摘要
本文根据野外定位定期观测,分析了羊草[Aneurolepidium chinense(Trin.)Kitag.]种群和羊草个体群营养繁殖的特点。结果表明,在整个生长季,羊草能不断地进行营养繁殖。在移植当年,羊草分蘖株个体群的营养繁殖潜力比实生苗个体群的更大,两个实验个体群的数量均符合于逻辑斯谛曲线增长。生殖生长对羊草的营养繁殖有较大的影响。天然割草场上的羊草种群在生物量达最高时期,种群植株的大小受密度的制约,平均单株重量与密度之间遵循-0.6699 幂的规律性变化。综合分析表明,在松嫩平原天然割草场上,羊草种群依靠营养繁殖更新延续、自我调节,但该种群尚未达到环境所能容纳的最大数量。
Aneurolepidiurn chinense(Trin.)Kitag.is a perennial rhizome grass with fertile vegeta- tive propagation.According to the field-investigation at fixed locations in fixed period,the sea- sonal change of vegetative propagation of A.chinense population and the autopopulation were specifically analysed.The results showed that both A.chinense population and the autopopula- tion could continuously make vegetative propagation in the entire growh season.The vegetative propagation brought more potential into play in the autopopulation of planting tillering than in the autopopulation of planting seedling,and the dynamics conformed to the Logistic curve growth for every experimental autopopulation in the planting growth season.The vegetative propagation of the population and the autopopulation was more seriously affected by the se- xual development and the growth.The plant size was rigorously restricted by the population density,and the change of regularity followed-0.6699 power between mean weight per plant and the population density in the period of maximum biomass in the natural cutting grassland. The comprehensive analysis showed that A.chinense population depended on vegetative pro- pagation and the population regeneration of the self-regulation,but the population hadn't far reached the most density which could be accommodated by standing conditions in the natural cutting grassland in the Songnen Plain of China.
基金
国家自然科学基金资助课题
关键词
羊草
种群
营养繁殖
生物量
密度
Aneurolepidium chinense
Population
Autopopulation
Vegetative propagation
Density dependence
Biomass
