The soil cadmium (Cd) availability and uptake by Tagetes patula grown in two soil types contaminated with Cd and amended with N fertilizer and wheat straw were studied in a pot-culture experiment. The results indicated that N fertilizer treatment (N) and N fertilizer plus straw treatment (NS) promoted T. patula growth, while straw treatment (S) decreased T. patula biomass relative to the control. NS and S treatments increased Cd mobility in the soil and facilitated its uptake by T. patula in Acidic Ferralsols (AF) and Calcaric Cambisols (CC), but the promotion effect was much greater in CC than in AF. The Cd concentrations in the Tagetes shoots in the S and NS treatments were 40% and 27% greater, respectively, than those in the control treatment for AF, and 111% and 80% greater, respectively, for CC. Decreases in soil pH and increases in dissoluble organic carbon concentration after adding N fertilizer and straw were associated with an increase in soil Cd availability and in Cd uptake by T. patula. The results indicate that the NS treatment can alter the soil microenvironment, increasing Cd bioavailability and thus facilitating Cd uptake by T. patula. This work highlights that the combined application of N fertilizer with straw may be a useful way to increase the phytoextraction efficiency of Cd-contaminated soil by the Cd-hyperaccumulator T. patula.

在盆栽试验中研究了生长在两种被Cd污染并用N肥和麦秸改良的土壤类型中的Tagetes patula对土壤镉的吸收和吸收。结果表明，相对于对照，氮肥处理（N）和氮肥加秸秆处理（NS）促进了pat草的生长，而秸秆处理（S）减少了T草的生物量。NS和S处理增加了土壤中Cd的迁移率，并促进了其在酸性铁器肥（AF）和钙化坎比索尔（CC）中的被pat。T. patula吸收，但CC的促进作用远大于AF。万寿菊中的Cd浓度S和NS处理的嫩芽分别比对照处理的AF高40％和27％，而CC的分别高111％和80％。降低了土壤的pH值和增加可溶性有机碳浓度加入氮肥和稻草后用通过增加土壤镉可用性和镉摄取相关孔雀草。结果表明，NS处理可以改变土壤的微环境，增加Cd的生物利用度，从而促进pat。patula对Cd的吸收。这项工作亮点该氮肥与吸管的组合应用可以是由CD-超富集以增加Cd污染土壤的植物提取效率的有用方法孔雀草。