Quantitative features of vegetative reproduction of grey-green and yellow-green Leymus chinensis on meadow and meadow steppe were studied in Tumuji National Nature Reserve, Inner Mongolia. In two vegeta tion types? the number and biomass of two ecotype L. chinensis tillers consisted of four age classes of which the 4-year tillers were the fewest. The tillers were stable or expansive age structures. The 2-year rhizomes were dominant, and were stable age structures. The productivity per tiller of 1-year tillers of the two ecotypes was the highest and the productivity gradually decreased with increasing age classes. The productivity per tiller on meadow steppe was significantly higher than those of meadow grey-green and yellow-green ecotypes. The 1-year or 2-year rhizome productivity of the two ecotypes was the highest. In temperate herbaceous communi ties, increased or stable age structures, vigorous matter production and storage of both young tillers and rhizo mes were essential reasons for sustaining flourishing perennial clonal plants.%在内蒙古图牧吉国家级自然保护区内,对草甸和草甸草原上灰绿型和黄绿型2个生态型羊草种群营养繁殖的诸数量特征进行了比较研究.结果表明,在2种植被类型中,灰绿型和黄绿型羊草分蘖株的数量和生物量均由4个龄级组成,且均以4a所占比重最小,呈稳定型或增长型龄级结构；根茎均以2 a所占比重最大,呈稳定型龄级结构；2个生态型羊草的单株生产力均以1 a分蘖株最高,且均随着龄级的增加依次减少；在整体水平上,草甸草原上灰绿型和黄绿型羊草的单株生产力均显著高于草甸；2个生态型羊草的根茎生产力均以1或2 a最高.在温带草本群落,增长型或稳定型的年龄结构、年轻龄级分蘖株和根茎旺盛的物质生产和贮存能力,是多年生无性系草本植物实现其持续繁荣的主要原因.
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