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首页> 外文期刊>Environmental Science & Technology >Rice Rhizospheric Effects on the Bioavailability of Toxic Trace Elements during Land Application of Biochar
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Rice Rhizospheric Effects on the Bioavailability of Toxic Trace Elements during Land Application of Biochar

机译：生物炭土地应用中有毒微量元素生物利用度的水稻流散性

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摘要

Land application of biochar, the product of organic waste carbonization, can improve soil fertility as well as sequester carbon to mitigate climate change. In addition, biochar can greatly influence the bioavailability of toxic trace elements (TTEs) in soils resulting from its large internal surface areas, abundance in organic carbon, and ability to modify soil pH. Most research to date employs batch leaching tests to predict how biochar addition impacts TTE bioavailability, but these ex situ tests rarely considered the rhizospheric effect which might offset or intensify the changes induced by organic residue addition. This is especially so in rice rhizospheres because of strong clines in localized redox conditions. In this study, we adopted in situ high-resolution (HR) diffusive gradients in thin films (DGT) as well as rhizo-bag porewater sampling experiments to depict an overall picture of the difference in TTE (As, Cd, Cu, Ni, and Pb) bioavailability between the rice rhizosphere and bulk soils during land application of biochar. Porewater sampling experiments revealed that biochar additions stimulated TTE release due to the increase of dissolved organic carbon (DOC) and H~+ concentrations. In the rhizosphere, although biochar still promoted As, Cd, and Ni release into porewaters, the rhizospheric effect was one of dampening/reduction compared with the bulk soil. When we focused on the localized changes of TTE bioavailability in the rhizosphere using an in situ HR-DGT approach, on the contrary, flux maxima of Cd, Cu, and Ni occurred near/on the root surface, and hot spots of As can be observed at peripheries of the rooting zone, which
机译：生物炭土地应用，有机废物碳化的产物，可以改善土壤肥力以及孤载碳，缓解气候变化。此外，Biochar可以大大影响由其大型内表面区域，有机碳丰富的土壤中有毒微量元素（TTE）的生物利用度，以及改性土壤pH的能力。大多数研究迄今使用批次浸出测试以预测生物炭加入如何影响TTE生物利用度，但这些原地测试很少被认为是可能抵消或加剧通过有机残留物引起的变化的流散效果。由于局部氧化还原条件的强裂纹，这尤其如此。在这项研究中，我们采用了薄膜（DGT）的原位高分辨率（HR）扩散梯度以及Rhizo-Bak孔喷水采样实验，以描绘TTE的差异（如CD，Cu，Ni，生物炭土壤中水稻根际和散装土壤之间的生物利用度。沉积物采样实验显示，由于溶解的有机碳（DOC）和H〜+浓度的增加，Biochar添加刺激的TTE释放。在根际，虽然生物炭仍然被推广，CD和Ni释放到芯片中，但与散装土壤相比，流散效果是阻尼/缩减之一。当我们使用原位HR-DGT方法专注于根际的TTE生物利用度的本地化变化，相反，CD，Cu和Ni的助焊剂最大值近/在根表面附近发生，以及可以的热点在生根区的外周观察到哪个

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  • 来源
    《Environmental Science & Technology》 |2021年第11期|7344-7354|共11页
  • 作者

    Wen Fang; Yi Yang; Hailong Wang; Danxing Yang; Jun Luo; Paul N. Williams$;

  • 作者单位

    State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing Jiangsu 210023 China;

    State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing Jiangsu 210023 China;

    School of Environment and Chemical Engineering Foshan University Guangdong 528000 China;

    State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing jiangsu 210023 China;

    State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing Jiangsu 210023 China;

    Institute for Global Food Security School of Biological Sciences Queen's University Belfast Belfast BT9 5DL United Kingdom;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);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
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  • 关键词

    demonstrated the high heterogeneity and complexity of the rhizosphere's influence on TTE bioavailability.;

    机译：证明了根际对TTE生物利用度影响的高异质性和复杂性。;

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