Influence of different moisture factors on forage yield of inner Mongolian typical steppe

The paper analyzed the relations of precipitation, soil moisture, water consumption and forage yield at different time, and established the corresponding empirical equation by using biomass, soil moisture of natural grasslands and meteorological data of nearly 15 years in 3 stations of Inner Mongolian typical steppe area. The result indicated that correlation of various moisture factor with the yield was soil moisture water consumption precipitation; Influence of moisture on the yield had the tendency of small in earlier growth period and larger in middle and later period, indicating that the relativity increased with the growth of forage, moisture content had accumulative effect on forage yield. In ordinary circumstances, the moisture content of forage yield has been basically provided by 050 cm soil layers. The relations of soil moisture, water consumption and forage yield could be modeled by linear or exponential equation; The relationship between precipitation and forage yield be modeled by seconddegree curve. The conclusions and equations could provide reference to forage yield monitoring, drought evaluation and analyzing.