1. The soil moisture content of different vegetation types has a similar pattern in vertical distribution.
In the initial stage of growth, the vertical level of soil moisture content can be roughly divided into three levels of change: 0-40 cm, 40 cm-100 cm, and 100 cm or less. The surface soil moisture is high, then decreases, and finally reaches a relatively stable state.
2. There is a significant difference in soil moisture content among different vegetation types.
At the initial stage of growth, herbaceous species had a much higher surface soil moisture content than that of the vegetation type with a water content above 6%, and the water content of the apricot shrubs was the lowest, only about 2%. In the deep soil layer (200cm), the soil moisture content was high or low. Regardless of the type of ground vegetation, the soil moisture content is mainly affected by the transpiration of the plant. The level of impact is directly reflected in the distribution of vegetation type roots; during vigorous growth to grassy stage, SOcm-100cm, in addition to Scots pine forest in arbor forest, Pinus tabulaeformis, mixed forest, and poplar groves have significantly higher moisture content in the higher ten bushes.
At the level of 100cm and below, the water content in the arbor woodlands tends to be the same with ten percent, which is the lowest and fluctuates at 4%. The performances of hilly, eucalyptus, sparse, and abandoned farmland are the same, dropping from high levels to 200cm and approaching 6%. At the end of growth, within 40cm, the soil moisture content of shrubbery is the lowest, followed by arbor forest, and the highest water content is grassland type. With the increase of depth, the water content of arbor woodland such as Pinus sylvestris var. Mongolica, Pinus tabulaeformis and Pinus sylvestris var. Gradually decreased to the lowest level, among which the water content of Scots pine forest is the lowest among all vegetation types, and this trend continues until 200cm, the highest moisture content in the wild grassland, and the middle ten status of the shrubbery.
3, changes in soil moisture at different times.
Whether in the early stage of growth, in the period of prosperous growth or in the end of growth, the content of surface soil moisture (above 40 cm) in the shrubbery was the lowest in several vegetation types, and the lowest in the deep soil moisture comparison. Grassland types are the highest at any time. Shrubs consume water from the topsoil, and arbors have an effect on deeper soil moisture. In semi-arid sandy land, the growth of shrubbery is more dependent on ten rains, while arborous forests rely on the dual effects of ten rains and high and low groundwater levels.
Related equipment: Soil moisture recorder Soil moisture meter
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