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通过降水与土壤水分、土壤水分与天然草场产草量之间建立的统计关系，说明土壤水分供应是影响牧草产量的重要因素，并依据土壤水分与牧草产草量的关系划分出土壤水分供给的正常、干旱等指标。
Through the statistical relationship between precipitation and soil moisture, soil moisture and grassland production, it shows that the supply of soil moisture is an important factor affecting the yield of forage grass. According to the relationship between soil moisture and forage yield, the soil water supply Normal, drought and other indicators.