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Industrial \Iron, manganese plant roots, stems, leaves in the accumulation of a large number of not only affects plant growth and development, and will enter the food chain and endanger human health. Metal present in the soil is often difficult to microbial decomposition and transformation of harm to plants, animals and humans has a hidden, long-term and irreversibility. Physical and chemical methods currently used in the remediation of heavy metal contaminated soil, expensive, damaging the environment, likely to cause secondary pollution, and often does not achieve the purpose of really clear heavy metals. Nearly a decade phytoremediation technology without harming the environment under the conditions of the soil heavy metals to be clear, is a green technology. Phytoremediation process of iron, manganese transfer characteristics depends largely on the chemical form of the media, its existing form in the medium is a measure of the key parameters of metallic iron, manganese environmental effects. In recent years, the chelate Qi (EDTA) induction plays an important role for the repair of metal pollution of the environment, but the less the concentration of EDTA added, and how it affects the mobility of the two metals of the iron, manganese and its absorption plant. In this study, a complete nutrient solution culture rouge grass landscape plants (Rivina humilis L.) as an experimental material of the Fe absorption of Mn2 Combined Stress on the landscape plant rouge grass growth, physiological characteristics, Fe, Mn elements , enrichment and metastasis, as well as the exogenous chelating Qi (EDTA) the Fe.Mn chemical enhancement effect. Different concentrations of Fe2 when Mn2 processing, rouge grass its necessary to maintain normal nutrient absorption and accumulation, their concentrations in ensuring in the rouge Turf normal growth within the concentration range. Experimental results: 1. Rouge grass Fe2, Mn2 pollute the environment, vulnerable to Fe2 poisoned and Mn2 highly resistant, and low concentrations of Fe2, Mn2 could significantly promote rouge grass growth, while high concentrations inhibit their growth. Fe2 to poison the critical concentration to 0.5 mmol · L-1, the concentration of poison tolerance ≤ 1.25 mmol · L-1; the Mn2 poisoned critical concentration for 4mmol · L-1, the poison tolerance concentration is ≤ 8mmol · L-1; Mn2 Fe2 Combined Stress processing, the optimal concentrations of 6 0.5mmol · L-1, 2 1 mmol · L-1 concentration combination of rouge grass poison is the most serious. (2) With Fe, of Mn2 and their Combined Stress concentration increase, rouge grass biomass was then decreased trend, Fe2, Mn2 mouth Mn2 Fe2 most appropriate concentrations were: 0.5mmol · L-1.4mmol · L- 1 and 0.5 mmol · L-1 comparison Fe2 the Mn2 separate and composite stress rouge grass Fe, Mn absorption, accumulation and transfer the amount obtained rouge grass adaptable metal Mn stress environment fe. (3) Add the exogenous EDTA rouge grass biomass in the processing of manganese stress, promote Mn by the Ministry of underground to shoot transfer efficiency, improve rouge grass Mn tolerance and accumulation of skills, including EDTA concentration of 2.5 mmol · L-1 enhanced the best results, so adding chelating agent EDTA rouge grass has great potential for the use of the repair of manganese pollution of the environment. These results indicate rouge grass manganese have a lot of patience and enrichment capacity, the plant biomass, high growth rate, so it may provide a scientific landscape plants for phytoremediation of urban ecological environment ferromanganese pollution and theoretical basis.
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