Research on Water Ecological Adaptability of Winter Wheat Based on Multi-Level Groundwater Control Depth

The water ecological adaptability of winter wheat in multi-level groundwater control depth was quantitatively studied in this paper. Winter wheat, a typical dry crop in Huaibei Plain, was chosen as the research object. The meteorological data and experimental data of the lysimeter in Wudaogou hydrological experimental station were applied to this paper. The typical soil Shajiang black soil in Huaibei Plain was applied to study the limit depth of groundwater utilization for winter wheat. Five buried depths of 0.4, 0.6, 0.8, 1.0 and 1.5 m were established. The water ecological adaptability index model was applied to this paper. The water ecological adaptability of winter wheat in different groundwater depths was analyzed from the coupling degree of water demand and precipitation, the characteristics of water demand precipitation and the yield. The research results showed that the water ecological adaptability of crops was determined by the coupling degree of water demand and precipitation and the crop yield. The water ecological adaptability index of winter wheat increased first and then decreased along with the increasing groundwater depth. The water ecological adaptability index of winter wheat reached the maximum at 1.0 m buried depth, which was 0.442. The maximum index was 1.09~2.19 times that of other buried depths. The water ecological adaptability of winter wheat was the strongest at 1.0 m buried depth. It was most conducive to crop growth at 1.0 m buried depth. Hence, the theoretical basis for improving the utilization efficiency of shallow groundwater can be applied to Huaibei Plain. The results showed that the water ecological adaptability of crops was determined by the coupling degree of water demand and precipitation and the yield. © 2021. All Rights Reserved.