【摘要】 土壤重金属污染是全球面临的一个重要环境问题。本文通过数值模拟,探讨了低吸收植物、普通植物和超富集植物3种植物根系对重金属在土壤中运移的影响。污染初期,有植物土柱的污染程度均高于无植物土柱。随着污染的持续,超富集植物土柱污染程度最先低于无植物土柱,然后普通植物土柱污染程度也开始低于无植物土柱。超富集植物土柱重金属浓度分布很快达到稳定,而普通植物土柱重金属浓度分布范围和峰值仍随时间而增大。低吸收植物土柱污染程度最为严重,重金属浓度峰值会超过污染源输入浓度,且峰值下移。更多还原

【Abstract】 Heavy metal pollution is an important environmental problem in global.This paper discussed the effects of three plant roots as low level absorption plant,common plant and hyper-accumulative plant on the heavy metal transporting in soil by the mumerical simulation.In the initial stage,the contamination degree of soil columns with plant was higher than soil column without plant.As pollution went on,the contamination degree of soil column with super-accumulative plant was lower then that of soil column without plant first and so did the soil column with common plant later on.The concentration distribution in the soil column with super-accumulative plant was soon steady,while the scope and peak value in the soil column with common plant became larger with time.The contamination degree of soil column with low level absorption plant was the highest,and the peak value was greater than the input concentration and moved downward.更多还原