碱性矿化水淋洗对土壤盐碱化及小麦生长的影响

为探讨不同矿化度的水对土壤盐渍化的影响及相应的淋洗分数,采用土柱模拟方法,以小麦为指示作物,设计1.0 g/L,1.5 g/L两种矿化度,按3750 m3/hm2灌溉量,分一水、二水两种灌次,秋后进行人工淡水淋洗。结果表明,在半干旱气候条件下,开发碱性矿化水灌溉矿化度不宜超过1.5 g/L,否则有引起碱化的危险。干旱期用碱性矿化水灌溉抗旱时,在同等灌水量的情况下,一水灌溉比二水灌溉积盐轻。各种人工淋洗处理比CK洗盐效果好,其中以等量淋洗综合效益最好。

Effects of Leaching of Alkaline Mineralized Water on Soil Salinization and Wheat Growth

The tests were studied through soil column simulation, indicated by wheat, and under the conditions of irrigated water with 3750 m3/hm2, of mineralization degree with 1.0 g/L and 1.5 g/L, of irrigation frequency with once and twice in arid seasons, and of leaching with freshwater in autumn. The results show that with brackish water irrigation the degree of mineralization is no more than 1.5 g/L under semi-arid climate conditions, otherwise, it brought about alkalization. The tests also show that with the same amount of irrigation water, one irrigation accumulates less salt in soil than twice during arid periods. And the leaching effects of all artificial treatments are better than that of natural rainfall.