But either heavy grazing or no grazing at all resulted in more females than males.
但是重度放牧或完全无放牧地区都导致了雌鸟比雄鸟更多。
Trees are sparse on grasslands due to seasonal floods and droughts, heavy grazing, and fires。
由于季节性旱涝，过度放牧和火灾，这里树木稀少。
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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