Grassland is a land cover class that includes any geographic area dominated by natural herbaceous plants (grasslands, prairies, steppes and savannahs) with a cover of 10 percent or more, irrespective of different human and/or animal activities e.g. grazing, selective fire management. 

Source:

“Status of the World's Soil Resources. Main Report |Policy Support and Governance| Food and Agriculture Organization of the United Nations .” Food and Agriculture Organization of the United Nations (FAO) and Intergovernmental Technical Panel on Soils (ITPS), 2015.