六价铬对薏米人工湿地微生物群落数量的影响

Effects of Cr6+ on microorganism population in

关键词:  六价铬  人工湿地  真菌  细菌  放线菌

Key words:  hexavalent chromium  constructed wetland  fungi  bacteria  actinomycetes

摘要:

通过桶栽构筑微型模拟垂直流薏米人工湿地(CAW),以1/2 Hoaglands营养液为营养源,在营养液中添加不同浓度的Cr⁶⁺(0,5,20,40,60 mg/L,以K₂Cr₂O₇配置),各浓度处理均以不种植薏米湿地(NPW)为对照,以研究铬(Cr⁶⁺)对薏米人工湿地基质真菌、细菌及放线菌群落结构数量的影响。结果表明:(1)真菌、细菌、放线菌的数量在薏米人工湿地(CAW)中明显多于无植物对照处理(NPW);(2)中低浓度(5、20 mg/L)Cr⁶⁺对CAW真菌,对NPW细菌、放线菌数量有促进作用,薏米人工湿地微生物对低中浓度的Cr⁶⁺胁迫有一定的耐受能力。

Abstract:

The effects of hexavalent chromium on fungi,bacteria and actinomycetes communities were studied by constructed a minitype tubs-vertical flow Coix aquatica wetland(CAW),adding 1/2 Hoaglands nutrient solution plus 0,5,20,40,60 mg/L K₂Cr₂O₇ respectively,and constructing a no plant wetland(NPW)which corresponding nutrient and hexavalent chromium concentrations as control experiment. The results as follows:(1)The populations of fungi,bacteria and actinomycetes in CAW were bigger than that in NPW;(2)Low or middle level hexavalent chromium concentrations(5,20 mg/L)had stimulative effect on fungi in CAW and bacteria,actinomycetes in NPW. Microorganism population in C.aquatica constructed wetlands had the tolerant ability under the low or middle(5,20 mg/L)Cr⁶⁺ stress.