外源镉对暗棕壤呼吸强度和土壤微生物群落的影响  

Influence of exogenous cadmium on respiratory intensity and microbial community of dark brown soil

作　　者：陆文龙[1] 郭景海[1] 

机构地区：[1]吉林化工学院环境与生物工程学院,吉林吉林132022

出　　处：《广东农业科学》2013年第23期47-49,共3页Guangdong Agricultural Sciences

基　　金：吉林省科技发展计划项目(201105012)

摘　　要：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0．5～3．0mg／kg时，随着培养天数的增加，特别是在培养14d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—10．0mg／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；10mg／kg外源镉处理培养7、14、21、28、42d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 influence of exogenous cadmium on respiratory intensity and microbial community of dark brown soil were studied by adding different concentration of heavy metal cadmium. The results indicated that： the soil respiration had a significant weakening trend in the same culture days with exogenous cadmium content increasing; the soil respiration intensity decreased obviously with the increase of culture time, especially after 14 days when the soil exogenous cadmium content was in the range of 0.5 -3.0 mg/kg, While the soil respiration had not obvious variation with the increase of culture time when the exogenous cadmium content was in the range of 5.0-10.0 mg/kg. The soil microbial community decreased significantly and were much lower than that of the control treatment in the same culture days with the increase of soil exogenous cadmium content, the soil microbial community declined significantly with culture time increasing for all exogenous cadmium treatment. Comparing with the control, the number of soil microbial community were only 46.43%, 32.26%, 28.74%, 27.39% and 24.62% of that of the controls in the culture days of 7, 14, 21, 28 and 42, respectively at 10 mg/kg of exogenous cadmium content. It indicated that higher concentration of cadmium in dark brown soil had a significant inhibitory effect on soil microbial growth.

关 键 词：暗棕壤 外源镉 土壤呼吸 微生物群落 

分 类 号：S154.36[农业科学—土壤学]