Abstract: The effects of deferred spring grazing and continuous grazing on the vegetation characteristics of the natural pasture were studied during the ungraing persod of spring of 2002. The result shows that both the plant yield and coverage, and the plant height and density of the deferred spring grazing pasture far surpassed those of the continuous grazing pasture (P<0.05). Deferred spring grazing contributes to the sustainable development of the pasture vegetation. Duration of ungrazing period in the spring affects the flourishing of the pasture vegetation, though not very vigorously.

Key words: Deferred spring grazing, Vegetation characteristics of the pasture, Continous grazing

摘要： 2002年春季进行禁牧与自由放牧的对比研究。结果表明,春季禁牧对草原植被的群落特征具有十分显著的影响;在禁牧区,植被产草量、盖度、高度和密度等与自由放牧区之间差异显著(P<0.05)。春季禁牧有利于草原植被的可持续利用。同时,禁牧期的长短对草原植被也有一定的影响,但是不显著。

关键词: 春季禁牧, 群落特征, 自由放牧