摘要
根据系统分类和地理分布资料 ,采用模糊聚类方法 ,将甘肃省所产忍冬属 41个类群划分为 1 8个地理范畴各异的分布式样 ,分别归属于中国特有、东亚、中国 -日本、中国 -喜马拉雅、热带亚洲、西亚喜马拉雅至东亚北部等 6个分布型 ,其中 ,中国特有分布类群占 73.2 %。多数分布式样体现出西南至东北部的适应性辐射方向 ,少数呈现西南至西北方向。将甘肃省忍冬属植物分布区划分为 3个区 ,1 1个小区 ,其中白龙江中上游山地、小陇山徽成盆地及南秦岭山地等 3个小区为该属植物在甘肃省的分布密集中心和多样化中心。横断山北部至秦岭西段山地是诸多国产忍冬属种系向北方适应性辐射和分化的结点。种系的迁入和分化以及该属植物的扩散途径是甘肃省忍冬属植物区系发生和区域分异格局形成的主要原因 ,西南山地成分是主要来源 ,并受制于生态地理因素和森林植被次生片段化过程。
Based on the materials of systematic classification and geographical distribution,using fuzzy cluster analysis method,the total 41 taxa of Lonicera in Gansu province were classified into 18 distribution patterns with different geographical range and belonged to 6 areal types:Endemic to China,Eastern Asia,China-Japan,China-Himalaya,Tropical Asia,Western Asia-Himalaya-north of Eastern Asia,respectively.73.2% of the total 41 taxa were made up of Endemic to China.Majority of these distribution pattern presented a adaptive radiation direction from southwest China towards the northeast,and the minority presented a direction from the southwest towards the northwest.The distribution range of the genus in Gansu were divided into 3 regions and 11 subregions,among which the 3 subregions:the mountainous area in the middle-upper reaches of Bailong river,Xiaolong mountains to the Hui-Cheng basin,and the mountainous area in southern Qinling seem to be the centre of the distribution density and species diversity of Lonicera in Gansu province.The mountainous areas from the north of Hengduan mountain to the west of Qinling mountain appear to be the knot of adaptive radiation northwards and differentiation of many species series of Lonicera native to China.The principal reasons of the floristic development and its areal division of the genus in Gansu may be summed up in the migration and differentiation of the species,mainly originated from the floral elements in the mountainous area of southwestern China,and dispersal routes of the genus,as well as being affected by ecogeographical factors and the secondary fragmentation of forest vegetation.
出处
《西北植物学报》
CAS
CSCD
2000年第2期250-258,共9页
Acta Botanica Boreali-Occidentalia Sinica
基金
甘肃林业科学技术研究项目!( 95-1 85)
关键词
忍冬属
模糊聚类
甘肃
植物区系
地理分布
Lonicera
adaptive radiation
distribution pattern
floristic division
fuzzy cluster
Gansu province
