| 河北省石家庄市南部污灌区厚层包气带污染物自然衰减的微生物作用潜力评价 |
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| 关键词:microbial process potential natural attenuation thick vadose zone wastewater-irrigated area |
| 基金项目:中国地质调查局地质调查项目(编号: 1212010634610);国家自然科学基金项目(编号: 40472200) |
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| Assessment of Microbial Process Potential for Natural Attenuation of Contaminants in the Thick Vadose Zone beneath the Wastewater- irrigated Area of Southern Shijiazhuang City, Hebei Province |
| The purpose of this study is to investigate the abundance, distribution, activity and diversity of microbes in nearly 30 m thick vadose zone beneath the wastewater-irrigated area of southern Shijiazhuang to assess microbial process potential for natural attenuation of contaminants of the thick vadose zone using traditional cultivation technique and modern phosphor lipid fatty acid (PLFA), Biolog and 16 S rRNA gene denaturing gradient gel electrophoresis (DGGE) techniques. Sediment samples were collected by core drilling for analysis of physical, chemical and microbial properties. The results show that the top soil layer (5~20 cm) is characterized by high content of bacteria, high activity, plenty of metabolizable types and coexistence of culturable heterotrophic bacteria and autotrophic bacteria, aerobic heterotrophic bacteria, facultative anaerobic heterotrophic bacteria and obligate anaerobic heterotrophic bacteria. The lower vadose zone below the top soil layer is characterized by lower microbial content, lower activity, fewer metabolizable types relative to the top soil layer and harbors mainly culturable aerobic heterotrophic bacteria, facultative anaerobic heterotrophic bacteria and aerobic autotrophic bacteria. Moreover, these bacteria change with lithology, show low content and activity in the sand layer and the heavy clay layer, and increase in content and activity in the clayed silty layer. The results obtained by the authors show that the top soil layer has high potential for biological natural attenuation, and the lower vadose zone still has such potential, and especially has higher potential in the lower layer with high DOC (Dissolved Organic Carbon) content. |
| ZHANG Cui-yun,ZHANG Sheng,HE Ze,YIN Mi-ying,NING Zhuo.2014.Assessment of Microbial Process Potential for Natural Attenuation of Contaminants in the Thick Vadose Zone beneath the Wastewater- irrigated Area of Southern Shijiazhuang City, Hebei Province[J].Acta Geoscientica Sinica,35(2):223-229. |
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