植物根表铁膜的形成及其营养与生态环境效应

Formation of iron plaque on root surface and its effect on plant nutrition and ecological environment

论述了根表铁膜的形成条件、形态和矿物学组成及在根表的沉积位置 ,讨论了根表铁膜作为铁库改善植物Fe营养、影响P、Zn等营养状况的植物营养效应以及铁膜通过吸附或共沉淀的外在抗性机制和竞争代谢敏感位点的内在抗性机制 ,在提高植物抵抗Cu、Ni、Cd、As等重金属毒害和强酸。

This paper illustrated the conditions of iron plaque formation on root surface,the morphology,mineralogical composition and deposition site of the plaque,and its function as a Fe reservoir in supplying Fe nutrient and affecting the uptake of other nutrients such as phosphorus and zinc.The environmental and ecological role of the plaque in inhibiting the uptake and translocation of heavy metals such as Cu,Ni,Cd and As through absorption or co precipitation was called external tolerance mechanism,while its competition with heavy metals for metabolically sensitive sites in plants was called internal tolerance mechanisms.These two mechanisms help plant survive in high acidic and low carbon environment.