We aimed to investigate how sulfur (S) application prior to oilseed rape cultivation influences the uptake of cadmium (Cd) by rice grown in low- and high-Cd soils. A pot experiment involving four S levels (0, 30, 60, 120 mg S kg⁻¹) combined with two Cd rates (low and high—0.35 and 10.35 mg Cd kg⁻¹, respectively) was conducted. Soil pore water during rice growth and plant tissues at maturity were analyzed. The soil pore water results indicated that S application decreased Cd solubility under submergence due to the S-induced increase of soil pH and the enhancement of sulfide formation in soil micropores. When S was applied at rates of 30, 60 and 120 mg S kg⁻¹, brown rice Cd concentrations decreased by 18%, 18%, and 55% (p < 0.05) in the low-Cd soil but increased by 20%, 40%, and 40% in the high-Cd soil compared with those in the non-S treatment. The different effects of S on Cd accumulation in brown rice were related to Cd-induced oxidative stress in the rice plants. In low-Cd soils, a S-induced increase in phytochelatins in rice roots restricted and inhibited Cd translocation in brown rice. In high-Cd soils, the Cd-induced oxidative stress in rice plants weakened the protective effects of S, while highlighted the promotion of Cd uptake by S. Overall, S fertilizer is recommended for oilseed rape–rice rotations in low-Cd paddy fields. In high Cd-contaminated fields, oilseed rape–rice rotations are suitable for the simultaneous remediation by oilseed rape and production of rice without S fertilization.

我们旨在研究在油菜种植前施用硫 (S) 如何影响在低和高 Cd 土壤中种植的水稻对镉 (Cd) 的吸收。进行了涉及四种 S 水平（0、30、60、120 mg S kg ^-1）结合两种 Cd 比率（低和高——分别为 0.35 和 10.35 mg Cd kg ^-1）的盆栽实验。分析了水稻生长过程中的土壤孔隙水和成熟时的植物组织。土壤孔隙水结果表明，由于 S 诱导土壤 pH 值升高和土壤微孔中硫化物形成的增强，施硫降低了淹没条件下 Cd 的溶解度。当 S 以 30、60 和 120 mg S kg ^{-1 的}比例施用时，糙米 Cd 浓度降低了 18%、18% 和 55%（p < 0.05)，而在高镉土壤中与非硫处理相比分别增加了 20%、40% 和 40%。S对糙米Cd积累的不同影响与Cd诱导的水稻植株氧化应激有关。在低镉土壤中，硫诱导的水稻根部植物螯合素的增加限制和抑制了糙米中的镉易位。在高镉土壤中，镉诱导的水稻氧化胁迫减弱了硫的保护作用，同时强调了硫对镉的吸收。总体而言，硫肥推荐用于低镉稻田的油菜-水稻轮作. 在高镉污染田，油菜-水稻轮作适用于油菜和水稻不施硫的同时进行修复。