微咸水灌溉对冬枣根区土壤水盐动态及效益的影响

Effects of Saline Water Irrigation on Water-salt Dynamic in Root District and Winter Jujube Yield

为了探究在微咸水滴灌与微咸水微喷灌条件下的土壤水盐运移规律、分布特征、根区盐分盈亏状况,以及两种灌溉模式对冬枣效益的影响,在沾化地区建立微咸水灌溉试验。观测结果表明,经过一个冬枣树生长周期,微咸水滴灌可使表层土壤含水率上升2.6%,全盐含量下降0.815 g/kg,微咸水微喷灌可使表层土壤含水率上升0.7%,全盐含量下降0.648 g/kg;冬枣效益方面,两种灌溉模式在可食率、含水量、糖度上相差不大。因此,微咸水滴灌模式保障冬枣效益的同时,在保持土壤含水率及减轻土壤盐渍化程度上效果优于微咸水微喷灌模式,更适合当地冬枣种植。

In order to explore the rules of water-salt transportation in soil, distribution characteristic, the profit or loss of salinity in root dis- trict, and the effects of drop irrigation and micro-spray irrigation with saline water on winter jujube yield, a saline water irrigation test was conducted in Zhanhua district. The results showed that ： after a growth cycle of winter jujube, saline water drop irrigation could increase the water content of surface soil by 2.6%, decrease the total salt of surface soil by 0.815 g/kg; saline water micro-spray irrigation can increase the water content of surface soil by 0.7%, decrease the soil total salt of surface soil by 0.648 g/kg; in terms of the winter jujube yield, the edible rate, the water content, sweetness are almost the same under the two irrigation modes. Compared with saline water micro-spray irrigation, saline water drop irrigation not only can ensure the winter jujube yield, but also has a better effect on holding the water content of soil and decreasing the soil salinization. It＇s more suitable for winter jujube planting in Zhanhua district.