虉草人工草地的生长动态研究

对虉草人工草地的株高、生长速率、种群密度、种群出生率和地上生物量动态进行了研究,结果表明:虉草种群出生率呈现多峰型周期性变化,整个生长季出现3次峰值,以拔节-抽穗期种群出生率最高(41.77%);株高生长曲线呈单峰型,孕穗-开花期生长速率最大(3.17cm/d),盛花期后生长速率递降;株高与叶片数的季节变化动态均呈"S"型曲线;随草地年龄增加,地上生物量和种群密度呈现逐渐上升的趋势,表明试验期内虉草种群仍处于增长期。

Study on the Growth Dynamic of Reed Canarygrass on Sown Pastures

The dynamic changes of plant height,growth rate,population density,natality rate of population and aboveground biomass of reed canarygrass(Phalaris arundinacea L.) on sown pastures were studied to provide theoretical basis for development and utilization of the plant resources.The results showed that the natality rate of reed canarygrass population presented a periodic changes in multi-peak and showed three peaks in the growing season,and the top value appeared at jointing-heading stage(41.77%).Growth curve of the plant height was single peak pattern,and the growth rate was the greatest at booting-flowering stage(3.17cm/d),and it gradually decreased after full flowering.Dynamics of seasonal variation of plant height and leaf number of reed canarygrass were all accord with characteristics of "S" type growth curve.The population density and aboveground biomass gradually rose with increasing of population age during the experimental period,showing that population of reed canarygrass was in increase period.