中文摘要：

无性系植物根茎不仅具有营养繁殖和扩展种群的功能,也是无性系家族中芽和分株生理整合的通道。采用单位土体挖掘取样,对扎龙湿地单优种群落芦苇种群根茎进行调查,比较了湿生生境和水生生境根茎长度、生物量和干物质贮量的季节变化。结果表明：芦苇种群根茎长度、生物量和干物质贮量均以湿生生境显著大于水生生境;8月前,根茎长度缓慢增加,8月后,根茎长度迅速增加,以3龄最长,6龄最短;根茎生物量、干物质贮量先下降后上升,8月最低,至10月休眠期均已超过营养生长初期,生物量以3龄最大,1龄最小,干物质贮量以5龄最高,1龄最低;不同龄级根茎长度及年龄谱与月份间呈线性相关（R^2〉0.81,P〈0.05）,不同龄级根茎生物量与月份间呈二次曲线关系（R^2〉0.98,P〈0.05）,生物量年龄谱与月份间呈线性相关（R^2〉0.80,P〈0.05）,5个生育期根茎干物质贮量与龄级之间呈二次曲线关系（R^2〉0.86,P〈0.05）。芦苇种群根茎长度、生物量、干物质贮量有着相同的季节变化规律,不同龄级根茎的寿命与养分的输出消耗和养分的再输入补偿密切相关。整个生育期内,生境异质性对芦苇种群根茎动态及年龄结构的影响均存在,且引起的差异也相对较稳定。

英文摘要：

Clonal plant rhizome not only has the function of vegetative propagation and population expansion,but also acts as the physiological channel between the integration of bud and ramets in clonal family. By sampling the soil from a unit area,a comparative study was performed on rhizome length,rhizome biomass and rhizome dry matter storage of Phragmites australis growing in wet and aquatic habitats. The results showed that P. australis population growing in wet habitat was significantly superior to the one growing in aquatic habitat. The rhizome length increased slowly before August,while increased rapidly after August,with 3rd rhizome the longest and the 6th rhizome the shortest. Rhizome biomass and rhizome dry matter storage decreased at the beginning but increased afterwards. Both of them were lowest in August,and then started to increase until the period of dormancy in October. By that time,the rhizome biomass was much greater than that in the early stage of vegetative growth,with 3rd rhizome the largest and 1st rhizome the least. Regarding dry matter storage,the 5th rhizome was the heaviest,while the 1st rhizome was the lightest. There was a linear correlation of the rhizome length and the age spectrum of different age classes with the growing months. Meanwhile,there was a quadratic function correlation between rhizome biomass of different age classes and growing months,a linear correlation between age spectrum of rhizome biomass and growing months,and a quadratic function correlation between rhizome dry matter storage in five growth periods and age classes. The similar seasonal patterns were observed on the growth of rhizomes length,rhizome biomass and rhizome dry matter storage of P. australis population. The lifetime of rhizome associated with different age classes had a close relationship to the consumption and input back-off of nutrients. The heterogeneous habitats had an effect on both rhizome dynamics and age structure of P. australis population in the entire growth period,and the difference was relativel