Sampling analysis results of soil moisture in Weihe area

The study of soil moisture is an important issue for agricultural operators before agricultural cultivation. Scientists used a soil moisture recorder to sample and analyze different soil moisture test points in the Weihe River Basin, aiming to obtain regional variations of soil moisture. The situation is reported below.

1. Due to the shallow groundwater level, the soil moisture content is relatively high, and there is a big difference compared with the dry soil moisture. From the point of view of the sampling point, the lack of soil moisture data during the grain filling and ripening stages of wheat in May 2012 may be deficient relative to the entire growth cycle of the plant. This will be reinforced in future studies. However, as a whole, it can explain the changes in soil moisture from the plant to the jointing process.

2. The change of soil moisture is affected by the hysteresis effect, which basically accords with the distribution law that the soil moisture content increases first and then decreases from the surface layer to the deep layer. However, due to the change of groundwater, there is no obvious dry soil, but in different months, such as wasteland and cultivated land. During the first sampling, the water content in the topsoil was relatively high. This was caused by the inflow of mud in the south of Gansu Province before the soil was collected in October. Long-term rainfall made the low-lying areas unable to drain water and the surface soil water content was lower. high.

3. The soil moisture content under the different land use patterns from the surface layer to the deep layer showed the trend of increasing first, then decreasing and then increasing. Because the vegetation water consumption was different, the soil water content varied from 0 to 120 cm, and the overall performance was Fenhe farmland is greater than wasteland. The vertical change of soil moisture content has a distinct level. The variation coefficient of soil moisture under different land use patterns decreases with the increase of soil depth. Affected by the use of soil moisture by vegetation roots, the active layer of the wasteland is 0 to 120 cm, and the active layer of cultivated land is 0 to 100 cm. Their relatively stable layer is 300 to 500 cm.

4. As the sampling point is close to the Weihe River and the groundwater level is shallow, the recharge of the subsurface soil water by the groundwater is very obvious, and the change of the soil moisture occurs mainly in the range of 150-200cm.

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