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The determination of water content in different climatic regions and different regions was conducted using a soil moisture fastness tester. The results showed that the characteristics of the vertical profile of the multi-year average in different climatic regions were: Poorly soil-water stability in severely water-deficient areas in north central Hebei and northeastern Yunnan. , The coefficient of variation is large. The severe water shortage in shallow soil mainly occurs in spring and late spring and early summer, and the deep soil is also in a state of water shortage all the year round. The seasonal water shortage in central and eastern Hebei is mainly in water shortage in May and June. The deep soil moisture showed relatively good performance in the eastern area of ​​Jidong, which was relatively poor in Yuzhong area, while the middle area of ​​Yuzhong area in the low soil moisture area was deeper than that in the eastern Jilin province. There was no obvious soil water shortage period in the soil water-conserving area and the humid area, and the soil layer above 30 cm was found. The soil moisture is relatively stable and is transported to the deep layer; there are obvious seasonal changes in the relatively low value areas of soil moisture, and the climate zones differ in time and depth.
Although we used the soil moisture quickness tester to discuss the characteristics of soil moisture and climate in the rain-fed agriculture area of ​​the Loess Plateau, the impact of groundwater and irrigation on soil moisture has not yet been involved; in addition, due to the relatively short history of soil moisture data, With the use of existing data, data use has not been unified since the beginning of the year. In the analysis of time series trends, there may be a long time evolution trend; the impact of soil moisture on industrial and agricultural production in different climatic regions needs further study.
Soil moisture is a very important factor in agricultural production. In the Loess Plateau of Gansu, soil moisture changes are the basic conditions for agricultural production in the region. The soil moisture content can generally be measured using a soil moisture quickness tester. The summary shows that the soil moisture in the Loess Plateau of Gansu decreases from the southwest to the northeast, with a dry tongue from the north to the south in the middle, and the drought center is in the north of central Yunnan and Liupan Mountain. There is a difference in the degree of soil water shortage on the east and west sides, and the east is slightly better, with a difference of about 2% in the same latitude. The trend of soil moisture in the seasonal soil water shortage area in the Loess Plateau is obvious, and there is a clear upward trend in the Yuzhong District, while there is a significant downward trend in the Jidong District, and there is no significant trend in other climate regions.
September 24, 2021