Spatial and temporal variations of microbial properties at different scales in shallow subsurface sediments
- Oak Ridge National Lab., TN (United States); and others
Microbial abundance, activity, and community-level physiological profiles (CLPP) were examined at centimeter and meter scales in the subsurface environment at a site near Oyster, VA. At the centimeter scale, variations in aerobic culturable heterotrophs (ACH) and glucose mineralization rates (GMR) were highest in the water table zone, indicating that water availability has a major effect on variations in microbial abundance and activity. At the meter scale, ACH and microaerophiles decreased significantly with depth, whereas anaerobic GMR often increased with depth; this may indicate low redox potentials at depth caused by microbial consumption of oxygen. Data of CUP indicated that the microbial community (MC) in the soybean field exhibited greater capability to utilize multiple carbon sources than MC in the corn field. This difference may reflect nutrient availability associated with different crops (soybean vs corn). By using a regression model, significant spatial and temporal variations were observed for ACH, microaerophiles, anaerobic GMR, and CLPP. Results of this study indicated that water and nutrient availability as well as land use could have a dominant effect on spatial and temporal variations in microbial properties in shallow subsurface environments. 32 refs., 3 figs., 3 tabs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 576283
- Report Number(s):
- CONF-960539-; ISSN 0273-2289; TRN: 98:000980-0042
- Journal Information:
- Applied Biochemistry and Biotechnology, Vol. 63-65; Conference: 18. symposium on biotechnology for fuels and chemicals, Gatlinburg, TN (United States), 5-9 May 1996; Other Information: PBD: Spr 1997
- Country of Publication:
- United States
- Language:
- English
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