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通过盆栽试验,研究了小白菜在不同水平镉(Cd)污染土壤中的耐受性以及富集指标,并施加不同水平螯合剂对修复效果进行强化。结果表明:低水平Cd处理对小白菜的株高、干重有促进作用,而高水平Cd处理则表现出抑制作用,在土壤Cd添加量为200mg/kg时小白菜的株高、干重分别比土壤未添加Cd的小白菜降低了26.6%和42.6%;植株体内Cd积累规律为根部大于地上部,各部位含Cd量及Cd吸收总量均随着土壤Cd添加量的增加而递增,在土壤Cd添加量为150mg/kg时达到最大值,之后则下降。另外,在本试验条件下,施加螯合剂均提高了小白菜对Cd的吸收,但高水平的螯合剂处理却导致小白菜死亡;土壤脲酶及过氧化氢酶的活性随着土壤Cd浓度的增加而降低,而种植小白菜后可以增加土壤脲酶及过氧化氢酶的活性,促进酶活性的恢复,说明小白菜具有修复Cd污染土壤的潜力。
Pot experiments were carried out to study the tolerance and enrichment index of Chinese cabbage in different levels of Cd contaminated soil and to apply different levels of chelating agents to strengthen the remediation effect. The results showed that low Cd treatment could promote the plant height and dry weight of Chinese cabbage, while the high Cd treatment showed inhibitory effect. When the Cd concentration was 200 mg / kg, the plant height and dry weight of Chinese cabbage were respectively Which was 26.6% and 42.6% lower than that of the cabbage without cadmium added. The accumulation of cadmium in the plant was greater than the aerial part, and the contents of Cd and Cd in the parts increased with the increase of Cd in the soil. Soil Cd reached the maximum at 150 mg / kg and then decreased. In addition, under the experimental conditions, the application of chelating agents increased the absorption of Cd in Chinese cabbage, but the treatment of high levels of chelators led to the death of Chinese cabbage. The activities of soil urease and catalase increased with the Cd concentration in soil However, the cultivation of Chinese cabbage increased soil urease and catalase activity and promoted the recovery of enzyme activity, indicating that Chinese cabbage has the potential to repair Cd-contaminated soil.