Shrub expansion has occurred in other environments, like semiarid grassland, and tall grass prairies.
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。
2
The raising of livestock is a major economic activity in semiarid lands, where grasses are generally the dominant type of natural vegetation.
在半干旱地区，草地通常是最主要的天然植被，而该地区主要的经济活动是家畜饲养。
3
In arid and semiarid regions, on the other hand, the small number of lakes and the great distances between them reduce the possibilities for correlation.