目的 系统评估汉白玉（Ar）、秸秆生物炭（Br）、粉煤灰（Fh）及菌渣（Me）对镉（Cd）污染土壤的钝化效果及其对艾蒿Artemisia argyi Cd吸收的影响。方法 以湖南省花垣县和岳阳市铅矿区Cd污染土壤为对象，开展盆栽试验，测定4种钝化材料对土壤总Cd、有效态Cd含量及1年生艾蒿地上与地下部位Cd富集的影响，分析其与土壤pH值、阳离子交换量（cation exchange capacity，CEC）的关联性。结果 艾蒿地上部分Cd富集量显著高于地下部分（P＜0.05）。钝化材料施用显著提升土壤pH和CEC，并降低土壤总Cd及有效态Cd含量。材料效果排序为Ar＞Br＞Fh＞Me。结论 艾蒿对Cd的转运富集能力集中于地上部分，可作为植物修复的靶向部位。钝化材料通过提升土壤pH和CEC显著抑制Cd生物有效性，其中Ar对Cd的固定效果最优，推荐为湖南铅矿区艾蒿种植土壤修复的首选材料。

Objective To systematically evaluate the passivation effects of white marble (Ar), straw biochar (Br), fly ash (Fh), and mushroom residue (Me) on cadmium (Cd)-contaminated soil and their impacts on Cd uptake in Artemisia argyi. Methods A pot experiment was conducted using Cd-contaminated soils from lead-mining areas in Huayuan County and Yueyang City, Hunan Province. The effects of the four passivators on total Cd content, available Cd content in soil, and Cd enrichment in aboveground and underground parts of one-year-old A. argyi were measured. The correlations with soil pH and cation exchange capacity (CEC) were analyzed. Results The Cd enrichment in the aboveground parts of A. argyi was significantly higher than that in the underground parts (P < 0.05). Application of passivators significantly increased soil pH and CEC while reducing total and available Cd content. The efficacy order of materials was Ar > Br > Fh > Me.Conclusion A. argyi exhibits stronger Cd translocation and enrichment capacity in aboveground tissues, making it a target site for phytoremediation. Passivators effectively inhibit Cd bioavailability by enhancing soil pH and CEC, with Ar demonstrating optimal Cd immobilization performance. Ar is recommended as the preferred material for soil remediation in A. argyi cultivation areas within lead-mining regions of Hunan Province.

R286.2