Author/Editor		Gaberščik, Alenka; Urbanc-Berčič, Olga; Martinčič, Andrej
Title		The influence of water level fluctuation on the production of reed stands (Phragmites australis) on intermittent lake Cerkniško jezero
Type		članek
Source		In: Cristofor S, Sarbu A, Adamescu M, editors. Proceedings of the International workshop and 10th macrophyte group meeting IAD-SIL; 1998 Aug 24-28; Danube Delta, Romania. Bucharest: Editura Universitatii din Bucuresti,
Publication year		2000
Volume		str. 29-33
Language		eng
Abstract		Intermittent lake Cerknisko jezero is world famous carstic phenomenon. The lake area is covered mainly with wetland and amphibious vegetation, among which the common reed (Phragmites australis) is prevailing. Water level fluctuations, which have shown different pattern during the last years, are closely related to the amount and annual distribution of precipitation in the watershed. Dry periods that use to occur in summers, become more often in winters. They are also shorter than previous ones. It has been noticed that long-term floodings depress the development of the wetland vegetation during the vegetative period. Hydrological changes in Lake Cerknica could be recognised as a natural mechanism, which maintains the stability of this ecosystem. Evaluation of reed production at three locations of the lake, which differ according to the average level of water table were carried out to assess the influence of water level on reed production. In 1997 the analysis of the vitality of root system was performed, as well. The first location was usually dry, the second one was a transition from dry land to water, while the third was flooded or dry, depending on the time of the year. The measurements in 1997 showed obvious decrease in reed biomass in comparison to the preliminary results gathered in 1986 and 1987, but the results obtained on the beginning of vegetative period in 1998 were much more promising.
Descriptors		FRESH WATER PLANTS ECOSYSTEM PLANT SHOOTS BIOMASS PLANT ROOTS PLANT LEAVES ELECTRON TRANSPORT FORMAZANS