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As the soil of the temporal and spatial variation continuum, its characteristics have obvious differences in different spatial positions, which is the so-called spatial variability of the soil. In traditional soil surveys, it is not actually a quantitative estimate. In many cases, it is difficult to accurately describe the spatial distribution of soil properties (such as soil moisture content). When studying a certain soil characteristic, first understand the background status of the study area. It is very necessary and is the basis for further research. Therefore, in the long-term determination of soil water content, it is necessary to first understand the spatial distribution of water content in the study area, so that the selected measurement points are both representative and labor-saving. The soil moisture tester has the advantage of accurately determining the moisture content in the soil.
Before July, the soil moisture content was low, but the spatial variability of soil moisture was high, so the base station value was also high. This is because the spatial pattern of soil moisture is controlled by the terrain and the effect of less rainfall is less. In July, with the arrival of the rainy season, although the influence of the aspect factor on soil moisture still exists, its effect is weakening. Due to the large amount of rainfall, the control of soil moisture is strengthened. The soil moisture content increased, the slope soil moisture was relatively uniform, and the base station value decreased. In August, the spatial variability of soil moisture gradually increased. Under extreme drought conditions, the soil water content is close to the wilting coefficient, the soil water pattern is controlled by itself, the effective moisture of the soil evaporates quickly into the atmosphere, and the soil moisture within the entire slope is relatively uniform. Therefore, the degree of soil variability is reduced.
After measuring the relevant data by the soil moisture tester, it was found that the degree of spatial variability of soil moisture on the slope was inversely proportional to the soil moisture content. When the soil moisture content was low, the spatial variability of soil moisture was high and the abutment value was high. With the increase of soil water content, the degree of spatial variability of soil moisture decreases, and the value of the abutment also becomes smaller. The nugget value shows a significant seasonal pattern, which is similar to the average soil moisture content. The soil water base level increases with the soil depth, ie, the soil layer is deepened, and the soil water variability increases.
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