What factors affect the dynamic changes in soil moisture?
The dynamic change of soil moisture has great influence on agricultural production and farmland soil moisture. What factors will cause changes in soil moisture? Soil moisture meter can help us to solve this problem.
1. The change of farmland soil moisture is more active than that of arid regions, especially in the middle and late stages of crop growth, but the recovery time of soil moisture is longer than that of bare land. The effect of different cropping systems on soil moisture dynamics has the greatest impact on soil moisture changes in the first mixed wheat and millet wheat rotations compared to the pea and wheat rotation crops and rape crop rotation.
2. In general, the soil moisture dynamics in an area can be divided into four periods: the relatively stable water period, the slow water consumption period, the large water loss period, and the water recovery period. The four periods of bare land are consistent with the climate change, and the farmland is synchronized with the crop water demand during the crop growth period.
3. Different hydrological years have a greater impact on soil moisture dynamics. After a cyclic cycle, the soil water content in Fengshui is not only restored, but also the soil water content is greatly increased. The drought year is the opposite. In the wet years, the soil moisture cycle has been at a relatively high level, and the drought year is the opposite. In the wet years and dry years, the soil moisture changes more slowly than in the flat year. The water consumption in the entire cycle is equivalent to the annual precipitation. Soil moisture recovery is not affected by crop (annual), cornice, and fertility conditions.
4. According to soil moisture changes in the vertical profile of the soil, it can be divided into three levels: the active layer, the secondary active layer, and the relatively stable layer. The annual active layer of Fengshui is only 10cm, and below 10cm is a relatively stable layer. The active layer of dry year is the same as that of the normal water year, but the secondary active layer is 10cm, and the 40cm and below are relatively stable layers. Seen from the overall situation, the 0-200crs soil water activity level is greater than the dry year; drought year is greater than the flood year.
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