论文部分内容阅读
通过实验室模拟,研究了不同浓度的外源重金属镉对暗棕壤呼吸强度和土壤微生物群落的影响。结果表明,在相同培养天数内,随土壤外源镉含量的增加土壤呼吸强度均呈明显减弱趋势;当土壤外源镉含量为0.5~3.0 mg/kg时,随着培养天数的增加,特别是在培养14 d后,土壤呼吸强度亦呈减弱趋势,而在土壤外源镉含量为5.0~10.0 mg/kg时,随培养天数的增加土壤呼吸强度变化不显著。在相同培养天数内,随土壤外源镉含量的增加,土壤微生物群落呈明显减少趋势,且均显著低于对照;而对于所有外源镉处理,随培养天数的增加,土壤微生物群落亦呈显著减少趋势;10 mg/kg外源镉处理培养7、14、21、28、42 d土壤微生物群落数量分别为对照的46.43%、32.26%、28.74%、27.39%和24.62%,说明较高浓度的镉污染对土壤微生物生长具有显著的抑制作用。
Through laboratory simulation, the effect of different concentrations of exogenous heavy metal cadmium on respiration intensity and soil microbial community of dark brown soil was studied. The results showed that in the same culture days, the respiration intensity of soil decreased obviously with the increase of soil exogenous cadmium content. When the content of exogenous cadmium was 0.5-3.0 mg / kg, with the increase of culture days, especially After 14 days, soil respiration intensity also showed a weakening trend. However, when the amount of exogenous cadmium was 5.0 ~ 10.0 mg / kg, the soil respiration intensity did not change significantly with the increase of days. In the same incubation days, with the increase of soil exogenous cadmium content, the soil microbial community decreased obviously, and were significantly lower than the control; for all exogenous cadmium treatment, with the increase of culture days, soil microbial community also showed significant Decreasing trend. The number of soil microbial communities at the treatments of 10, 14, 21, 28, and 42 d after cadmium supplementation with 10 mg / kg were 46.43%, 32.26%, 28.74%, 27.39% and 24.62% Cadmium pollution has a significant inhibitory effect on soil microbial growth.