灌木的扩张也发生在其他环境中，比如半干旱草原和高草草原。
Shrub expansion has occurred in other environments, like semiarid grassland, and tall grass prairies.
一只北美野牛伫立在俄克拉荷马州的高草草原保护区。
An American bison stands in a field on the Tallgrass Prairie Preserve in Oklahoma.
结果表明，羊草草原年降水以及月降水的年际波动明显；
Our results showed significant differences in annual and seasonal precipitation patterns.
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