镉低积累药用植物盆栽及大田筛选试验

目的 比较不同植物对重金属镉积累能力差异,筛选出镉低积累药用植物种类.方法 以夏枯草、益母草、薄荷为供试材料,通过盆栽和大田试验,采用原子吸收光谱法测定植物中镉的含量.结果 三种植物积累镉的能力存在差异,益母草>薄荷>夏枯草.益母草在镉污染土壤中其地上部分镉含量随土壤镉浓度增高而增高,而生长不受影响,属于抗性植物.在镉胁迫下,薄荷、夏枯草生长受到抑制,植物中镉含量较低,且随土壤镉浓度增加植物中镉含量变化较小,属于镉低积累植物.结论 益母草为镉高积累植物,且生长不受影响,可以作为富集植物治理镉污染;薄荷中镉主要积累在地下部分,而其以地上部分入药,夏枯草为镉低积累植物,两者均为可在镉污染地区种植的药用植物.

Pot and Field Screening Experiment of Low Cadmium Accumulation Medicinal Plants

Objective The accumulation of heavy metal cadmium capacity of different plants was compared to screening out the low accumulation of cadmium medicinal plants. Methods Choose Prunella vulgaris, motherwort, mint as test-ed materials, the contents of cadmium in plants were determined by using atomic absorption spectrometry. Results There was a difference in accumulating cadmium of the three plants, motherwort > mint > Prunella vulgaris. The cadmium accumulation in overground part of motherwort was increasing with content of cadmium in soil, while the growth of motherwort, belonging to the resistance plant, was not affected. Under cadmium stress, the growth of mint and Prunella vulgaris, which belong to the low cadmium accumulating plants, was inhibited. Conclusion Motherwort, a high cadmium accumulation plant, can be as hyperaccumulator to govern cadmium pollution, and its growth is not affected. The cadmium accumulation of mint is mainly, the overground part as the medicine, Prunella vulgaris, as low cadmium accumulation plant, both of them is suit-able to be planted in cadmium polluted areas.