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。
Some of the species are flooded and vanished during the flood season. Only some tall grasses survive with high tolerance of submergence. The dominant species belong to Gramineae and Cyperaceae.
而高水位时，部分物种淹没死亡，余下以禾本科和沙草科植物为优势种草本植物群落。
Some of the species are flooded and vanished during the flood season. Only some tall grasses survive with high tolerance of submergence. The dominant species belong to Gramineae and Cyperaceae.
而高水位时，部分物种淹没死亡，余下以禾本科和沙草科植物为优势种草本植物群落。
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