摘要： 通过盆栽试验研究了不同镉浓度处理下旱莲草的镉富集特性。结果表明：随土壤镉浓度的增加，旱莲草生物量、株高、根长、叶绿素SPAD值、抗性系数都呈下降趋势，而根系和地上部镉含量呈增加的趋势。在土壤镉浓度为大于50 mg/kg时，旱莲草地上部分镉含量均大于镉超富集植物临界值(100 mg/kg)。在不同的土壤镉浓度处理下，旱莲草根系和地上部分镉富集系数(BCF)大于1，但转运系数(TF)小于1。旱莲草地上部分镉积累量最大值为38.06 μg/株(土壤镉浓度为25 mg/kg)。小区试验研究表明，在土壤镉浓度为2.04~2.89 mg/kg时，旱莲草地上部分镉积累量为0.393~0.435 mg/m²。因此，旱莲草是一种镉富集植物，具有较好的镉富集能力，可用于农田镉污染土壤修复。

关键词: 旱莲草, 镉含量, 积累特性, 农田杂草

Abstract: In this study, we grew this plant in soil containing various concentrations of cadmium to further evaluate its cadmium accumulation characteristics.The results showed that the biomass, height, root length, chlorophyll SPAD value and the resistance coefficient decreased with the increase of cadmium concentration in soil, while the cadmium contents in root and shoot of E.prostrata increased.The cadmium contents in shoot and root of E.prostrata exceeded 100 mg/kg when the dose of cadmium was more than 50 mg/kg in soil, and the BCFs of root and shoot were greater than 1 and the TF was less than 1.The maximum of cadmium accumulation in shoot of E.prostrata was 38.06 μg/plant (The dose of cadmium was 25 mg/kg in soil). In the plot experiment, when cadmium concentrations of soil were 2.04-2.89 mg/kg, the cadmium accumulations in shoot of E.prostrata were 0.393-0.435 mg/m².Therefore, Eclipta prostrata L.is a Cd-accumulator plant with better capability and could be used to remediate Cd-contaminated farmland.

Key words: Eclipta prostrata L., Cadmium content, Characteristics of accumulation, Farmland weeds

中图分类号: 

• X503