Sulfhydryl Grafted Palygorskite can Efficiently and Stably Immobilize Cd in Calcareous Soil and Inhibit Cd Accumulation in Wheat in the Second Year

文献类型： 外文期刊

第一作者： Wang, Yale

作者： Wang, Yale;Hou, Kaihui;Jiang, Junxiao;Wang, Yali;Xu, Chunhong;Zhao, Qing;Yang, Yongqiang;Li, Liping;Shi, Gaoling;Xu, Yingming

作者机构：

关键词： Wheat; Sulfhydryl grafted palygorskite; Cd-contaminated calcareous soils; Freeze-thaw cycles; Immobilization stability

期刊名称：WATER AIR AND SOIL POLLUTION （ 影响因子：3.0； 五年影响因子：3.0 ）

ISSN： 0049-6979

年卷期： 2025 年 236 卷 5 期

页码：

收录情况： SCI

摘要： Cadmium (Cd) contamination of wheat fields is a major environmental problem. Sulfhydryl-grafted palygorskite (SGP) has been used as an efficient amendment to immobilize Cd in calcareous wheat fields. However, information on the long-term effects of SGP on soil Cd immobilization and accumulation in wheat remains limited. In this study, wheat pot and freeze-thaw (F/T) cycle experiments were conducted to explore the remediation stability of SGP during winter wheat growing. The wheat pot experiments showed that applying 0.1-0.2%SGP significantly decreased Cd in wheat grains by 21.57-57.85% in the second year. The application of 0.2%SGP decreased diethylenetriaminepentaacetic acid (DTPA) extractable Cd by 33.84-39.70%, increased DTPA extractable Mn by 11.22-15.86%, and promoted the conversion of exchangeable Cd into carbonate-bound and Fe/Mn oxide-bound Cd fractions in the soil in the second year. The composition and function of soil bacteria differed under the SGP treatment for two consecutive years. F/T cycle experiments showed that F/T cycles did not affect soil pH but converted exchangeable Cd and carbonate-bound Cd to the residual Cd fraction (6%) and increased the mass fraction of > 2 mm soil aggregates. Under 0.2%SGP application, F/T cycles further decreased the available soil Cd concentration and increased the immobilization efficiency of SGP on Cd by 9.37-11.82% in various aggregates. Although SGP can reduce Cd accumulation in wheat for two consecutive years, the remediation efficiency decreased compared to that in the first year, which is unrelated to seasonal F/T cycles; the specific reasons for this reduction must be further explored. Overall, SGP displayed long-term immobilization effects on Cd in wheat fields and showed higher efficiency under F/T cycle conditions, with the potential for long-term remediation of Cd-contaminated calcareous soils in cold regions.

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