Hg^(2+)胁迫培养对水生植物根际微生物的影响

The Effects of Rhizosphere Microorganisms on Aquatic plants after Hg^(2+) Stress

采用水培方法,在实验室条件下,选择不同浓度的Hg2+对大薸(Pistiastratiote)、慈姑(Sagittaria sagittifolia L)和穗状狐尾藻(Myriophyllum spicatum Linn.)进行胁迫培养,通过测定三种水生植物根系的微生物区系及与氮循环细菌的数量变化,分析三种水生植物根际微生物对重金属Hg2+的耐受性,微生物区系结构和与氮循环有关的细菌的数量变化。结果发现,Hg2+胁迫改变了水生植物根系微环境,对微生物区系结构产生明显的影响;氮循环细菌生理类群的数量随着外源重金属Hg2+浓度变化表现出一定的特殊性和复杂性。

We have done an experiment through adopting the water cultivating technique in the laboratory ,choosing different concentrations of Hg2 ＋ to stress training on the Pistiastratiote,Sagittaria sagittifoliaL and Myriophyllum spicatum Linn. Through analyzing the tolerance of rhizosphere microbiological on Hg2 ＋ ,the floristic structure of rhizosphere microbiological and the change of nitrogen cycle bacteria ,we found that the aquatic plant roots micro-environment and the floristic structure of microbiological can be changed under Hg2 ＋ stress; The changes of nitrogen cycle bacteria are indicative of particularity and complexity of the concentration of heavy metals Hg2＋.