Study on Soil Evaporation of Water Storage Pit Irrigation under Different Irrigation Amount

In order to study the effect of different irrigation amount on the evaporation of the orchard trees under water storage pit irrigation.The daily soil evaporation intensity of the surface in different distance from the tree and the pit wall in different depths of the pit are measured by micro-lysimeters respectively.The meteorological elements of the surface and the pit are also measured by nk3500 handheld weather instrument and meteorological station.Under water storage pit irrigation,the surface soil evaporation has the similar regulation with different irrigation amount.It decreases with time and be stable finally.Both of the pit wall soil evaporation and the total evaporation have the similar regulation with different irrigation amount,it increases to the maximum value,and then decreases with time and be stable finally.Both of the surface soil evaporation intensity and the pit wall soil evaporation intensity are significant with different irrigation amount.Under different treatment(W90,W150,W210),the total evapotranspiration is 41 920,45 045,45 447mm3,respectively.The total evapotranspiration of W210 treatment was 1.8times bigger than that of W90 treatment,it increases gradually with the increase of irrigation amount.Under water storage pit irrigation,the irrigation amount has obvious effect on the evaporation intensity.The results provide important scientific basis for revealing water-saving mechanism and improving the theory of the water storage pit irrigation.