Abstract
In the present study, evapotranspiration (ET) data from a common reed-dominated wetland and its meteorological controls was analysed using measured ET (ET m) in compensation evapotranspirometers. Six seasons in the time period between 2003 and 2012 were assessed with the objective of converting theoretical observations into long-term practical use. They reveal the effects of annual fluctuations and allow for a more exact understanding of the results of ET losses, which remain an elusive and substantial part of the hydrologic budget particularly in wetland habitats. Daily measured ET rates were strongly influenced by weather variables causing considerable variation of ET characteristics between the two distinguished season types. The results of multiple stepwise regression analysis showed that the major meteorological elements impacting the sum of seasonal ET was much higher in the warm growing seasons (857 mm), due to increased available energy for ET, than in the cool season (385 mm). The sum of average ET totalled 778.6 mm over measurements. A simplified water budget analysis confirmed that adequate water volume, caused by precipitation, entered the Kis-Balaton wetland (KBW) area during the cool season. Conversely, in warm seasons, only 21.5 % of total ET resulted from rainfall, accentuating its seasonality in wetland. This information about annual variability of long-term ET values would assist in finding an ideal solution for determining the proper water level needed. The current balance of habitat types in wetland should be permanently assessed by selection of the suitable water level in order to sustain the most appropriate wetland ecological conditions.
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This paper was published in the framework of project TÁMOP-4.2.2.B-15/1/KONV-2015-0004 ‘Support of scientific groups at University of Pannonia’. The project is possible with the support of the European Union and with co-funding from the European Social Fund.
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Anda, A., Soos, G. & Teixeira da Silva, J.A. Practical use of Phragmites australis to study evapotranspiration in a wetland zone of Lake Balaton (southwest Hungary). Theor Appl Climatol 127, 899–909 (2017). https://doi.org/10.1007/s00704-015-1679-4
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DOI: https://doi.org/10.1007/s00704-015-1679-4