| Title | Effects of cattle-lagoon slurry on a soil microbial community can be observed until depths of 50m |
| Publication Type | Journal Article |
| Year of Publication | 2011 |
| Authors | Hermann G, Shore LS, Steinberger Y |
| Journal | Applied Soil Ecology |
| Volume | 49 |
| Pagination | 32-39 |
| Date Published | 2011/09/01/ |
| ISBN Number | 0929-1393 |
| Keywords | Cattle slurry, Lagoon, microbial biomass, Microbial community vertical distribution, Microbial functional diversity, soil microbial community |
| Abstract | The large amount of effluent generated by concentrated animal feeding operations (CAFOs) has raised concerns about contamination of groundwater and pollution of streams by compounds that penetrate the vadose zone. However, the possibility that a microbial community in the vadose zone under cattle-slurry lagoons (CSLs) may also be affected has not been considered. In the present study, we investigated the influence of long-term (30 years) accumulation of cattle slurry on the vertical distribution of a soil microbial community (microbial biomass [MB], CO2 evolution, substrate utilization ability), until a 50-m depth, compared to a control site. Total soluble nitrogen (TSN) was found to be elevated fourfold, and MB was found to be threefold higher under the CSL compared to a control site. In general, the increase in MB is associated with higher soil moisture and higher nitrogen content. Substrate utilization ability was found to be significantly higher in a CSL in comparison to the control site. At the CSL site, a higher utilization of aromatic carboxylic acids typical of cattle slurry was obtained in the deeper soil layers (7–30m), indicating a degree of microbial adaptation even at these depths. The soil layers under the CSL were more dynamic as the microbial functional diversity was significantly different between the layers, while no such difference was seen at the reference site. Our results, therefore, suggest that the infiltration of cattle slurry can affect the microbial community throughout the vadose zone. We also suggest that activity of the microbial community, as characterized by its substrate utilization ability, can be a bioindicator for anthropogenic activities and environmental changes even at depths below the rhizosphere (30cm).
|
| Short Title | Appl. Soil Ecol. |
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