The study looked at changes in grassland in Hulunbuir Grassland, China from 1989 to 2010 using satellite data. They found that the grassland area decreased over time, with medium vegetation coverage being the most common type. The grassland types shifted from medium coverage to low and high coverage. Wetland, forest, and cultivated land frequently changed between grassland and other types. The rate of grassland changes slowed down from 1989 to 2010, and the overall pattern of grassland changes became more stable.