Mechanism of Al toxicity alleviation in acidic red soil by rice-straw hydrochar application and comparison with pyrochar

文献类型： 外文期刊

第一作者： Yu, Weijia

作者： Yu, Weijia;Duan, Yinghua;Huai, Shengchang;Zhang, Qingyue;Cai, Zejiang;Lu, Changai;Yu, Weijia;Ren, Tusheng

作者机构：

关键词： Hydrochar; Root growth; Soil aluminum activity; Soil acid-buffering; Dissolved organic carbon

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2023 年 877 卷

页码：

收录情况： SCI

摘要： In the past decade, biochar has been widely regarded as a new type of soil conditioner that can effectively control soil acidification and alleviate Al toxicity. Hydrochar is identified as a more economical carbon material than pyrochar, but its effect on Al toxicity and the associated mechanism have not been studied. Thus, a two-stage indoor incubation exper-iment was conducted to investigate the effect of rice-straw hydrochar (HC, application rate: 1/2/3 %) on maize seedling root growth, soil solution Al activity, soil exchangeable Al and pH buffering ability in acidic red soils from two sites. We also used pyrochar (PC, application rate: 3 %) produced from the same rice straw for comparison. Except for HC-1 %, both hydrochar and pyrochar addition significantly stimulated relative root elongation (136.36 % -284.09 %), dimin-ished the cell death ratio (27.96 % -85.56 %) and Al content in root tips (18.80 % -80.11 %) by decreasing the total Al content (44.78 % -76.10 %) and the proportion of Al3+ species (27 % -32 %) in soil solution. Hydrochar did not significantly promote the soil pH buffer capacity (pH-BC) or effective cation exchange capacity (ECEC), while PC-3 % did. The DOC (dissolved organic carbon) content of soil solution was dramatically elevated by 203.9 % -783.2 % after hydrochar addition. Hydrochar mitigates Al activity in soil solution mainly through Al-DOC complexation and ad-sorption, thus suppressing the Al toxicity of maize roots. Hydrochar may be an economical soil amendment for amelio-rating Al toxicity despite its overall alleviation effect on Al toxicity being lower than pyrochar.

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