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The distribution pattern and ecological adaptation of Caragana microphylla,C. davazamcii and C.korshinskii

ZHAO Yi-Zhi (Faculty of Life Science,Inner Mongolia University,Hohhot 010021,China).  
The distribution pattern of Caragana microphylla,C.davazamcii and C.korshinskii was revealed.C.micraphylla is a distribution species of the eastern Mongolia Plateau-the western Songliao Plain-the mountain of North China,C.davazamcii is a distribution species of the eastern Gobi-the Ordos Plateau-the northern Loess Plateau,C.korshinskii is a distribution species of the southern Alashan-the western Ordos.C.microphylla distributes over the typical steppe zone and the forest stepe zone of Mongolia Plateau and mountainous deciduous broad-leaved forest zone of the North China.On the high plain of steppe zone,C.microphylla may forms the shrub steppe landscape,on the sand land of steppe zone it is a dominant species of shrub vegetation.C.davazamcii distributes over the steppe desert zone and the desert steppe zone,the sand land and hill of the Ordos Plateau,and Loess hill of the northern Loess Plateau.C.davzancii is also a dominant species of shrub vegetation.C.korshinskii distributes over the fixed and semi-fixed dune of the steppe desert and the typical desert zone.The zonal distribution of above 3 kindred plants of Caragana forms a obviously geographic substituted distribution from east to west or from north to south.
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