Cadmium (Cd) pollution in soil poses a grave threat to human health. Combining various approaches to reduce Cd accumulation in crops is an active area of research to remediate farmlands with medium-high levels of Cd contamination. The Mercapto-functionalized palygorskite (PGS-SH) and zinc (Zn) application alone or in combination were investigated to explore the reduction of Cd uptake by B. chinensis L and transformation of Cd in soil. The sole application of Zn or PGS-SH increased the biomass of B. chinensis L. and decreased the concentration of Cd in plants, but more improvements were observed from the combined application of Zn and PGS-SH. Low concentration of exogenous Zn (50 mg·kg^-1) significantly increased the soil respiration rate (SRR) and the soil dehydrogenase activity (sDHA), while promoted B. chinensis L. growth while inhibiting Cd uptake. However, excessive exogenous Zn (≥ 200 mg·kg^-1) significantly inhibited B. chinensis L. growth and soil microbial activity. The combined application of PGS-SH and Zn had the highest sDHA (145.59%) and lowest transport factor (TF) (27.59%) compared with the CK. The combination of PGS-SH and Zn fertilizer is a safe and effective means to reduce the accumulation of Cd in plants and restore microbial activity.

中文翻译：

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巯基功能化坡缕石与锌的结合影响根际土壤中镉的植物有效性和土壤微生物活性

土壤中的镉 (Cd) 污染对人类健康构成严重威胁。结合各种方法来减少作物中 Cd 的积累是修复中高水平 Cd 污染农田的一个活跃研究领域。研究了单独或组合使用巯基功能化坡缕石 (PGS-SH) 和锌 (Zn) 以探索减少B. chinensis L对 Cd 吸收和土壤中 Cd 的转化。单独施用Zn 或PGS-SH 增加了B. chinensis L.的生物量并降低了植物中Cd 的浓度，但Zn 和PGS-SH 的联合施用观察到了更多的改善。低浓度外源锌（50 mg·kg ^-1) 显着提高土壤呼吸率 (SRR) 和土壤脱氢酶活性 (sDHA)，同时促进B. chinensis L. 生长，同时抑制 Cd 吸收。然而，过量的外源Zn（≥ 200 mg·kg ^-1）显着抑制了B. chinensis L. 的生长和土壤微生物活性。与CK相比，PGS-SH和Zn的联合应用具有最高的sDHA（145.59%）和最低的转运因子（TF）（27.59%）。PGS-SH与锌肥配合使用，是减少植物体内镉积累、恢复微生物活性的安全有效手段。