Abstract: In order to explore the effect of activated phosphate rock powder on the transformation of cadmium（Cd）fraction in Cd‐safely‐utilized lime soil and the absorption of Cd by pepper，and to provide scientific basis for the development and utilization of phosphate rock powder，the Cd‐safely‐utilized lime soil and pepper variety‘Qing Hong Yuan Shuai’were selected as test materials. The effects of no phosphate rock powder（CK），0.5% phosphate rock powder（PR‐0.5%），0.5% oxalic acid activated phosphate rock powder（CPR‐0.5%）and 0.5% citric acid activated phosphate rock powder（NPR‐0. 5%）on soil Cd fraction，pepper biomass and fruit Cd content were studied by indoor culture experiment and pot experiment.The results showed that compared with the control（CK），the dry weight of pepper fruits treated with unactivated and activated phosphate rock powder increased significantly by 13.99%—41.79%，and the dry weight of pepper fruits treated with NPR‐0.5% was the largest.With the prolongation of culture time，the content of available Cd in soil decreased. Compared with 0 d，after 90 d of soil culture，the decrease of available Cd in CK，PR‐0.5%，CPR‐0.5% and NPR‐0.5% was 26.67%，26.67%，31.11% and 35.56%，respectively.The application of unactivated and activated phosphate rock powder promoted the transformation of activated Cd fraction in soil to inert fraction，and the content of activated Cd fraction in NPR‐0.5% treatment was the lowest. Compared with CK，the proportion of activated Cd fraction in NPR‐0.5% treatment decreased by 16.45 percentage points.Compared with CK，the Cd content of pepper fruits treated with unactivated and activated phosphate rock powder decreased by 14.04%—31.58%，and the Cd content of pepper fruits treated with NPR‐0.5% decreased the most.In summary，NPR‐0.5% treatment promoted the transformation of activated Cd fraction in soil to inert fraction and inhibited the absorption of Cd by pepper.

Key words: Pepper, Soil pollution, Activated phosphate rock powder, Cadmium fraction

摘要： 探讨活化磷矿粉对镉（Cd）安全利用类石灰土Cd形态转化与辣椒吸收Cd的影响，为磷矿粉开发利用提供科学依据。以Cd安全利用类石灰土与青红元帅朝天椒为试材，采用室内培养试验和盆栽试验，研究不施磷矿粉（对照，CK）、0.5%磷矿粉（PR-0.5%）、0.5%草酸活化磷矿粉（CPR-0.5%）、0.5%柠檬酸活化磷矿粉（NPR-0.5%）对土壤Cd形态、辣椒生物量及果实Cd含量的影响。结果表明，与CK相比，施用磷矿粉、活化磷矿粉处理显著增加辣椒果实干质量，增幅为13.99%~41.79%，其中NPR-0.5%处理增幅最大。随培养时间的延长，土壤有效Cd含量显著降低，与培养0 d相比，培养90 d后，CK、PR-0.5%、CPR-0.5%、NPR-0.5%处理土壤有效Cd降幅分别为26.67%、26.67%、31.11%、35.56%。施用磷矿粉、活化磷矿粉处理可促进土壤活性态Cd向惰性态转化，其中NPR-0.5%处理土壤活性态Cd含量最低，与CK相比，其活性态Cd占比降低了16.45个百分点。与CK相比，施用磷矿粉、活化磷矿粉处理可降低辣椒果实Cd含量，降幅为14.04%~31.58%，其中NPR-0.5%处理降幅最大。综上，NPR-0.5%处理可促进土壤活性态Cd向惰性态转化，抑制辣椒Cd吸收效果最佳。

关键词: 辣椒, 土壤污染, 活化磷矿粉, 镉形态