Avtor/Urednik		Urbanc-Berčič, Olga; Gaberščik, Alenka
Naslov		Microbial activity in the rhizosphere of common reed (Phragmites Australis) in the intermittent lake Cerkniško jezero
Tip		članek
Vir		In: Vymazal J. Wetlands: nutrients, metals and mass cycling. Leiden: Buckhuys publishers,
Leto izdaje		2003
Obseg		str. 179-90
Jezik		eng
Abstrakt		The intermittent lake Cerkniško jezero is an ecosystem with extreme water level fluctuations that constitute the most conspicuous feature and the driving force of the processes in the ecosystem. Extended area of the shallow lake is mainly covered by wetland vegetation, the common reed (Phragmites australis) being a prevailing species. Alternation of dry and wet periods drives the processes in soil, and affects the mineralization of organic matter. The influence of different water regime and types of soil on ETS-activity was estimated at four reed stands in the lake. Significant differences among the locations were obtained. The highest activity at 0.23 mg 02 g-1 DM h-1 was detected in terrestrial stand at Dujice, supported by the highest content of organic matter (up to 60 %). In the other three stands the mineral content in a sediment was much higher and the organic layer thinner, therefore the ETS-activity was much lower. Monthly monitoring carried out at Dujice revealed variation in microbial activities among months and in the depth profile. The lowest values of ETS - activity (below 0.04 mg O2 g 1 DM h-1) were determined during cold period. No correlation was found between ETS-activity and the availability of nutrients. All forms of nutrients (nitrate, nitrite, ammonium, and soluble phosphorus) were constantly present. Their concentrations varied and were not related to the water content in soil.
Deskriptorji		FRESH WATER WATER MICROBIOLOGY ECOSYSTEM WATER POLLUTANTS GEOLOGIC SEDIMENTS PLANTS ELECTRON TRANSPORT PHOSPHATES NITRATES AMMONIA NITRITES