羊草种群年龄结构及无性繁殖对策的分析

天然割草场羊草 ( Aneurolepidium chinense( Trin.) Kitag.)种群的生殖枝中有 87%为冬性植株。羊草分蘖节最老为 4龄 ,其生活时间可达 5个年度。在分蘖节成株的年龄结构中 ,1、2龄株占绝对优势 ,其所占比重达 92 .5 %。 1龄株生产力最高 ,至 3龄株生活力已明显衰弱。割草场羊草种群为增长型与稳定型混合的年龄结构类型。综合分析了羊草以根茎顶端成株调节种群年龄结构的无性繁殖对策 ,以及羊草草地自然持续更新的生物生态学机制

AN ANALYSIS OF AGE STRUCTURE AND THE STRATEGY FOR ASEXUAL PROPAGATION OF ANEUROLEPIDIUM CHINENSE POPULATION

Aneurolepidium chinense (Trin.) Kitag.is a rhizome grass.Among the total earing plants of the population in natural cutting grassland, 87% was winterness plants. The oldest tillering node was four age, and its life time would reach five years.The plants of one and two age held the absolute dominant position and their proportion was 92 5% in the age structure of developing plants from the tillering nodes.The productivity of one age plants was the highest among plants of the total ages, whereas the vitalities of plants were evidently weakened by the third age.On the age structure, A.chinense population in the cutting grassland was a type of mixed population which was an expanding and a stable population.The strategy of asexual propagation, in which the age structure of the population would be regulated by developing plants from rhizome end, and the mechanism of biology and ecology on natural sustaining renovation of A.chinense grassland were comprehensively analysed.