期刊
GEOPHYSICAL RESEARCH LETTERS
卷 36, 期 -, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2009GL038695
关键词
-
资金
- National Science Foundation [EAR-0433729]
- USGS Toxic Substances Hydrology Program
We recorded bulk electrical conductivity (sigma(b)) along a soil column during microbially-mediated selenite oxyanion reduction. Effluent fluid electrical conductivity and early time sigma(b) were modeled according to classic advective-dispersive transport of the nutrient medium. However, sigma(b) along the column exhibited strongly bimodal breakthrough which cannot be explained by changes in the electrical conductivity of the pore fluid. We model the anomalous breakthrough by adding a conduction path in parallel with the fluid phase, with a time dependence described by a microbial population-dynamics model. We incorporate a delay time to show that breakthrough curves along the column satisfy the same growth model parameters and offer a possible explanation based on biomass-limited growth that is delayed with distance from influent of the nutrient medium. Although the mechanism causing conductivity enhancement in the presence of biomass is uncertain, our results strongly suggest that biogeochemical breakthrough curves have been captured in geoelectrical datasets. Citation: Slater, L. D., F. D. Day-Lewis, D. Ntarlagiannis, M. O'Brien, and N. Yee (2009), Geoelectrical measurement and modeling of biogeochemical breakthrough behavior during microbial activity, Geophys. Res. Lett., 36, L14402, doi:10.1029/2009GL038695.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据