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开展田间试验研究微咸水滴灌条件下不同盐分离子在土壤中的分布特征。试验采用5个水平的微咸水灌溉处理:电导率分别为1.1dS/m(K1),2.2dS/m(K2),2.9dS/m(K3),3.5dS/m(K4)和4.2dS/m(K5),重复3次,按随机区组布置。试验结果表明:滴灌条件下各种盐分离子的迁移速度与分布特性不同,Ca2+、Mg2+与SO42-易于被灌溉水分淋洗,主要分布在湿润体外围,而HCO3-、Na+与Cl-主要分布在湿润体内部。生育期内土壤剖面上的平均盐分含量没有增加,但对土壤结构与作物有重要影响,Cl-、Na+、HCO-3有增加的趋势。
Field experiments were conducted to study the distribution of different salt ions in soil under the condition of drip irrigation with brackish water. The experiment was conducted with five levels of brackish water irrigation: the conductivities were 1.1 dS / m (K1), 2.2 dS / m (K2), 2.9 dS / m / m (K5), repeated 3 times, arranged by random block. The results showed that the transport speed and distribution characteristics of various salt ions were different under drip irrigation conditions. Ca2 +, Mg2 + and SO42- were easily rinsed by irrigation water, mainly distributed in the periphery of wetting body, while HCO3-, Na + and Cl- Moist body inside. The average salt content of soil profile did not increase during the growth period, but had an important effect on soil structure and crop, while Cl-, Na + and HCO-3 tended to increase.