| Effects of Heavy Metal Contamination on Microbial Biomass and Community Structure in Soils |
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| 引用本文： | 杨元根,刘丛强,徐磊,吴攀,张国平. Effects of Heavy Metal Contamination on Microbial Biomass and Community Structure in Soils[J]. 中国地球化学学报, 2004, 23(4): 319-328. DOI: 10.1007/BF02871303 |
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| 作者姓名： | 杨元根 刘丛强 徐磊 吴攀 张国平 |
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| 作者单位： | Institute of Geochemistry，Chinese Academy of Sciences，Institute of Geochemistry，Chinese Academy of Sciences，Guizhou Academy for Environmental Science Research and Design，Institute of Geochemistry，Chinese Academy of Sciences，Institute of Geochemistry，Chinese Academy of Sciences Guiyang 550002，China，Guiyang 550002，China，Guiyang 550002，China，Guiyang 550002，China，Guiyang 550002，China |
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| 基金项目： | 中国科学院资助项目，State Oversea Foundation |
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| 摘 要： | Theeco environmentalpollutioncausedbyminingdevelopmentisaworldwideproblem ,whichhasarousedever increasingattentionofscientists.Inadditiontovegetationdestructionanderosionofcultivatedlanddirectlycausedbyminingdevelopment,scientistshaveplacedmorefocusontheenvironmentalproblemsinducedbythereleaseofharmfulsubstances ( particularlyheavymetals) .Especiallyundersurfaceconditions,thepiled upminewastes (minetailings)undergoweatheringundertheactionofaseriesofgeochemicalfactorssuchasthemineralogyofmineta…
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| 关 键 词： | 重金属污染 微生物密度 群落结构 土壤学 |
Effects of heavy metal contamination on microbial biomass and community structure in soils |
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| Yang Yuangen,Liu Congqiang,Xu Lei,Wu Pan,Zhang Guoping. Effects of heavy metal contamination on microbial biomass and community structure in soils[J]. Chinese Journal of Geochemistry, 2004, 23(4): 319-328. DOI: 10.1007/BF02871303 |
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| Authors: | Yang Yuangen Liu Congqiang Xu Lei Wu Pan Zhang Guoping |
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| Affiliation: | (1) Institute of Geochemistry, Chinese Academy of Sciences, 550002 Guiyang, China;(2) Guizhou Academy for Environmental Science Research and Design, 550002 Guiyang, China |
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| Abstract: | Zinc smelting near Magu Town, Hezhang County, Guizhou Province, resulted in vegetation destruction and the accumulation of heavy metals, to varying extent, in adjacent soils, where up to 162.2-877.9 mg·kg -1 Zn, 37.24-305.6 mg·kg -1 Pb, and 0.50-16.43 mg·kg -1 Cd, were detected. These values greatly exceed the background levels of these elements in soils. The concentrations of heavy metals (particularly Pb, Zn) were positively correlated with the contents of Fe-2O-3 and Al-2O-3 in the soils, showing that Fe and Al oxides play an important role in retaining heavy metals. Chemical fractionation indicates that Pb and Zn were associated mainly with Fe and Mn oxides and minerals, whereas Cd was dominated by exchangeable form. Microbial biomass in the soils was relatively low, in the range of 57.00-388.0μg C·g -1, and was negatively correlated with heavy metal concentrations in the soils. The correlation coefficient of microbial biomass C to Zn concentrations in the soils was as high as -0.778 (p<0.01), indicating that the heavy metal contamination has toxic effects on microorganisms in soil. The results of Biolog measurements demonstrated that there were no significant changes in microbial community structure in the heavy metal contaminated soils. Gene fragments were similar to one another after the DNA was extracted from soil microbes and experienced PCR (polymerase chain reaction) and DGGE (denaturing gradient gel electrophoresis) reactions. These results indicated that light heavy-metal pollution may not result in any change in soil microbial community structure. |
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| Keywords: | fractionation heavy-metal contamination microbial biomass microbial community structure soil |
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