中文摘要：

拂子茅是根茎型无性系禾草,在松嫩平原常形成单优种群落斑块。以拂子茅为研究对象,根据营养繁殖世代数划分构件龄级的方法,研究分析了2013和2014年生长季末期,种群分株、根茎、冬性苗和芽的年龄结构与营养繁殖力。结果表明,拂子茅种群的分株由2个龄级组成,1a分株在数量和生物量上所占比例均大于80%,呈增长型年龄结构;根茎由3个龄级组成,其累积长度和生物量以2龄所占比例最高,达到40%以上,呈稳定型年龄结构;1龄分株有较高的生产力,对种群贡献最大;1龄根茎贮藏力最高,是地下营养物质的主要贮藏部位;潜在种群由冬性苗、分蘖节芽、根茎顶端芽和根茎节芽组成,其中1龄分蘖节芽均超过500个/m2,占优势地位,呈稳定型年龄结构;分株的营养繁殖力高于根茎10倍以上,对于潜在种群贡献最大;干旱导致2014年2龄构件的生长受到限制。

英文摘要：

Calarnagrostis epigejos is a typical clonal rhizomatous plant. It always forms mono-dominant patches in the meadows of the Songnen Plain, China. In this research, a survey of age structures of plant modules was conducted in the late growing season of 2013 and 2014 and analysis was carried out. Age structures of ramets, rhizomes, daughter ramets and buds were classified according to the generation of vegetative propagation. Veg- etative propagative ability was calculated by the ratio of the total buds or daughter ramets to total ramets or rhizomes and storage ability of rhizome was calculated by the ratio of rhizome biomass to its length in C. epigejos populations. It was found that tamers in C. epigejos population consisted of two age classes （lst and 2nd age class） and the proportion of number and biomass on 1st age class of ramets was higher than 80%, which was an increasing age structure. Rhizomes could be grouped into three age classes （lst, 2nd and 3rd age class） and the proportion of accumulate length and biomass was the greatest （more than 40%） on 2nd age class, which age structure was stable. Ramet productivity （ramet biomass/ramet number） of 1st age class was 4% higher in 2013 and 21.6~ higher in 2014 than 2nd age class, so ramets on 1st age class had greater contri- bution to the population. Storage ability of rhizome on 1st age class was the highest, so rhizomes on 1st age class were the main storage part of the underground nutrients. Potential population include daughter ramets,tiller buds, apical rhizome buds and nodal rhizome buds, it was a stable age structure. The vegetative propagative mes. Comparing the two years of rainfall, the growth of and the 1st age class tiller buds was dominant, which ability of ramets was significantly higher than rhizo- 2nd age class modules was more sensitive to the ex-treme drought in 2014 than others.