The study looked at how different types of grasslands in Hulunbeier are affected by plant species richness, biomass, and environmental factors. They found that meadows and steppes have more stable plant communities than desert steppes. Species richness increases with more aboveground biomass, but this relationship slows down as the area gets bigger. More rain and organic carbon mean more plant species, while higher temperatures mean fewer species. Water and temperature are the most important factors for plant diversity in these grasslands.