| Název článku: | Vodohospodářská účinnost zalesněných pahorkatinných mikropovodí s rozdílnou hlavní dřevinou v bezesrážkových periodách |
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| Číslo: | 2 |
| Rok: | 2019 |
| Autor: | Petr Kupec, Jan Deutscher, Libor Školoud |
The article presents comparative analysis of water use efficiency (WUE) of forested micro-watersheds located in the area of Forest Training Enterprise Masarykův Les Křtiny (FTE MF), Czech Republic, during precipitation-free periods of a part of the 2015 growing season. The micro-watersheds can be characterized as forested upland watersheds of relatively equal size (less than 1 square km) and terrain morphology with different tree species composition (with different dominant species – more than 50%: spruce (Picea abies), beech (Fagus sylvatica) and mixed five tree species, none of them over 30%). Water use efficiency was evaluated as the mean decrease of average daily streamflow in the discharge profile of the catchment recipients occurring during precipitation-free periods that lasted several days. At this time, the streamflow dynamics is influenced the most by the evapotranspiration of surrounding vegetation, and its effect on streamflow can be best observed. Four such precipitation-free periods were identified during the study period; two of them within the middle of growing season, and the other two at its end. Two of the precipitation-free periods were characterized as long lasting (more than 15 days), the other two were of short duration (not longer than 6 days). Our results indicate that WUE of upland forested micro-watersheds can be significantly different according to the different dominant tree species in the forest stands and depending on the duration of the precipitation-free period and the part of the growing season. Generally, in the conditions of uplands, the lowest values of WUE were obtained in the case of the spruce dominated catchment, while the best for the beech dominated one.
