Abstract: [Objective and Method]In the Populus euphratica original ecological environment,the 4-factor 5-level orthogonal test was designed to discuss the 4 factors 5-level orthogonal test:density, irrigation, fertilization and spraying the amount of fulvic acid. [Result]The results showed that the impact on irrigation water use efficiency of Populus euphratica was the main factors;the order of the intensity of the factors affecting water use efficiency of Populus euphratica was: irrigation frequency> fulvic acid spray volume> density> fertilizer; [Conclusion]the best combination of improving water use efficiency of the Populus euphratica was irrigation cycle 1 time per 16 days, the planting density was 25 plant per pot the concentration of fertilizer was 1 mg/mL, the concentration of fulvic acid spraying was 1.6 mg/mL.

摘要： [目的]提高胡杨幼苗水分利用效率途径.[方法]试验在单因子试验的基础上,根据胡杨生长特点和种植中存在的实际问题,采用密度、灌水周期、施肥浓度和黄腐酸喷施浓度的4因素5水平正交试验.[结果]灌水量是影响胡杨水分利用效率的主要因素;各因素对胡杨水分利用效率影响强度大小的顺序是:灌水频率>黄腐酸喷施量>密度>施肥量.[结论]提高胡杨水分利用效率的最佳组合为灌水周期为13 d,密度25株/盆,施肥浓度1 mg/mL、黄腐酸喷施浓度1.6 mg/mL.