密度对甘草苗生长及甘草酸含量的影响

目的：通过对甘草密度效应的研究,揭示由各种密度所形成的群体个体之间相互作用的规律。方法：对不同密度条件下的甘草个体和群体的物候特性、生长状况、生物量积累和分配、甘草酸含量等进行研究。结果：密度对甘草的物候特性及生长状况有一定的影响。在一定密度范围内,甘草株高速生期的起止时间随密度增大逐渐提前,速生期持续时间逐渐缩短。甘草个体生物量随着密度的增大而减少,而群体生物量则随着密度的增大而增加。甘草单株根、茎、叶生物量分配比例分别为65.02％,19.55％,15.43％,根、茎、叶生物量的RSD分别为0.57%,0.49%,0.76%。较低密度处理的甘草甘草酸质量分数在0.52%～0.59%,而最高密度处理的甘草甘草酸仅为0.29%。结论：在一定范围内,密度与甘草侧枝和地下茎萌发的时间、复叶上的小叶数量、株高和地径生长量、芦头粗度、侧根数量、单株根和枝叶量、单株生物产量及甘草酸含量成负相关,与甘草群体生物产量成正相关。

Effects of density on seedling growth and glycyrrhizinic acid content in Glycyrrhiza uralensis

Objective: To study the principle of interaction among individuals and populations in different Glycyrrhiza uralensis growth density.Method: The phenological characteristics,growth status,accumulation and distribution of biomass and glycyrrhizinic acid content of G.uralensis in different growth density were studied.Result: Density had effect on phenological characteristics and growth status of G.uralensis seedling.The fast growing period of plant was advanced with the increase of the density,while the duration of fast growing period was decreased.Individual biomass decreased with the increase of the density,while population biomass increased.Biomass proportion of root,stem and leaf in individual were 65.02%,19.55% and 15.43% respectively.Their relative standard deviations were 0.57,0.49 and 0.76 respectively.Glycyrrhizinic acid content was 0.52%-0.59% under low density and 0.29% under high density.Conclusion: The result showed that the density G.uralensis had a negative correlation with the shooting time of offshoot and underground stem,leaflet number,growth of plant height and diameter at ground,root head diameter,lateral root number,individual root and branch-leaf number,individual biomass and glycyrrhizinic acid content and a positive correlation with the population biomass.