针对宁夏青铜峡树新林场低洼盐碱地地下水位高且盐分难以淋洗等问题，在田间设置不同埋深的暗沟（T1-1.5 m、T2-1.2 m、T3-0.9 m和T4-0.6 m）及对照试验（CK-无暗沟），分析各处理灌水后第5、15、25 d 0~100 cm土层土壤的水分和盐分含量变化，并测定向日葵生长指标及产量。结果表明，相比CK，合理铺设暗沟能够增加低洼盐碱地排水速率，有效减少土壤中水溶性盐分含量，改善作物生长环境，提高作物产量，且灌水后第25 d较第5 d各处理0~100 cm土层土壤水分和盐分含量相对变化率分别表现为：T2>T1>T3>CK>T4，T2>T3>T1>T4>CK。各处理向日葵籽粒产量表现为：T2>T1>T3>T4>CK。综上，本试验1.2 m埋深的暗沟排水脱盐效率最佳，向日葵长势及产量最好。

The groundwater level of the saline-alkali wetland is high and the salt is difficult to be leached in Shuxin forest farm, Qingtongxia, Ningxia, China. Aiming at this problem, buried ditches with different depths (T1-1.5 m, T2-1.2 m, T3-0.9 m, and T4-0.6 m) and control tests (CK-no ditches) were set in the field. After irrigation, the changes of soil water and salt content in 0~100 cm soil layer were studied on the 5th, 15th and 25th day, and the growth index, yield of sunflower were measured. The results showed that compared with CK, the suitable ditch could increase the drainage rate of saline-alkali wetland, effectively reduce the content of water-soluble salt in the soil, improve the growth environment of crops, and increase crop yield. Compare the relative change rate of soil moisture and salinity in 0~100 cm soil layer of each treatment on the 25th day and the 5th day after irrigation, it showed T2>T1>T3>CK>T4 and T2>T3>T1>T4>CK, respectively. The seed yield of sunflower after treatment was T2>T1>T3>T4>CK. In summary, it could be concluded that when the buried depth of the ditch was 1.2 m, the effect of drainage and salt exclusion was the best, the growth and yield of sunflower was the best.