Fe oxides simultaneously improve stability of Cd and carbon in paddy soil: The underlying influence at aggregate level

文献类型： 外文期刊

第一作者： Li, Shanshan

作者： Li, Shanshan;Fei, Yang;Wang, Chen;Sun, Jiajun;Liang, Jiahui;Feng, Yao;Yang, Bing;Shi, Huading;Wang, Meng;Chen, Shibao

作者机构：

关键词： Aggregate; Iron oxides; Cadmium; Soil organic carbon; Paddy soil

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：12.2； 五年影响因子：11.9 ）

ISSN： 0304-3894

年卷期： 2024 年 477 卷

页码：

收录情况： SCI

摘要： Iron (Fe) oxides have a strong adsorption affinity for Cd and organic carbon (SOC). However, under alternate wet-dry (IF) condition,the influences of Fe oxides on the speciation and disrtribution of Cd and SOC in soil aggregates are unkown. In the present study, soils untreated (S), removed (S-Fe) or added (S+Fe) Fe oxide soils were blended with cadmium chloride solution and cultivated for 56 days under different moisture management practices. Compared with the S-Fe soil, the IF treatment increased the contents of Fe oxide-bound SOC (Fe-OC) and Fe/Mn oxide-bound Cd (Fe/Mn-Cd) by 18.5-29.8-fold and 1.45-2.45-fold, repectively, in the S and S+Fe soils, corresponding to a 36 %-42 % increase in the recalcitrant C pool (RCP) and a 53 %-87 % decrease in the exchangeable Cd content. These results could be attributed to soil particle aggregation and Fe redistribution. Fe addition promoted the transfer of Cd/SOC accumulated in microaggregates to macroaggregates and increased the variable negative charge content in macroaggregates and the adsorption capacity of macroaggregates for Cd/ SOC. More Cd/SOC accumulated in macroaggregates in Fe oxide-bound form, which reduced the risk of Cd migration and Cd availability and increased the physical protection of SOC. Therefore, Fe oxide has great po- tential to simultaneously reduce carbon emissions and cadmium toxicity in paddy soil.

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