Abstract: Based on field investigation and experimental data, the variation pattern of grassland biomass and its relationships with environmental factors in Hulunbeier of Inner Mongolia were studied. The results indicated that there existed a significant difference in the biomass of plant communities along an environmental gradient. The variation of the biomass had no significant correlation with precipitation and air temperature, but positively correlated with soil organic carbon content in 0—20 cm layer and negatively correlated with soil bulk density. According to multiple regression, the main factor restricted the biomass was soil organic carbon. The utilization patterns of grassland in study area possibly made the soil nutritive condition become the limiting factor on the growth of grassland vegetations, which in turn affected grassland biomass.

Key words: Ginger, Soil water, Light intensity, Morphologic characteristics, Yield