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Ecology Vol.24, No.3, p.304-313, 2005
|Title: TEMPORAL DYNAMICS OF SOIL WATER IN OAK FOREST STAND OF SOUTHERN SLOVAKIA|
|Author: LADISLAV TUŽINSKÝ|
|Abstract: Time and spatial variability of the soil water depends on the weather characteristic course, on
soil hydrophysical characteristics and on forest stand transformation influence. Analysis of soil
water available for plants during the growing season shows that the water dynamics in the soil
under the oak forest stand is most intense in the upper (0–50 cm) layers of the soil profile. Water
uptake and loss from this soil layer results in transition of the soil water from one category to
another, especially due to the osmotic preassure of the soil and the water active transport via fine
roots. At the beginning of the growing season capillary movable water category prevails in the
soil profile with easy available water supply. Radiation and air temperature increase leads to the
gradual decrease of soil water content. Increase of evapotranspiration (> 5 mm.day-1) is folowed
by the process of water supply decrease. During the culminating drying off period (July, August)
the soil water supply decreases to the category of capillary immovable water. During extremely
dry season the water supply in the soil can decrease to the wilting point level. Soil water becomes
capillary bound and non-available for plants. Loss of contact between the fine roots and water
results in decrease of transpiration and assimilation. Premature fall off of physiologically weakened
leaves is recorded. Under such conditions the oak resistance towards damaging factors is decreased.
|Keywords: forest stand, soil water, hydrolimits, available water|
|Year: 2005, Volume: 24, Issue: 3||Page From: 304, Page To: 313|