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Ecological Geographic Distributions Specificity of Flora of Oxytropis in NeiMongol

Zhao Yizhi Liu Li (Department of Biology,NeiMongol University,010021,Hohhot,PRC)  
It is believed that the mordern distribution center of Oxytropis is in Central Asian the belt of Tianshan、Paimirs Alai、Baerhasitai and Altai,and its secondary center is in Mongolia plateau.In China,the species of this genus distributes mainly in Xingjiang,secondarily in Tibet,third in NeiMonggol.The plants of Oxytropis mainly distribute in steppe region in NeiMonggol,the xeric plants dominate absolutely among them (accounted for about 71.4%),many species are characteristic plants with ecological indicating sigification for the index species of steppe.The plants of this genus distribute a little in forest region and hardly in extreme desert.In NeiMongol,the central Asia elements are the majority of the florisitc geographic elements of Oxytropis plants,making up 64.3%.The Qingzang plateau elements seep into the alpine plant in the southwest of NeiMongol,holding 14.3%,and the East Asia elements seep into the east and the southern region,holding 7.2%.Among these species,there are seven endemic species in NeiMongol,two Yinshan endemic species,four Wulanchabu endemic species,one Ordos endemic species.All of these show clearly that the xeric steppe flora is the majority of the plants of Oxytropis in NeiMonggol,the mesic forest flora of East Asia and the high altitude and cold elements of Qingzang plateau relatively has very little influence upon them.The plants of Oxytropis in NeiMonggol have some connection with its adjacent regions,Relatively speaking,they have more close connections with North China and Northeast China than with Central siberia and Mongolia,and the connection with Xingjang and Tibet is very little.The key to the plants of Oxytropis in NeiMongol has been recomposed,and the distribution maps have been drawn for every species.
【Fund】: 国家自然科学基金
【CateGory Index】: Q949
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