Water is a key natural factor that restricts the construction of vegetation on the Loess Plateau. The Loess Plateau is rich in soil, the groundwater is buried deep, and the plants are difficult to use. The required water mainly comes from soil moisture. Soil moisture has been affected by water balance, water circulation and soil resources. Widespread concern. One of the measuring objects of the portable soil moisture temperature rapid measurement instrument (soil moisture) is generally defined as the moisture in the unsaturated zone of the soil, which is the influence of climate, soil and vegetation on the water circulation process, and the dynamics of the moisture cycle on the vegetation pattern. The key factor that affects the synthesis. Soil moisture determines the type and structure of vegetation in ecological construction and is the main influencing factor for plant growth, vegetation restoration, and soil erosion.
The portable soil moisture temperature rapid measurement instrument research shows that autumn and winter are slow accumulation of soil moisture, late spring and early summer is the stage of strong soil water consumption and summer is the stage of soil moisture fluctuation; 0~5cm soil moisture content is sensitive to precipitation, With the occurrence of precipitation, the soil moisture content rose rapidly; with the increase of depth, the increase of soil moisture content gradually decreased, and the lag time gradually extended, but at the depth of 40cm, the soil moisture content was basically not affected by precipitation. influence.
Precipitation has a strong influence on soil moisture dynamics and is the main source of soil moisture and crop growth water demand in the area. The change of soil moisture is closely related to the change of rainfall. The research on the correlation between precipitation and soil moisture on the Loess Plateau mainly focuses on two aspects. First, the effect of precipitation on the dynamic changes of soil moisture in seasonal and different precipitation types and the response of soil moisture to rainfall at different depths.
At present, the portable soil moisture temperature velocity measuring instrument has studied the interaction between vegetation and soil moisture in the Loess Plateau to some extent, and achieved some results. The study of soil moisture in the Loess Plateau mainly focuses on the three scales of large, medium and small scales. The important factors for research in a small area affect soil moisture conditions including texture, bulk density, and soil moisture constant (field capacity, withered, saturated). Water volume and soil infiltration rate, etc.) and the relationship between plant growth and soil moisture. On the mesoscale, the main research direction is the impact of land use structure and type/land cover change on soil moisture. On a large scale, the influence of soil water cycle on the land-water cycle in the Loess Plateau, the regional differentiation of soil moisture, and the relationship between environmental drought and soil moisture in the Loess Plateau were studied.
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