滨海盐渍土壤中不同类型盐生植物富集镉的效应

发布时间：2018-08-04 14:15

【摘要】：为了利用被镉污染的滨海盐渍土壤,通过实验对比分析3种不同类型盐生植物对盐渍土中镉的富集效应,以期初步探明不同类型盐生植物在镉污染盐渍土壤修复中的效果。选择的3种盐生植物类型是:聚盐盐生植物,泌盐盐生植物和避盐盐生植物。通过温室盆栽实验,将植物在不同镉含量的盐渍土壤中种植培养60 d,测定和分析不同类型盐生植物对镉的生物浓缩因子、转移系数以及植株内地上部分和根部生物量和镉含量的变化。结果表明,不同镉含量的土壤对碱蓬和芦苇的生长影响较小,对二色补血草的生长影响较大。不同镉含量的土壤中,芦苇地上部分镉的生物浓缩因子变化差异不显著,并且其地上部分吸收镉的百分率较高。碱蓬和芦苇的转移系数大于二色补血草的转移系数,并且碱蓬的转移系数在不同镉含量的土壤中变化不显著;二色补血草的转移系数随着土壤中镉含量的增加而显著增大。3种盐生植物中,碱蓬最具修复镉污染盐渍土壤的潜力,这可能和它是聚盐盐生植物的生理类型有关。芦苇整个植株的地上部分富集镉的总量在3种植物中是最高的,因此,芦苇在镉含量较低时也可以做为镉污染盐渍土壤的修复材料。
[Abstract]:In order to make use of the coastal saline soil polluted by cadmium, the effects of three different halophytes on cadmium enrichment in saline soil were analyzed through experiments, in order to preliminarily explore the effects of different types of halophytes on the remediation of cadmium contaminated saline soil. Three types of halophytes were selected: polyhalophytes, halophytes and halophytes. The plant was cultivated in saline soil with different cadmium content for 60 days, and the bioconcentration factors of cadmium in different types of halophytes were determined and analyzed by pot experiment in greenhouse. The change of transfer coefficient, aboveground biomass and cadmium content in plant. The results showed that the soil with different cadmium content had little effect on the growth of Suaeda salsa and Reed, but had a great effect on the growth of Bicolor bicolor. There was no significant difference in the bioconcentration factors of CD in the aboveground part of Reed, and the percentage of CD uptake in the aboveground part of Reed was higher than that in the soil with different CD content. The transfer coefficient of Suaeda salsa and Reed was higher than that of Broca bicolor, and the transfer coefficient of Suaeda salsa had no significant change in the soil with different cadmium content. Among the 3 halophytes, Suaeda salsa has the most potential to repair cadmium contaminated saline soil with the increase of cadmium content in soil, which may be related to its physiological type of polyhalophyte. The total amount of cadmium enriched in the whole aboveground part of Reed plant is the highest among the three plants. Therefore, Reed can also be used as the remediation material of cadmium contaminated saline soil when the cadmium content is low.
【作者单位】：天津师范大学城市与环境科学学院;
【基金】：国家自然科学基金项目(40940010,40973078)
【分类号】：S156.42

【参考文献】