摘要
根据植物区系平衡理论 ,以“中国种子植物区系研究”项目的结果材料分析中国植物区系的性质和各成分间的关系。从全国整体来看 ,中国植物区系是亚热带性质 ,热带成分和温带成分分别占 50 2 %和 4 9 8% ,即基本平衡。而各地区间有显著差异 ,文中做了具体比较分析及揭示其变化规律 ,大致是热带成分在热带地区占 75%～ 85% ,亚热带地区占 4 0 %～6 0 % ,温带地区占 15%～ 2 5% ,寒温 ,高寒和中亚荒漠地区占 5%～ 10 % ,自南向北向西方向递减 ,温带成分与之相反 ,而且北方温带成分变化曲线与热带成分呈反射状 ,表明二者是以相反方向同等发展的。文中又据中国种子属 15个分布型或地理成分所归科的相似性系数矩阵来研究各成分间的关系 ,结果是相似性系数为 12～ 58强 ,分为 10级 (10～ 6 0 ) ,排列出各成分间相似性程度及其变化梯度 ,其中以东亚和中国特有成分间关系最密切 ,温带亚洲和热带亚洲间关系最疏远 ,同时显出 3个关系很密及最密区域 ,即旧大陆热带 ,古地中海和东亚 ,这三区域里可能是中国植物区系的发源地。
According to the flora balance theory and the research results from the project of“Chinese Seed Plants Flora”, Chinas 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.
出处
《云南植物研究》
CSCD
2000年第2期119-126,共8页
Acta Botanica Yunnanica
基金
国家自然科学基金资助项目!(9390 0 10 )
关键词
植物区系
地理成分
相似性系数
中国
Flora
Distribution patterns or geographical elements
Coefficient of similarity
China
