砷、钙对蜈蚣草中金属元素吸收和转运的影响

蜈蚣草是砷的超富集植物和钙质土壤的指示植物。本试验在砂培条件下，研究砷、钙对蜈蚣草吸收和转运必需金属元素K、Mg、Mn、Fe、Zn和Cu的影响。结果表明。提高营养液中的砷浓度显著降低根部Mg和Zn的吸收。但对根部其它元素的浓度没有明显影响；叶柄中的Mn和地上部的Fe浓度因介质中添加砷而显著减少。其它元素在地上部的分布不受抑制。添加砷限制Fe从地下部向地上部转运，但促进其从叶柄向羽叶中运输；另外，还显著促进Mn由叶柄向羽叶和Zn由根向羽叶的转运。提高钙处理浓度对蜈蚣草吸收Fe、Zn、Cu无显著影响，但显著限制K、Mg和Mn的吸收。Mn是研究的6种金属元素中惟一一种明显向地上部转运富集的元素。从根部到羽叶中。金属元素间的相关性增强，在根部Ca与各种金属元素都无相关性；叶柄中Ca和Fe浓度呈极显著正相关；在羽叶中，Ca与K、Mg、Mn和Zn浓度呈显著负相关。

Effects of arsenic and calcium on metal accumulation and translocation in Pteris vittata L.

Soil As contamination, which is dangerous to plants and human and may cause elevation of As concentrations in the surrounding waters, is a widespread and severe environmental problem both in China and in the world. Phytoremediation, which is an emerging plant-based technology for the removal of pollutants, have been successfully applied to remediate heavy metal contaminated soils. Pteris vittata L., an indicator plant for calcareous soils, is an As-hyperaccumulator newly discovered by Chen et al. in China. ...