The total N in tiller under grazing was higher than that of ungrazing (P0.05).The total N content in tiller was negatively interrelated with that of biomass.

• 分蘖节的含氮量与生物量呈负相关，放牧处理下月平均含氮量显著高于对照区(P0.；05)，而放牧区重度放牧的含氮量显著大于中牧区。