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。
Long - term heavy grazing simplified the alpine shrub community and decreased the standing above - ground biomass, especially palatable herbage plants.
不论是低地草甸、山地草甸，还是高寒草甸，其植物群落发生的基本因素是充足的水分条件。
Whether it is low ground, mountainous or alpine meadow, the basic factor of their vegetation formation is water condition.
同时计算表明，海北高寒草甸地区植物群落对PAR的光能利用率为0 .5 8%左右。
The efficiency of energy conversion of PAR is 0.58% more or less in plant community of Haibei alpine meadow area.
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