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Slope orientation, slope, and slope position all have different effects on the slope-scale soil water distribution. Different plant species also have different effects on the vertical and horizontal distribution and time distribution of soil moisture. However, there are few studies on the variation of soil moisture in the western Loess Plateau. The relationship between soil moisture and site factors in the west of the Loess Plateau, especially the study of the water consumption patterns of different shrubs, is rare. This is a problem that needs to be solved urgently in the ecological restoration of the western Loess Plateau. Therefore, different moisture distributions were analyzed by the soil moisture tester for the determination of each sampling point.
Soil moisture is the main limiting factor for plant growth and vegetation restoration in the Loess Plateau. The spatial variability of soil moisture in the Loess Plateau is a key factor affecting the rational allocation of vegetation and effective use of soil moisture. Therefore, the distribution of soil water in artificial shrub lands in the western Loess Plateau was studied in order to select the most suitable afforestation tree species and determine appropriate afforestation techniques.
Using a combination of a soil moisture tester and a drying method (105°C), the instrument was calibrated to volumetric water content by standardization, and the mass water content measured by the drying method was multiplied by the soil bulk density (the ring weight method was used for the determination of bulk density). Also converted to volumetric moisture content. For the first time, the drying method was adopted, and each layer was repeatedly measured three times with a soil moisture meter and averaged. The sampling time was August when the plant growth was relatively stable.
Through the analysis of the soil moisture meter, it can be seen that within a certain range of slope, the main factor affecting the soil moisture content is the aspect. The sunlight intensity of sunny slopes and semi-sunny slopes is large, and the transpiration of plants and the evapotranspiration of soil moisture are large. The light intensity of shady slopes and shady slopes is weak, and the evapotranspiration and transpiration intensity of the soil are small. Therefore, the soil moisture content of the shady slope is the highest, followed by the shady slope and the semi-sunny slope, and the sun slope is the lowest.
In the semi-sunny slope with high evapotranspiration of soil moisture, the main shrubs are Caragana korshinskii, red sand, half-day flowers, Overlord, Ceratoides, Haloxylon ammodendron and so on. It can be seen from the measured values ​​of the soil moisture tester that, compared with other shrubs, Haloxylon ammodendron has the largest soil moisture reserves and Caragana is the lowest. This indicated that under strong light, the transpiration of Caragana korshinskii was enhanced and the water consumption of plants increased.
Soil moisture is the main limiting factor for plant growth and vegetation restoration in the Loess Plateau. The spatial variability of soil moisture in the Loess Plateau is a key factor affecting the rational allocation of vegetation and effective use of soil moisture. Therefore, the distribution of soil water in artificial shrub lands in the western Loess Plateau was studied in order to select the most suitable afforestation tree species and determine appropriate afforestation techniques.
Using a combination of a soil moisture tester and a drying method (105°C), the instrument was calibrated to volumetric water content by standardization, and the mass water content measured by the drying method was multiplied by the soil bulk density (the ring weight method was used for the determination of bulk density). Also converted to volumetric moisture content. For the first time, the drying method was adopted, and each layer was repeatedly measured three times with a soil moisture meter and averaged. The sampling time was August when the plant growth was relatively stable.
Through the analysis of the soil moisture meter, it can be seen that within a certain range of slope, the main factor affecting the soil moisture content is the aspect. The sunlight intensity of sunny slopes and semi-sunny slopes is large, and the transpiration of plants and the evapotranspiration of soil moisture are large. The light intensity of shady slopes and shady slopes is weak, and the evapotranspiration and transpiration intensity of the soil are small. Therefore, the soil moisture content of the shady slope is the highest, followed by the shady slope and the semi-sunny slope, and the sun slope is the lowest.
In the semi-sunny slope with high evapotranspiration of soil moisture, the main shrubs are Caragana korshinskii, red sand, half-day flowers, Overlord, Ceratoides, Haloxylon ammodendron and so on. It can be seen from the measured values ​​of the soil moisture tester that, compared with other shrubs, Haloxylon ammodendron has the largest soil moisture reserves and Caragana is the lowest. This indicated that under strong light, the transpiration of Caragana korshinskii was enhanced and the water consumption of plants increased.
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