微塑料对超富集植物少花龙葵Cd累积的影响

Effects of Polyethylene on Cd Accumulation of Hyperaccumulator Solanum photeinocarpum

为研究微塑料对超富集植物修复重金属污染土壤的影响,文章通过温室盆栽实验,以镉(Cd)超富集植物少花龙葵为研究对象,探究聚乙烯(PE)微塑料颗粒(0、0.01%、0.1%、1%)(以w/w计)以及Cd(0、5、15、30 mg/kg)复合作用对少花龙葵生长及Cd累积影响。结果表明:与单一Cd处理相比,0.1%和1%的PE能显著降低土壤pH,提高Cd的生物有效性;5 mg/kg的Cd与PE复合处理显著降低了少花龙葵的生物量,增加了少花龙葵组织中Cd的含量,且Cd含量随着PE浓度的增加显著增加;但所有处理对少花龙葵Cd的累积量均无显著影响。研究表明,少花龙葵的生长及对Cd的吸收会因PE浓度、Cd浓度的不同而异。深入研究微塑料对超富集植物修复效率的影响,对拓展土壤重金属污染植物修复的实际应用具有重要意义。

In order to study the effect of microplastics on the remediation of heavy metal polluted soil by hyperaccumulators,the effects of polyethylene(PE)microplastic(0,0.01%,0.1%,1%w/w)and Cd(0,5,15,30 mg/kg)on the growth and Cd accumulation of Solanum photeinocarpum were studied by pot experiment in greenhouse.The results showed that 0.1%and1%PE could significantly reduce soil pH and improve the bioavailability of Cd compared with single Cd treatment.The combined treatment of 5 mg/kg Cd and PE significantly reduced the biomass of S.photeinocarpum,increased the Cd content in the tissue of S.photeinocarpum,and the Cd content increased with the increase of PE concentration.However,all treatments had no significant effect on the accumulation of Cd in S.photeinocarpum.The results showed that the growth and absorption of Cd by S.photeinocarpum were different with PE concentration and Cd concentration.In a word,in-depth study of the impact of microplastics on the efficiency of hyperaccumulation phytoremediation is of great significance to expand the practical application of phytoremediation of soil heavy metal pollution.