关键词: 辣椒, 土壤污染, 活化磷矿粉, 镉形态

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