关键词: 温带草原, 农垦旱作, 沙漠化尘源, 北半球

Abstract: The three large fertility steppes in North Hemisphere are situated in the western part of Northeast China and the central eastern part of Mongolia, northern Kazakhstan, and the great plain in central western America. There are 300~400 mm annual precipitation and flat landforms, which favor for the animal husbandry. Some references about the large scale reclamation for dry farming and the resulting desertification and sand sources have been collected and showed in the paper based on investigation data and documents.

Key words: steppe in temperate zone, reclamation for dry farming, desertification and sand source, North Hemisphere