干旱区生态环境知识资源中心

Using pot experiments and the HYDRUS-1D model, the irrigation timing and amount for 1-year old Populus euphratica (P. euphratica) seedlings in the field was determined without considering lateral runoff. Six irrigation treatments were applied, among them, the non-irrigated treatment was set up not only as a comparison but to determine the uptake reduction function. According to the experimental results, the optimum irrigation under pot was first determined, secondly, the application of HYDRUS-1D was tested by the comparison of the measured and simulated actual evapotranspiration, third, the cumulative deep drainage in the field during the growth period was calculated by HYDRUS-1D, and finally, the optimum irrigation amount was estimated from the actual evapotranspiration, deep drainage and precipitation during the normal hydrological year. The results obtained show that the timing of irrigation in the field is similar to that in pot considering precipitation; the optimum amount of irrigation is 166 mm in a normal hydrological year.