Different plantation ages have different intensity of soil water use, and most of the relevant experiments are based on soil moisture recorder observation of typical artificial vegetation in different growth years. The main conclusions of the study are that with the increase of forest age, the influence of vegetation on soil moisture gradually increases, the soil water content and water storage in each soil layer decrease more, and the soil moisture recorder shows a significant numerical trend. Studies have shown that with the increase of the growth period of the Robinia pseudoacacia, Caragana korshinskii forest land, and seabuckthorn forest land, the soil moisture decreases year by year, and ten layers of soil are formed and thickened year by year.
Under certain conditions of natural precipitation, plant population density affects the normal growth of forest trees by affecting soil moisture content. Excessive afforestation density is an important factor that causes soil water deficit, vegetation ecological benefits and economic benefits to be difficult to play. Recently, research on the relationship between soil moisture and vegetation density has focused on the study of soil moisture characteristics under different vegetation densities. The relevant research of the soil moisture recorder shows that, under the same conditions, the water consumption of dense forests is relatively large, and the characteristics of forest soil soil moisture capacity change with the stand density is obvious. The soil water content of Robinia pseudoacacia forestland first rose and then decreased with the decrease of stand density. The soil moisture of medium density forestland could adjust the relationship between forest growth and soil moisture by adjusting the forest density.
Slope orientation, slope, and slope position are important influencing factors for soil moisture distribution, which in turn affects the survival rate of planted artificial vegetation. The determination results by soil moisture recorder showed that the average soil water content in 0~5m soil layer was 6.96% for sunslope, 7.62% for semi-sunny slope, 8.06% for semi-shade slope, and 8.87% for shady slope, respectively, in different stand sites. The mean value of soil moisture was in the order of sunny slope<semi-sunny slope<semi-shady slope<vegetable slope; there was a significant difference in soil water content of different slope-direction black locust woodlands; negative correlation between slope and soil water content, soil moisture of different slopes of black locust woodland in spring The differences in the contents were significant, and there was no significant difference in soil water content in different slopes of Robinia pseudoacacia forest in autumn.
The area with dense root distribution is often the area with the most active water use. The depth of root distribution affects the size of the plant's own nutrient space and the use of soil moisture and nutrients, which is a key factor that restricts the production level of vegetation. A few days ago, research on plant root systems and soil moisture recorders mainly focused on the mechanism of water absorption in plant roots and water uptake model in roots. The former focused on plant physiology, while the latter focused on establishing mathematical models.
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