植物根表铁锰氧化物胶膜的环境生态作用

The Role of iron and manganese plaques on wetland plant roots in environment and ecology

许多湿地、水生植物根系都具有向根际环境释放氧气和氧化物,在根表和根际形成铁、锰氧化物胶膜的能力。因其所具有的特殊的物理或化学结构,植物根表的铁锰氧化物胶膜在环境生态中起重要作用。文章综述了植物根表铁锰氧化物的形成与特征,对有害金属和类金属污染物、有机污染物的吸附和富集作用,对富营养化水体的净化作用,以及提高植物的耐酸和耐贫瘠能力。借助新技术或研究手段强化铁、锰氧化物胶膜对湿地或水体有害金属和有机污染物的调控作用,是今后的发展方向。

The roots of many wetlands and aquatic plants species are able to release oxygen and/or oxidant into the rhizosphere, resulting in the precipitation of iron and manganese oxides at the surface of roots, also referred to as Fe-plaque in the case of Fe, As Fe-plaque have special physical or chemical feature, it has great effect on ecological environment. This paper reviews the formation and feature of iron and manganese plaque, alleviation of metal （loid） toxicity via adsorption and accumulation, eutrophication purification, plant acid proof and barren resistance. It will be the new investigations into remediation role of Fe and Mn plaqUes via new methods.