چکیده (انگلیسی):

The monitoring period shows that the matric potential (Ψm) in the HillField increased with depth during winter time and vice versa in summer. It appears that the transition occurred in the first three weeks of May through the soil remained wetter at depths of 70and 90cm in the lower stations (4 and 5) but not for the top stations. In summer, the soil was wetter at 30 cm depths after heavy rainfall but the effect did not go deeper than 50 cm. The total water potential (Ψw) is the driving force of water flow, at the same depth in the different stations (slope position) showing that the general direction of water flows is from the top to the bottom of the field. Although the (Ψm) was high at the bottom of the field for depth 5 cm, the total water potential (Ψw) was lower at bottom and higher at the top field.