大羽藓(Thuidium cymbifolium)对Pb、Cd污染的指示与累积作用研究

在不同浓度的Pb、Cd 溶液中培养15 d 后, 随着培养浓度的增加, 大羽藓表现出不同程度的伤害症状, 主要是植株体失绿, 到高浓度时开始死亡。测定藓体内的Pb、Cd 含量, 结果表明:大羽藓对Pb、Cd 有较强的吸收累积能力, 特别是对Pb 的累积。Pb、Cd 的累积量随着培养浓度的增大而增加。对复合污染的研究显示出:复合污染中Pb、Cd 累积量远远大于单一污染, Pb、Cd 在大羽藓体内的累积表现为协同效应。

Study on indication and accumulation of Thuidium cymbifolium to lead and cadmium pollution

Cultivated in different lead and cadmium solution for 15 days, T. cymbifoliumshowed different poisonous symptoms. The main appearance was losing green, even died in higher stress concentration. At the same time, we measured the accumulation of lead and cadmium in mosses, the results showed: this moss had strong absorbing ability to lead and cadmium, especially to lead. The contents of lead and cadmium increased with the increasing of stress concentration. In joint pollution, the contents were higher than those of single pollution, the relationship of lead and cadmium appeared synergistic.