结缕草种群年龄结构的研究(英文)

Analysis on age structure of Zoysia japonica (Poaceae) population

本文用世代的方法对辽宁省岫岩县天然结缕草种群的年龄结构进行了研究。结果表明:结缕草无性系种群分蘖株的最高龄级为3龄。在生长季中均以1龄蘖为主,各月比例均占95%以上。2龄、3龄的分蘖株数量很少。因此,结缕草为增长型种群。芽的年龄构成以0龄根茎芽为主,芽数量基本为分蘖株数量的30%-40%,休眠前芽数量增加,这保证了来年种群分蘖数量的稳定。1龄蘖的生物量在整个生长季中的变化动态是:从4-7月呈递增趋势,在7月末达到最高点,然后下降。图1表3参9。

The age-structure of natural population of Zoysia japonica in Xiuyan County of Liaoning Province was studied by generational method. The results showed that the highest tiller age class was three, but 1st age class tillers held dominant posi-tion with proportions over 95% in each month during the growing seasons. The 2nd age class and 3rd age class tillers were minority in the population. So Z. japonica population was an expanding population. The zero age class buds on the rhizomes were dominant in buds age structures. The proportion of buds to tillers on quantity in each month was about 30% to 40% and reached the highest at the end of September. The increasing of buds proportion before dormancy guaranteed the quantity of tillers in the next spring. The biomass of 1st age class tillers changed with time. The biomass kept increasing from April to July and reached the highest at the end of July and then decreased.