When they sense the sheep grazing, they pop their ugly heads out of the ground and bite the sheep on the nose.
当它们闻到了羊的气味，就会从洞里探出它们那丑陋的头，在羊的鼻子上咬一口。
Long - term heavy grazing simplified the alpine shrub community and decreased the standing above - ground biomass, especially palatable herbage plants.
长期重度放牧使高寒灌丛群落结构简化，地上现存生物量特别是优良牧草的现存量减少。
Grazing not only directly affects above ground part of grass communities and grassland soil, also indirectly influences underground productivity and material turnover.
放牧作为一种干扰因子，通过对群落地上部分和土壤的影响，导致地下部分的生产力和物质周转率的变化。
The results are as follows:1)With increased time of free grazing, the ground cover of the grassland and the production ability gradually descend, the plant species gradually reduces.
结果表明：1）随自由放牧时间的延长，草场植被盖度、生产力逐渐下降，植物种类逐渐减少；
The results are as follows:1)With increased time of free grazing, the ground cover of the grassland and the production ability gradually descend, the plant species gradually reduces.
结果表明：1）随自由放牧时间的延长，草场植被盖度、生产力逐渐下降，植物种类逐渐减少；
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