DOM derivations determine the distribution and bioavailability of DOM-Se in selenate applied soil and mechanisms

文献类型： 外文期刊

第一作者： Wang, Dan

作者： Wang, Dan;Peng, Qin;Yang, Wen-Xiao;Quang Toan Dinh;Thi Anh Thu Tran;Zhao, Xing-Da;Wu, Jiang-Tong;Liang, Dong-Li;Wang, Dan;Peng, Qin;Liu, Yong-Xian;Liang, Dong-Li

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关键词： Selenium; Straw amendment; DOM; Bioavailability; Spectroscopy

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2020 年 259 卷

页码：

收录情况： SCI

摘要： Straw amendment and plant root exudates modify the quality and quantities of soil dissolved organic matter (DOM) and then manipulate the fractions of soil selenium (Se) and its bioavailability. Two typical soils with distinct pH were selected to investigate the effect of different contributors on DOM-Se in soil. The mechanisms relying on the variation in DOM characteristics (quality, quantity and composition) were explored by UV-Vis, ATR-FTIR and 3D-EEM. Straw amendment significantly (p < 0.05) suppressed the selenate bioavailability. The reduction in wheat Se content was greater in krasnozems than in Lou soil, as more HA fraction appeared in krasnozems. The root exudates of wheat mainly elevated the low molecular hydrophilic compounds (Hy) in soil, which contributed to the SOL-Hy-Se fractions and thus grain Se in soils (p < 0.01). However, straw amendment promoted DOM transforming from small molecules (Hy and FA) to aromatic large molecules (HA), when accompanied with the reduction and retention of Se associated with these molecules. As a result, selenium bioavailability and toxicity reduced with DOM amendment and DOM-Se transformation. (C) 2020 Elsevier Ltd. All rights reserved.

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