咸水灌溉条件下干旱区盐渍土壤盐分变化研究

新疆盐渍化土地面积大,在盐渍化土壤上种植耐盐小麦,利用盐化水灌溉具有重要意义。试验采用随机定位、分季节取土样、室内化学分析土壤盐分含量的方法,研究土壤盐分时空变化,其结果为:当土壤盐分含量为5~12g/kg时,盐化水多次灌溉可使土壤盐分减少,尤其在夏季晒垡灌溉后,耕作层土壤盐分可显著降低;土壤盐分降低显著与否,与本身盐分含量无关;土壤盐分变化可涉及100cm深度,但变化达显著水平的仍然是表层。

Changes in Soil Salinity of Saline Soil Irrigated with Saline Water in Arid Area

Xinjiang has a vast area of the saline soil, where the cultivation of salt-tolerant wheat using saline water for irrigation is of great significance to exploitation of the resources. Soil samples were collected by season from randomly chosen stationary sampling sites for analysis of salt contents in lab to study tempo-spatial variation of soil salinity of the soil. The results display that the soil salinity of the soil, 5 ~ 12 g/kg in soil salinity, has been reduced as a result of frequent irrigation with saline water. The effect is more significant especially when the fields are deep plowed exposing the soil to insolation before irrigation in summer. Significance of the reduction of soil salinity has nothing to do with the original salt content of the soil. The variation of soil salinity may reach as deep as 100 cm, but is significant only at the surface layer.