But in experimental areas protected from fire, a few perennial grass species eventually come to dominate, outcompeting all others.
但在受火灾保护的实验区，一些多年生草本植物最终占据了主导地位，超过了其他所有植物。
The comparative test of twenty one species of perennial grass introduced into alpine cold pasture showed that in herbage yield and winter hardiness.
青藏高原高寒地区，多年生禾草混播草地是提高草地生产力、维护草地生态平衡的集约化牧业用地的最佳选择。
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