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。

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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。

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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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Amid the peaks, we do a flyby of an impossibly tiny landing platform, grazing the ground to blow off some powder, then circling back and setting down.

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At various times the ground, once just a meadow kept in trim by grazing sheep, has been used as a venue for pigeon flying, hopping races and even an exhibition of archery by a tribe of Red Indians.

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