Influence of topographic factors on soil moisture temperature

Influence of topographic factors on soil moisture temperature

In a piece of farmland, topographic factors have a great influence on soil moisture, and unavoidably affect the soil moisture temperature. Topographic factors include the slope direction, slope, etc. of farmland, and soil moisture temperature can be measured and recorded using soil. Moisture temperature recorder to complete, soil moisture temperature recorder to achieve moisture temperature measurement, recording, preservation, export function.

According to the principal component analysis, the slope orientation is the main component in the 0-30cm soil layer, followed by the elevation impact and the slope gradient. In the 30-60cm soil layer, the slope gradient is the dominant component, followed by the elevation impact degree, and the slope direction. The smallest. The slope direction is the main component factor that affects the soil moisture temperature from 0 to 30cm. The reason is that the surface soil moisture temperature is affected most by the meteorological factors, especially the solar radiation intensity. The difference in slope direction can reflect solar radiation to the greatest degree. The difference in intensity, in turn, reflects the difference in soil moisture content. In the 30-60cm soil layer, the effect of the meteorological factors weakens as the soil depth increases, so the influence of the slope direction decreases; and the slope becomes the main component factor affecting the soil moisture status, and the difference in slope causes moisture. The flow and conservation of temperature in the soil is the main reason for the difference in temperature of soil moisture at the deep level.

Using the attribute database of slope direction, slope and corresponding soil moisture temperature conditions, establish a relationship model between soil moisture temperature content and aspect, slope.

In the same gradient range, the influence of slope is considered as uniform, and the relationship between soil and slope direction is analyzed and studied, and the relationship between them is described by a curve. The curve parameter estimation method (CurveEstimation) module can automatically fit 11 kinds of curves. The output curve models give the correlation index R2 value and significant level p value, and can combine the curve equation and the variable to get correlation index R2, standard error. F value and p value, according to the need to select an expression.

Topographic factors have an important influence on the temperature of shallow soil moisture, with the slope direction affecting the trend from northeast to southwest. The principal component analysis of the topographic factor and soil moisture temperature attribute database showed that the slope direction is the main component in the 0-30cm soil layer, followed by the elevation and the least slope. In the 30-60cm soil layer, the slope is the main component. The impact of elevation is followed by the least extent.

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