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Functional microbial community response to nutrient pulses by artificial groundwater recharge practice in surface soils and subsoils

SCHÜTZ, K. and Kandeler, E. and Nagel, P. and Scheu, S. and Ruess, L.. (2010) Functional microbial community response to nutrient pulses by artificial groundwater recharge practice in surface soils and subsoils. FEMS microbiology ecology, Vol. 72, H. 3. pp. 445-455.

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Official URL: http://edoc.unibas.ch/dok/A5841334

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Abstract

Subsurface microorganisms are essential constituents of the soil purification processes associated with groundwater quality. In particular, soil enzyme activity determines the biodegradation of organic compounds passing through the soil profile. Transects from surface soil to a depth of 3.5m were investigated for microbial and chemical soil characteristics at two groundwater recharge sites and one control site. The functional diversity of the microbial community was analyzed via the activity of eight enzymes. Acid phosphomonoesterase was dominant across sites and depths, followed by L-leucine aminopeptidase and b-glucosidase. Structural [e.g. phospholipid fatty acid (PLFA) pattern] and functional microbial diversities were linked to each other at the nonwatered site, whereas amendment with nutrients (DOC, NO3 ) by flooding uncoupled this relationship. Microbial biomass did not differ between sites, whereas microbial respiration was the highest at the watered sites. Hence, excess nutrients available due to artificial groundwater recharge could not compensate fr the limitation by others (e.g. phosphorus as assigned by acid phosphomonoesterase activity). Instead, at a similar microbial biomass, waste respiration via overflow metabolism occurred. In summary, ample supply of carbon by flooding led to a separation of decomposition and microbial growth, which may play an important role in regulating purification processes during groundwater recharge.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Ehemalige Einheiten Umweltwissenschaften > Biogeographie (Nagel)
UniBasel Contributors:Schütz, Kirsten and Nagel, Peter
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Elsevier
ISSN:0168-6496
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:14 Sep 2012 07:21
Deposited On:14 Sep 2012 07:10

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