生物质炭对铅锌复合污染土壤修复机理的研究

为研究生物质炭对铅锌复合污染土壤修复的机理,以松木棒炭、玉米秸秆炭、秸秆块炭、花生壳炭、木质颗粒炭和机制木棒炭为重金属钝化剂,以铅锌复合污染土壤为对象,利用盆栽试验研究了不同原材料制成的生物质炭对重金属污染土壤pH、有机质、小白菜体内Pb、Zn含量的影响。结果表明:施用生物质炭可以显著提高重金属污染土壤pH值、有机质含量,施用玉米秸秆炭的效果最佳,小白菜地上部Pb、Zn含量与对照相比显著降低65.3%和41.6%。由此可见,生物质炭是一种能有效降低作物中重金属含量及减轻作物受到的重金属毒害的重金属钝化材料。

In order to study the mechanism of remediation of lead-zinc contaminated soil by material carbon,pine stick carbon,corn straw carbon,straw block carbon,peanut shell carbon,wood granular carbon and mechanism stick carbon were used as heavy metal passivators,and lead-zinc compound polluted soil was taken as the object.Pot experiments were conducted to study the effects of biomass charcoal made from different raw materials on the contents of pH,organic matter,lead and zinc in heavy metal contaminated soil.The results showed that the application of biomass carbon could significantly increase the pH value and organic matter content of heavy metal contaminated soil,and the application of corn straw carbon had the best effect.the contents of lead and zinc in the aboveground part of Brassica chinensis L.were significantly decreased by 65.3%and 41.6%compared with the control.It can be seen that biomass carbon is a kind of heavy metal passivation material which can effectively reduce the content of heavy metals in crops and reduce the toxicity of heavy metals to crops.