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A primary analysis of the flora on Liupan Mountains:its nature and characteristics

DAI Jun-hu~(1),BAI Jie~(1,2),SHAO Li-yang~(1,2),HAN Chao~(1,2),CUI Hai-ting~(3)(1.Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China;2.Graduate School of the Chinese Acadamy of Sciences,Beijing 100039,China;3.College of Environmental Sciences,Peking University,Beijing 100871,China)  
The Liupan Mountains are situated in the intersection of Ningxia Hui Autonomous Region,Shaanxi,and Gansu provinces,between 35°-36°10′N and 105°4′-106°30′E.The region is not only the transitional zone between semi-humid and sub-arid climate,but also has rich biodiversity on the Loess Plateau,even in Northwest China,with regional vegetation distributing from warm temperate deciduous board-leaved forest zone,forest-grassland zone to desert-grassland zone.Studies on the plants' floras of Liupan Mountains show that it comprises 836 species of vascular plant,belonging to 93 families and 359 genera.Its floras can be attributed to the following categories:Loess Plateau subregion,North China region,Sino-Japan forest subkingdom,and Holarctic kingdom.There are 13 distribution types and 12 subtypes of genera of seed plants,of which North temperate elements play an important role in the flora.The plant genera flora on Liupan Mountains connect closely with other floras but have little endemic genera.The floristic affinities of the study area with neighboring three mountains(Taibai,Xiaolong and Zhongtiao mountains) are close,and their coefficients of plant genera flora all exceed 60%,indicating that these mountains have similar bio-climatic conditions without any clear vicariance.While the coefficient with Helan Mountains is under 60%,because the Helan Mountains are located in arid desert and semi-desert region and it is supposed that there is intense vicariance in nature in the development of the Yellow River in Ningxia and Gansu.
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