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采用盆栽试验,研究无柄小叶榕(Ficus concinna var.Subsessilis)对盐碱地土壤重金属Cd和Cu的富集和转运能力,并探讨投加生物表面活性剂鼠李糖脂(RL)对无柄小叶榕生长及其吸收Cd、Cu的影响.结果表明,人工模拟盐碱环境下无柄小叶榕能在不同浓度Cd、Cu单独或复合投加胁迫下正常生长,且体内重金属含量随投加浓度增大而升高,均表现为根>地上部分;无柄小叶榕对Cd和Cu具有较强的富集能力,Cd的最大生物富集系数(BCF)为4.52±0.73,Cu为2.1±0.18,BCF值随着重金属投加浓度的增大逐渐减小,Cd、Cu转移系数(TF)均小于1;在Cd 50 mg·kg~(-1)、Cu 400 mg·kg~(-1)下的修复率最高分别为4.07%和2.66%;投加鼠李糖脂可以显著提高无柄小叶榕体内重金属的含量,土壤Cd 25 mg·kg~(-1)时,根部Cd含量最大提高了2.38倍,Cu 50 mg·kg~(-1)时根部Cu含量最大提高了1.91倍.综上,无柄小叶榕对温州重金属污染的盐碱地有很好的修复潜力,投加生物表面活性剂可有效提高无柄小叶榕对重金属Cd和Cu的吸收富集效率.
Pot experiments were conducted to study the enrichment and transport of heavy metal Cd and Cu in saline-alkali soil by Ficus concinna var. Subsessilis. The effects of bio-surfactant rhamnolipid (RL) Growth and the absorption of Cd and Cu.The results showed that A. ficus could grow normally under the different concentrations of Cd and Cu alone or in combination under the conditions of simulated saline-alkali environment, and the content of heavy metals in the body increased with increasing concentration While the increase was root> aerial part; Ficus microcarpa was rich in Cd and Cu, the maximum bioaccumulation coefficient (BCF) of Cd was 4.52 ± 0.73, Cu was 2.1 ± 0.18, BCF The values of Cd and Cu were all less than 1 with the increase of heavy metal concentration. Under the conditions of Cd 50 mg · kg -1 and Cu 400 mg · kg -1 The highest repair rates were 4.07% and 2.66%, respectively. The addition of rhamnolipid could significantly increase the content of heavy metals in Ficus microcarpa, and the Cd content in roots increased 2.38 times at Cd 25 mg · kg -1 , The content of Cu in the root increased up to 1.91 times when Cu 50 mg · kg -1 .Therefore, Scutellaria barbata has a very good effect on the heavy metals polluted saline-alkali land in Wenzhou Repair potential, dosing biosurfactant can effectively improve the absorption and enrichment efficiency of Ficus microcarpa Ficus Cd and Cu.