4种改良剂对铅锌尾矿污染土壤中光叶紫花苕生长及重金属吸收特性的影响

通过盆栽试验研究了铅锌尾矿污染土壤中施用有机肥、石灰、蛭石和白云石等4种改良剂对光叶紫花苕生长发育、叶绿素及重金属Cu、Cd、Pb、Zn积累特性的影响,并分析了施用改良剂后土壤pH和有效态重金属含量的变化。结果表明,与对照相比,不同改良剂及其不同施用水平均能不同程度地提高土壤pH,显著降低土壤各重金属有效态含量,并显著抑制了Cd、Pb向光叶紫花苕地上部转移,降低了重金属在光叶紫花苕植株地上部的积累,改善了光叶紫花苕的生长和发育,光叶紫花苕株高、地上部鲜重和地下部鲜重、叶绿素含量均有不同程度增加,其中株高和地上部鲜重增加达到显著水平。4种改良剂的不同处理水平对光叶紫花苕地下部重金属含量影响均达显著水平。

Effect of different amendments on growth and heavy metal accumulation in Vicia villosa Roth varglabrescens cv Yunguangzao in soils polluted with lead/zinc mine tailings

A pot experiment was conducted to determine the effect of four amendment substances (organic manure, lime, vermiculite and dolomite) on growth and heavy metal (Cu, Cd, Pb and Zn) accumulation in Vicia villosa Roth varglabrescens cv Yunguangzao in soils contaminated with lead /zinc mine tailings. Changes in soil pH and available heavy metal content induced by the amendments were also analyzed. The results show that the four amendments significantly increase soil pH while reducing available heavy metal content in soil. Hence transportation of Cd and Pb from the root to shoot of V. villosa is limited, which reduces heavy metal accumulation in the shoot. The amendments significantly improve growth of V. villosa, while increasing plant height, shoot and root fresh weight and chlorophyll content of V. villosa. The induced changes in plant height and shoot fresh weight are significant (P < 0.05) compared to CK. Amendments significantly affect heavy metal accumulation in the root of V. villosa. The effects of the four amendments on root heavy metals content in V. villosa are also significant.