不同微生物制剂对土壤中结合态Zn稳定性的影响

为了探索修复Zn污染土壤的有效途径,在4种含Zn量分别为97.4、300、600、900mg/kg的土壤中分别添加木霉菌(40g/kg)和AB菌(40mL/kg)后种植苋菜。测定结果显示,添加木霉的4种土壤中有效态Zn含量比对照分别减少了1.75%、13.9%、19.47%、14.86%,苋菜中Zn的富集量比对照分别提高了56.4%、37.4%、25.23%和47.06%;添加AB菌的4种土壤中有效态Zn含量比对照分别提高了15.79%、31.02%、26.55%和17.75%,苋菜中Zn的富集量比对照分别提高了47.73%、33.8%、29.99%、41.17%。这些结果表明AB菌和木霉菌对土壤中有效态Zn含量的影响存在差异,不同微生物菌剂对土壤重金属有效态的影响不同,选择合适的微生物菌剂,对重金属污染土壤的微生物修复具有重要意义。

Effect and Mechanism of Different Microbial Preparations on Stability of Zn in Soil

In order to explore the effective ways of restoring soils polluted by Zn,Trichoderma(40 g/kg)or AB(40 mL/kg)preparations were added to soils with 97.4,0,600 and 900 mg/kg of Zn before planting amaranth.The results showed that the available Zn contents in soils added with Trichoderma decreased by 1.75%,13.9%,19.47%,14.86% respectively and the accumulation of Zn in amaranth increased by 56.4%,37.4%,25.23% and 47.06% compared with control.The available Zn contents increased 15.79%,31.02%,26.55% and 17.75% after adding AB preparation and the Zn accumulation in amaranth increased by 47.73%,33.8%,29.99% and 41.17% compared with control.These results showed that Trichoderma and AB preparation have different effects on soil available Zn contents.So choosing the suitable microorganisms according to the different effects of microbial inoculants on bioavailability of heavy metals has significant impact on the microbial remediation of heavy metal polluted soils.