基于HYDRUS-2D的负压微润灌土壤水分运动模拟

为研究负压微润灌不同技术参数组合下的土壤水分运动过程,以土箱试验实测含水率为依据,构建并验证了基于HYDRUS-2D的负压微润灌土壤水分运动反演模型,并结合反演模型对负压微润灌多种组合情景的土壤湿润体模拟结果和典型设施作物根系分布特征及需水规律,探究适宜于不同设施作物的负压微润灌技术参数组合.结果表明:采用HYDRUS...

Simulation of Soil Moisture Movement under Negative Pressure Micro-irrigation Based on HYDRUS-2D

It has important guiding significance for the selection of technological parameters of negative pressure micro-irrigation for different crops, by understanding the characteristics of soil water movement under different combinations of technical parameters of negative pressure micro-irrigation. The soil water movement inversion model under negative pressure micro irrigation based on HYDRUS-2D model was constructed and validated by parameter inversion based on the measured moisture data in the soil bin test. The combination of negative pressure micro-irrigation technical parameters suitable for different facility crops was explored by combining the simulation results of the inverse model for much wetter characteristics of negative pressure micro-irrigation and the root distribution characteristics and water demand pattern of typical facility crops. The results showed that the HYDRUS-2D inversion model can better simulate the characteristics of the soil wetter under different water supply heads of negative pressure micro-irrigation. The determination coefficients and NSE between simulated and measured values of soil wetting distance (horizontal distance, vertical upward distance and vertical downward distance), water content and cumulative infiltration reached above 0.98 and 0.77, respectively. Both experimental and simulation results showed that there was a negative correlation between the negative pressure of the water supply head and soil water content, the cumulative infiltration and wetting distance in different directions under negative pressure micro-irrigation conditions. In addition, a suitable range of technical parameters for negative pressure micro-irrigation for different facility crops was formulated, based on the simulation results of the inverse model for different wetting bodies of negative pressure micro-irrigation and the root distribution characteristics and water demand pattern of typical facility crops. These results were important for the selection of technical parameters for negative pressure micro-irrigation in agricultural production and the promotion of new water-saving irrigation techniques.