中文摘要：

以2007—2009年的野外调查资料为依据，对洞庭湖湿地植物的组成及区系成分进行了初步研究。结果表明：（1）洞庭湖湿地共有种子植物229种，隶属于58科150属。其中草本植物占的比例高达97．9％，木本植物匮乏；（2）单种科属较多，单种科共计34科，占总科数的54．0％，单种属共计118个属，占总属的76．1％；（3）科级区系成分中，泛热带分布和北温带分布占的比例较大，属级区系成分中，温带分布属共计59属，占的比例最大，说明洞庭湖植物地理成分明显具有温带性质。

英文摘要：

Composition and floristic elements of vegetation in the Dongting Lake were investigated on the basis of the field investigation in 2007-2009. Our results showed that： （1） 229 seed plants belonging to 58 families and 150 genera were found and 97.5% of species belongs to herb plants; （2） Monotypic families and genera are rich, including 34 families and 118 genera and accounting for 54.0% and 76.1% of the whole families and genera respectively; （3） On the family level, the main floristic components are the type of pantropic and north temperate zone. On the genera level, 59 genera belongs to the north temperate zone, which is the biggest part of the whole genera, indicating that the floristic elements of vegetation in the Dongting Lake shows temperate characteristic.