泗水县湿地种子植物区系分析

通过野外实地调查和系统分析,对泗水县湿地种子植物的种类组成和科属分布区类型进行研究。结果表明:泗水县湿地种子植物有92科276属440种,其中裸子植物5科6属8种,双子叶植物70科202属316种,单子叶植物17科68属116种。区系地理成分复杂,具有明显的温带属性,表现出热带向温带过渡的性质。在科一级有8个分布区类型,泛热带分布(34.78%)、世界分布(32.61%)、北温带分布(22.83%),三种分布类型共同构成了该地湿地种子植物的主体;在属一级有15个分布区类型,温带分布类型总比例达到49.99%,具有明显的温带属性,热带成分与世界分布比例仍然较大。

Floristic Analysis of Wetland Spermatophytes in Sishui County

Species composition and floristic types of wetland spermatophytes were investigated in SiShui County.The results showed that there were 440 species of spermatophyte belonging to 276 genera in 92 families,including gymnosperms(8 species,6 genera and 5 families),dicotyledons(316 species,202 genera and 70 families)and monocotyledons(116 species,68 genera and 17 families).With obvious temperate properties,the floristic composition was complex and diverse,which represented some transitional characteristics from tropical to temperate.These species could be divided into 13 areal-types at the genus level and 8 areal-types at the family level.Three areal-types of family:Pantropic,Cosmopolitan and North temperate,maked up the main part of the wetland spermatophytes,whose percentages were 34.78%,32.61% and 22.83% of total families respectively.All temperate components were found to be dominant,which maked up 49.99% of all the genera,while Tropical elements and Cosmopolitan owned a large proportion.