Tungsten Effects on Microbial Community Structure and Activity in a Soil
| Autor: | D. R. Johnson, L. E. Winfield, Anthony J. Bednar, C. M. Reynolds, D. B. Ringelberg, L. S. Inouye |
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| Rok vydání: | 2009 |
| Předmět: |
Environmental Engineering
chemistry.chemical_element Biomass Management Monitoring Policy and Law Tungsten complex mixtures chemistry.chemical_compound Tungstate Nitrogen Fixation Botany Soil Pollutants Waste Management and Disposal Chemical composition Soil Microbiology Water Science and Technology chemistry.chemical_classification Azotobacter vinelandii Acetylene Fatty Acids Fatty acid equipment and supplies Pollution chemistry Microbial population biology Environmental chemistry Nitrogen fixation Helianthus Diazotroph Oxidation-Reduction Biomarkers |
| Zdroj: | Journal of Environmental Quality. 38:103-110 |
| ISSN: | 0047-2425 |
| DOI: | 10.2134/jeq2008.0022 |
| Popis: | Tungsten, once deposited onto a soil as a result of private, industrial, and military activities, may persist as tungstate anion or, via polymerization, as a variety of poly-tungstate species, each with varying solubility and soil sorption characteristics. In this study, the impact of weathered tungsten on a soil microbial community was measured. Fatty acid analyses indicated that weathered tungsten ator =2500 mg kg(-1) was associated with a significant increase in microbial biomass and that concentrations up to 6500 mg kg(-1) did not result in a significant decrease in measured biomass, relative to the control. Analysis of cellular fatty acids also identified significant microbial community shifts between 0 and 325, 1300 and 2600, and 3900 and 6500 mg W kg(-1) soil. In general, the positive effect of tungsten on microbial biomass coincided with an increase in Gram-negative bacterial fatty acids, whereas fatty acids indicative of actinomycetes and Gram-positive bacteria were more abundant at the highest soil tungsten concentrations. The weathered tungsten also inhibited N2 fixing activity of a free living diazotroph ator =1300 mg W kg(-1) soil. These results indicate that tungsten in soil can alter both the structure and the function of an indigenous soil microbial community. |
| Databáze: | OpenAIRE |
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