Dynamics of the soil moisture potential and temperature in the podsolic soil

Abstract

Temperature is an important thermodynamic parameter and functionally related to soil water potential and dramatically affecting it. All types of decrease in potential of moisture occur in connection with increase in moisture content. Increase of its content comes in connection with an atmospheric precipitation and by way of pulling up the moisture from underlying layers. Dynamics of potential and temperature at various levels of a soil profile revealed. The influence of soil temperature in the range of soil moisture is high positive values on the dynamics of soil water potential. Dynamics of the soil moisture potential and temperature in a layer of the soil were analysed in various levels of a soil profile: 0.05-0.12 m. 0.3-0.37 m., 0.5-0.57 m., 0.7-0.77 m. Results showed all types of decrease in the potential of moisture (sluggish and fast, slight, and essential) occurred in connection with increase in moisture content. Increase in its contents comes in connection with an atmospheric precipitation and a way of pulling up of moisture from underlying layers. Decrease in the potential of moisture (at constant humidity) at temperature increase, is explained by increase of mobility and activity of moisture. Daily changes of the potential of moisture are small and are in limits of 1-3 kPa. Daily changes of temperature of the soil decrease both from top to down a soil profile, and within a day with cooling of free air: 1.5oC in top and 0.4-0.3oC in soil sublayers