Soil moisture is an important feature in soil systems and an important part of soil physics research. The soil moisture meter can quickly and accurately measure and monitor soil moisture changes, and soil moisture is also an important carrier of soil nutrient circulation and flow. Changes in soil moisture affect soil characteristics and crop growth, and indirectly affect plant distribution and affect microclimate changes to some extent.
Over the years, many scholars have conducted deep researches on the dynamic distribution of soil moisture in different regions, but there have been few studies on the dynamic changes of soil moisture in the natural grassland of the Tibetan Plateau. In this paper, soil moisture measurement data from 1999 to 2006 in Feixi County were used to analyze the temporal variation and vertical variation characteristics of soil moisture in this area, in order to understand the intrinsic relationship between soil moisture and pasture growth in Sanjiangyuan Region, and to predict The degree of early occurrence provides a scientific basis for the comprehensive prevention and control of dry disasters and the sustainable use of water resources.
1. The annual change of soil water storage fluctuates oscillatingly, showing multiple fluctuations, and its change is basically consistent with the annual precipitation; the soil water storage during the year has obvious time change, monthly soil water content change curve is basically /M0 type distribution, soil water storage capacity In April and May, the troughs were divided into five stages, namely, the slow growth period in spring, rapid increase in spring and summer, rapid loss in midsummer, rapid increase in autumn, and rapid loss in late autumn.
2. The vertical change of the average soil water storage is obvious. The water content in the 20-30cm layer is the largest; 0-20Cm is the multi-variable layer, and it is in direct contact with the atmosphere. It is influenced by the weather, pasture growth and human activities and other factors, and receives rainwater. Strong ability, active exchange of water up and down, rapid increase in enthalpy and loss, obvious changes in dry and wet; 20 to 50cm is a gradual change.
The seasonal variation of vertical profile of soil moisture can be divided into three stages according to the coefficient of variation. The coefficient of variation of the water storage coefficient in the rainy season is larger than that in the dry season, indicating that the change in soil moisture during the rainy season is more complex than that in the dry season.
The research conclusions are of great significance in revealing the characteristics of soil water changes in Xinghai area, establishing soil moisture model and dry early forecasting equations in specific areas, and analyzing the internal relationship between soil moisture and forage grass growth and development. However, the limitation is that only the general laws under specific geographical backgrounds are analyzed. If we want to study the laws of soil moisture under different slopes and vegetation coverage, we need to set up different experimental treatments for special studies in future work.
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