Study on Soil Moisture in Loess Plateau of Gansu Province Using Soil Moisture Tester
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The soil moisture in the Loess Plateau of Gansu decreases from southwest to northeast, and there is a dry tongue from north to south in the central part. The drought center is in the northern part of central Guizhou, and the soil water deficit degree differs between the eastern and western sides of Liupan Mountain. The east is slightly better, with a difference of 2% in the same latitude. about. 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.
The results of the soil moisture tester show that the characteristics of the multi-year average vertical profiles in different climatic zones are: Poor soil water stability in severely dry areas of soil in northern central Hebei and northeastern Yunnan, with poor coefficient of variation, and severe water shortage in shallow layers. In the spring and late spring and early summer, the deep soil is also in a water-deficient state all year round; the seasonal water shortages in the middle and east Fujian Province are mainly water-deficient in May and June, and the deep soil moisture is relatively good in the eastern part of the Fujian Province. The central area is poor, but the area with low soil moisture is higher in the central area than in the eastern area. There is no obvious water shortage period in the suitable soil moisture area and humid area. The soil moisture in the soil layer above 30 cm is relatively stable, and is transported to the deep layer; soil moisture There are obvious seasonal changes in the relatively low value areas, and there are differences in the time and depth of each climate area.
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