吉林省胡桃楸群落主要分布地区物种组成及区系分析

通过对吉林省胡桃楸群落主要分布地区调查数据的统计发现维管束植物共计58科137属186种.科、属、种数量均以延边地区最高,吉林地区次之,白山地区最少;物种组成的相似性以吉林-延边最高,延边-白山和吉林-白山相对较小;不同地区科、属组成均以单种科、单种属占优势,组成具有一定的分散性.各地区胡桃楸群落植物属的区系分布总体趋势比较一致,均以北温带分布为主,兼有部分热带分布类型,旧世界热带分布、东亚北美间断分布等也存在一定比例,说明该群落维管束植物的组成存在与热带早期的历史联系,具有较高的古老性和联系的广泛性;此外,作为胡桃楸群落区系的重要组成部分,世界分布类型反映了该群落是在漫长的地史年代中发展而来的次生性植被.吉林、延边、白山群落的T/R值分别为4.73,6.41,9.33,区系组成均表现出强烈的温带性质.

Species Composition and Main Floristic Distribution of Juglans mandshurica Community in Jilin Province

Based on the investigations for main distribution area of Juglans mandshurica community in Jilin Province,there were 58 families 137 genera 186 species of vascular plants,the amount of which was the largest in Yanbian,followed by Jilin and Baishan successively. The composition similarity was the highest in Jilin-Yanbian Area,there was relatively low in Yanbian-Baishan Area and Jilin-Baishan Area. The compositions of families and genera were mostly the families as of only one species well as the genera of only one species in all areas,and the species compositions were dispersal. The total distribution of Juglans mandshurica community was almost same in different areas,with the north temperate primarily,besides tropics,the old world tropics,and East Asia & North America accounted for a proportion,which suggested the compositions of vascular plants,ancient and relatively comprehensive,had a early relation with the tropics history. In addition, cosmopolitan was a significant part of Juglans mandshurica community floristic, it was the secondary vegetation in the long history. T/R of the community in Jilin, Yanbian and Baishan was 4. 73,6. 41,9. 33 respectively, with strongly temperate floristic compositions.