青铜峡灌区冬季储水灌溉越冬期土壤水分变化

Research on Soil Moisture Variation of Winter Storage Irrigation During Winter Season in Qingtongxia Irrigation Area

针对冬季储水灌溉问题,通过2012年越冬期的大田田间试验,采用称重法和TDR法测定土壤总含水量和冻土液态含水量,分析了青铜峡灌区在同一灌溉定额、不同农田处理措施条件下,冬季储水灌溉对越冬期农田土壤水分变化和农田土壤储水量的影响。结果表明:免耕覆盖能够提高土壤含水量、保持农田土壤水分;整个越冬期不同农田处理措施的土壤总含水量变化不大,冬灌的土壤剖面水分可以持续到翌年春播之前。

Aimed at winter storage irrigation problem, field experiment was carried out in Qing tongxia irrigation area during the winter period of 2012. An experimental observation about influence of winter storage irrigation on field soil moisture change and field soil water content of winter pe- riod under the same irrigation quota and different levels of agricultural measures were performed by using the methods of weighing and time-domain reflectometer in measurements of soil water content and liquid water content of frozen soil. The results show that no-tillage with mulch can enhance soil moisture and conserve filed soil water. The soil water content of different levels of agricultural measures are changed little throughout the winter period, soil profile of winter irrigation water can be kept until the following spring sowing.