The quantities of modulus of Artemisia frigida populations were sampled in the series of grazing gradient with no grazing (having been protected for twenty years by pen), mild grazing , moderate grazing , and heavy grazing in a Leymus chinensis grassland near the Inner Mongolia Grassland Ecosystem Research Station. The results are as follows: along this gradient, Artemisia frigida individuals hada significant difference in quantities of vegetative tillers , quantities of adventitio...