Physiology and microbial community structure in soil at extreme water content
Uhlirova, E.(Akademie Ved, Ceske Budejovice (Czech Republic). Ustav Pudni Biologie)E-mail:[email protected] | Elhottova, D.(Akademie Ved, Ceske Budejovice (Czech Republic). Ustav Pudni Biologie) | Triska, J.(Akademie Ved, Ceske Budejovice (Czech Republic). Ustav Krajinne Ekologie) | Santruckova, H.(Akademie Ved, Ceske Budejovice (Czech Republic). Ustav Pudni Biologie)
A sandy loam soil was brought to 6 water contents (13-100% WHC) to study the effects of extreme soil moistures on the physiological status of microbiota (represented by biomass characteristics, specific respiration, bacterial growth, and phospholipid fatty acids (PLFA) as stress indicators) as well as microbial community structure (assessed using PLFA fingerprints). In dry soils, microbial biomass and activity declined as a consequence of water and/or nutrient deficiency (indicated by PLFA). These microbial communities were dominated by G+ bacteria and actinomycetes. Oxygen deficits in water-saturated soils did not eliminate microbial activity but the enormous accumulation of poly-3-hydroxybutyrate by bacteria showed the unbalanced growth in excess carbon conditions. High soil water content favored G- bacteria.
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