Phosphorus fractions and iron oxides responsible for the variations in the Cd retention capacity in tropical soil aggregates under different cropping patterns

文献类型： 外文期刊

第一作者： Wei, Dengxiu

作者： Wei, Dengxiu;Wei, Chaoxian;Pan, Pan;Lin, Bigui;Wu, Lin;Liu, Beibei;Wei, Dengxiu;Wei, Chaoxian;Wu, Lin;Liu, Beibei;Pan, Pan;Liu, Beibei;Pan, Pan;Liu, Beibei;Lin, Bigui;He, Zhenli

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关键词： Cadmium; Tropical soil aggregates; Adsorption characteristics; P fractions; Fe oxides

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：14.224； 五年影响因子：12.984 ）

ISSN： 0304-3894

年卷期： 2023 年 442 卷

页码：

收录情况： SCI

摘要： The environmental behavior of Cd in soil has been widely studied because of its close relationship with food security and soil environmental pollution. In this study, the roles of P fractions and Fe oxides in the retention of Cd in typical tropical soil from five cropping patterns were investigated. Although there was no evident rela-tionship between the Cd adsorption capacity and soil aggregate particle sizes, strong spatial associations of P, Fe, and Cd at the soil aggregates were observed via energy dispersive spectroscopy analysis. Among five cropping patterns, citrus plantations exhibited highest ratios (calculated by pixel area) of P overlapped with Cd (8.61%) and Fe overlapped with Cd (9.53%) in the microaggregates. Furthermore, the random forest model revealed that humic P and labile organic P greatly contributed to the sorptivity of Cd2+ by < 0.053 mm (13.3%) and 0.25-0.053 mm (13.4%) soil aggregates, respectively. Compared with the P fractions in different-sized soil ag-gregates, the contribution of Fe oxides to the sorption of Cd2+ by soil aggregates was more significant. Amor-phous ferric oxide had the most significant contribution to the sorptivity of Cd2+ by < 0.053 mm (26.0%), 0.25-0.053 mm (23.0%), 2.0-0.25 mm (25.1%), and > 2.0 mm (33.9%) soil aggregates.

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