赣江河岸带种子植物区系特征

FLORISTIC CHARACTERISTICS OF SEED PLANT IN RIPARIAN OF GAN RIVER

通过对赣江河岸带种子植物的调查和区系地理成分的分析,结果显示,赣江河岸带种子植物物种组成丰富,区系组成复杂,共有种子植物119科405属708种,其中裸子植物2科2属2种,被子植物117科403属706种。被子植物中,双子叶植物99科312属548种,单子叶植物18科91属158种。其生活型组成以草本植物为主,占河岸带种子植物总种数的62.01%,而木本植物中落叶成分占到71.67%,体现了河岸带特殊的生境特点。赣江河岸带种子植物区系组成中,世界广布科、属具有优势,分别占总科、属的39.50%、15.31%,使河岸带植被具有隐域性的特点,属的分布区类型复杂,TTrop/TTemp值为1.02,体现了其植物区系地带性过渡特征。运用聚类分析、公式拟合和主成分分析几种方法研究赣江河岸带与几个区系的关系,结果表明,赣江河岸带处于典型湿地与典型山地之间,区系组成具有水陆交汇性特点。

708species of seed plants affiliated to 405genera in 119families were discovered in riparian of Gan River based on field survey and analysis of geographical elements.There were 2gymnosperm species belonging to 2genera in 2families and 406angiosperm species belonging to 403genera in 117families. Among angiosperm,there were 548dicotyledonous species belonging to 312genera in 99families,and 158 monocotyledonous species belong to 91genera in 18families.According to life-form classification of plants group,herbs（62.01%）were the dominants and deciduous component（71.67%）in woody plant,which reflected the characteristics of ecological environment in Gan River riparian.Further flora analysis indicated that there were intrazonal feature of vegetation in this distinct being of prevailing widespread families （39.50%）and genera（15.31%）,and complex distribution types of plant genera.TTrop/TTempvalue was 1.02,which embodied a transitional flora trait.Cluster analysis,principal component analysis and formula fitting implied the intersection of land and water.