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The Nature of China's Flora and the Relationships between Its Different Element

WANG He-Sheng (Institute of Geography, The Chinese Academy of Sciences, Beijing 100101)  
According to the flora balance theory and the research results from the project of“Chinese Seed Plants Flora”, Chinas floristic nature has been analysed in the paper. It is subtropical nature as the tropical elements being 50 2% and the temperate ones 49 8%, i.e. they are basically balance. However, there are obvious regional differentiation. The tropical elements reach 75%~85% in tropical regions, 40%~60% in subtropical, 15%~25% in temperate, and only 5%~25% in cold-temperate, high-cold and Central Asian desert. They become lower and lower gradually from south to north but the temperate elements are on the contrary. The relationships among different geographical elements are studied based on the coefficient of similarity between every two elements of families belonging to the 15 distribution patterns of Chinese seed plants genera. The coefficient of similarity is 12~58 and can be divided into 10 degrees from 10~60. The highest coefficient of similarity is 58 23 which means there is the closets relationship between East Asia and Chinese endemic elements, the lowest one is 12 77 between Tropical Asia and Temperate Asia. There are three concentration areas with higher and highest coefficient. They are East Asia, Ancient Mediterranea and Old World, which may probably be the cradles of Chinese flora.
【Fund】: 国家自然科学基金资助项目!(9390 0 10 )
【CateGory Index】: Q948.2
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