紫花苜蓿是多年生豆科牧草作物，在黄土高原半湿润区大面积栽培。

Alfalfa (Medicago sativa L.) is a perennial legume grass which was cultivated widely on semi-humid areas of the loess plateau.

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苜蓿具有强烈的耗水性能，导致半湿润区苜蓿草地发生干燥化，草地退化较为严重。

Due to its strong consumption of soil water, soil desiccation and grassland degradation happened quite frequently at this zone.

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属亚热带季风湿润气候区。

A subtropical humid monsoon climate zone.

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