Popis článkuSrovnání denní dynamiky průtoků pahorkatinných mikropovodí v několikadenních periodách beze srážek.
[Streamflow dirunal dynamics of upland microwatersheds during precipitation-free periods] 190 - 196.
|Název článku:||Srovnání denní dynamiky průtoků pahorkatinných mikropovodí v několikadenních periodách beze srážek|
|Autor:||Petr Kupec, Jan Deutscher|
During the 2011 vegetation season, streamflow, precipitation and temperature were measured in two experimental upland microwatersheds with different vegetation cover (forest, grassland). Since both catchments are located in similar natural conditions, the differences between forested and afforested area were related to the effects of woody vegetation. During precipitation-free periods lasting several days, a trend of decreasing streamflow during sunlit part of the day was observed on both localities. Its mean amplitude reached 27 % and 17 % of initial morning maximum for afforested and forested catchment, respectively. During the night, streamflow increased back to its morning maximum in the forested catchment, while it reached 90% only in the afforested one. We explain these differences by the ecosystem effects of woody vegetation, mainly the ability to decrease transpiration losses during the hottest parts of the day, which results in a potential to function as a source of water during the night.