| Název článku: | Dynamika půdní vlhkosti pod mladým douglaskovým porostem s bukem v podhorské oblasti: naměřená data 2012–2019 srovnávaná s literárními údaji |
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| Číslo: | 1 |
| Rok: | 2022 |
| Autor: | František Šach, Vladimír Černohous, Dušan Kacálek, Jan Bartoš |
Douglas-fir (DF) has been recently considered a partial substitution for native conifers attacked by bark beetles following climate change. Given the obvious vulnerability of domestic species to the ongoing climate shifts, it is necessary to study impact of DF on hydroclimatic regime of stands where DF is present. Between 2012 and 2019, a volumetric soil moisture was monitored in four layers of sand-loamy, stony cambisol. DF-dominated planted stand where alternating rows of DF and European beech (EB) reached mean heights of 16 m and 8 m with mean basal areas amounting 34.0 m2 and 3.3 m2 respectively in 17th year of age. The study site is a former meadow at mean altitude of 510 m on slope with NW aspect. The moisture measurements were conducted using three sensors at each soil depths, i.e. 15 cm, 30 cm, 45 cm and 60 cm. Data were processed using an equation allowing us to calculate loss of moisture due to both the deeper groundwater recharge and the evapotranspiration in dormant and growing season, respectively. In the last four out of five growing seasons, the moisture availability limit (11%) has been reached in the surface soil layers (0–20 and 20–35 cm) and its reduced availability has been extended. As soil moisture oscillated seasonally, a falling linear trend was used to approximate the loss of soil moisture at all the depths monitored in dormant and growing seasons. The down-percolating and evapotranspired water amounts decreased at all the soil depths in the period from 2012/2013 to 2018/2019 hydrological years. Soil water outputs showed substantially greater loss attributable to evapotranspiration amounting 161–404 mm (mean value 237 mm) compared to winter ground-water recharge ranging 134–171 mm (mean value 150 mm).
