广西湿地水生维管束植物区系研究

Flora Studies on Aquatic Vascular Plants in Wetland of Guangxi Province

摘要:

初步得出广西地区湿地水生维管束植物共有63科163属412种，其中蕨类植物6科6属13种，种子植物57科157属399种。按植物形态特征和生态习性划分，广西湿地水生维管束植物可分为湿生植物、挺水植物、浮叶植物、漂浮植物、沉水植物5种类型。分析表明: 该区水生维管植物区系的地理成分复杂，联系广泛。热带性质的属有93属，占总属数的78.15%，温带性质的属有25属，占总属数的21.01%；热带性质的种有180种，占总种数的53.73%，温带性质的种有101种，占总种数的30.15%，表明该地区植物区系具有明显的热带性质，这与广西所处的气候带相一致。世界分布属有44属，世界分布种有77种，分别占总属数和总种数的26.99%和18.69%，它们是湿地植被的主要组成成份或关键属(种)。特有属种匮乏。此外，还对区系中受危种和外来种进行了讨论。

Abstract:

There are 412 species of aquatic vascular plants belonging to 163 genera in 63 families, including pteridophytes (13 species, 6 genera and 6 families) and spermatophytes (399 species, 57 families and 157 genera) in wetland of Guangxi Province. All these species can be divided into 5 types (i.e. hygrophyte, hyperhydate, ephydate, pleustophyte, hyphydate) according to the morphological forms and ecological forms. The floristic elements of aquatic vascular plants in wetland of Guangxi are very complex. At the generic level, ninty-three tropical genera account for 78.14% of the total genera and twenty-five temperate ones account for 21.01%. At the species level, tropical and temperate elements contributed 53.73% and 30.15% of the total species, respectively. It is characterized by tropical. This phenomenon is caused by the broad latitudes and diversified habitats in Guangxi. Comopolition genera and species have 44 genera and 77 species, accounts for 26.99% and 18.69% of total genera and species, respectively. They are main components or key genera (species) in wetland vegetation. The endemism is scarce. Furthermore, threatened species and invasive species are also discussed.