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The transpiration water consumption of Robinia pseudoacacia forest on the Yin and Yang slopes of the Loess Plateau Gully Area is 176.7 and 260.3 mm, respectively. It is easy to see that the plant's transpiration water consumption on the sunny slopes is relatively large, which is undoubtedly one of the main reasons for its low soil moisture content. Soil Moisture Meter Measurement Results From the 0-2 m soil moisture content at different slopes in April, the water content at the top of the beam was similar to that in the middle and upper part of the slope, between 13.% and 14.81%; the soil moisture content was slightly higher in the lower part of the slope. Beam top and slope, middle.
The soil moisture content of Dongpo and Pinus tabulaeformis in the lower part of the northwest slope was 0.95% and 1.46% higher than that in the upper part of the slope, respectively. The soil moisture meter found that the soil water content at different slopes in June was similar to that in April. The soil moisture content in Dongpo and the lower part of the northwest slope was 1.28% and 0.35% higher than that in the upper part of the slope, respectively. The soil moisture content of Hebei Yanglin and Robinia pseudoacacia forests were similar, while that of Caragana intermedia shrub land was poor. In October, the order of soil moisture content was Hebei poplar> Robinia pseudoacacia forest> Caragana intermedia.
Through the soil moisture meter, it was found that although the forest age, site orientation and sampling number of each forest species were not exactly the same, the impact of forest species on soil moisture was still evident. Forest soil moisture status is the result of a combination of climate, site conditions, and plant transpiration. In the same climate conditions and site types, the impact of forest types on soil moisture can not be ignored.
Analysis of Results of Different Slope Positions of Soil Moisture Analyzer
Under the conditions of forest stand, slope direction, slope, soil properties and precipitation, the determination of soil moisture meters at different slope positions shows some differences. The main reason is that the total amount of solar radiation received by different slope positions is different, resulting in the potential evaporation of soil and The effects on plant transpiration are different; different slope positions receive different runoff. Soil Moisture Analyzer measurements of soil moisture in 2m soil layers of shrubs and waste lands of different sea-levels showed that the soil moisture content of the shrubs on the shady slopes was significantly higher than that of the sunny slopes, and the average water content from April to September was greater than that of the sunny slopes. 2.35% higher.