The growth of natural pastures, degradation of grassland, and desertification of land are all affected by soil moisture, and this influence is significant. With these decades of production and development, the climate has changed. This change has led to aggravation of the aridity of pastoral areas in the grasslands and has caused widespread concern. Soil moisture content is an important index to measure the degree of drought. Therefore, the analysis of the relationship between soil moisture changes and climate has a very important role in grassland ecosystems and grassland water balance, improve drought prediction model and rational use of grassland.
The Xilin Gol League Animal Husbandry Meteorological Station and the Chayouhou Banner meteorological station were selected as representative stations in the typical grassland area, and the seasonal variation of soil moisture was analyzed using the meteorological data from 1982 to 2002 and the ten-day soil moisture observation data. Vertical change characteristics of water content in Xilinhot O}l00em soil layer). The average soil moisture status from 1982 to 1989, 1990 to 1999, and 2000 to 2002 represents the water conditions of the 1980s, 1990s, and early 2000s, respectively. Using the Penman-Monteith method [to calculate potential evaporation, using mathematical statistics method to analyze the climatic factors affecting soil moisture changes.
The extent of soil moisture is largely constrained by climate and environmental changes, and climate and environmental conditions change with different years. The determination of soil by soil moisture analyzer reflects the interannual variation of soil moisture in the growing season to a certain extent. The interannual trends of soil moisture at the two sites were similar. The percentages of soil water anomalies in the early 1980s and the mid-1990s were mostly positive. The percentages of the anomalies in the mid-late 1980s and early 2000s were negative, indicating soil Water began to decrease from the early 1980s, and Chayouhou Banner and Xilinhaote fell to their troughs in 1988 and 1990 respectively; afterwards, the water content increased gradually, and the increase of the Chayouhou Banner was significantly greater than that of Xilinhot, and the peak occurrence time differed by 3 years; 20 In the late 1990s and early 2000s, the soil moisture rapidly decreased and reached the lowest value, and the soil drought was very serious.
After measuring and analyzing the water content of grassland soil by the soil moisture analyzer, it can be found that the important factor that determines the regional ecological environment quality is soil water resources, and the soil moisture in different areas needs to be maintained at a certain level, otherwise the ecosystem will It will be destroyed and the land will be desertified. Only the temporal and spatial changes of soil moisture and its influencing factors have been analyzed. For the relationship between soil moisture and the growth of the community, the supply and demand of grassland ecosystems and water balance will be the main topics for future research.
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