[關(guān)鍵詞]
[摘要]
目的 系統(tǒng)評(píng)估漢白玉(Ar)、秸稈生物炭(Br)、粉煤灰(Fh)及菌渣(Me)對(duì)鎘(Cd)污染土壤的鈍化效果及其對(duì)艾蒿Artemisia argyi Cd吸收的影響。方法 以湖南省花垣縣和岳陽市鉛礦區(qū)Cd污染土壤為對(duì)象,開展盆栽試驗(yàn),測定4種鈍化材料對(duì)土壤總Cd、有效態(tài)Cd含量及1年生艾蒿地上與地下部位Cd富集的影響,分析其與土壤pH值、陽離子交換量(cation exchange capacity,CEC)的關(guān)聯(lián)性。結(jié)果 艾蒿地上部分Cd富集量顯著高于地下部分(P<0.05)。鈍化材料施用顯著提升土壤pH和CEC,并降低土壤總Cd及有效態(tài)Cd含量。材料效果排序?yàn)锳r>Br>Fh>Me。結(jié)論 艾蒿對(duì)Cd的轉(zhuǎn)運(yùn)富集能力集中于地上部分,可作為植物修復(fù)的靶向部位。鈍化材料通過提升土壤pH和CEC顯著抑制Cd生物有效性,其中Ar對(duì)Cd的固定效果最優(yōu),推薦為湖南鉛礦區(qū)艾蒿種植土壤修復(fù)的首選材料。
[Key word]
[Abstract]
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.
[中圖分類號(hào)]
R286.2
[基金項(xiàng)目]