【摘要】 通过室内模拟的方法,研究外源砷对土壤微生物数量的影响。结果表明,对经驯化后的无污染土壤而言,低浓度外源砷对异养型微生物的生长有刺激促进作用,随着浓度的增加又表现为抑制作用;在相同的外源砷浓度下,砷对自养型微生物有更强的抑制作用。微污染土壤中的微生物数量高于受砷严重污染区土壤的;而当向其中加入外源砷后,微污染土壤中的微生物数量明显减少。更多还原

【Abstract】 Arsenic pollution of soil has been a quite serious problem in some areas of China.The impact of adding arsenic(the mass fraction was 0 mg/kg,500 mg/kg,1 000 mg/kg,2 000 mg/kg) on the change of soil microbial populations were studied under laboratory conditions.The results showed that the growth of auxohetertrophs was stimulated by adding low concentration of arsenic,but it was inhibited when increasing the concentration of arsenic.At the same concentration of additional arsenic,a stronger inhibiting effect was found on auxoautotrophs than on auxohetertrophs.Under the stress of arsenic,the microbial populations of auxoautotrophs and auxohetertrophs both decreased firstly and then increased.更多还原