Inst Qual & Stand Agr Prod, Hangzhou 310021, Zhejiang, Peoples R China;

    Zhejiang Acad Agr Sci, Inst Qual & Stand Agr Prod, Hangzhou 310021, Zhejiang, Peoples R China;

    Zhejiang Acad Agr Sci, Inst Qual & Stand Agr Prod, Hangzhou 310021, Zhejiang, Peoples R China;

    Zhejiang Acad Agr Sci, Inst Qual & Stand Agr Prod, Hangzhou 310021, Zhejiang, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Heavy metal; Biochar; Crop straw; Bioavailability; Maize; Ryegrass;

    机译：重金属;生物炭;作物秸秆;生物利用度;玉米;黑麦草;

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