目的研究甘草1年生播种苗苗高、地径的生长动态变化及生物量分配模式。方法播种后动态测定甘草播种苗地上和地下部分的生长量和生物量。结果甘草整个生长期可划分为4个阶段,即出苗期、生长初期、速生期和生长后期,苗高和地径速生期的生长量分别占年生长量的63.3%和50.2%。根的生物量增长速率明显高于叶和茎的增长速率,7月20日~9月20日是甘草播种苗生物量积累较快的时期。甘草播种苗根、茎、叶的生物量分配比例为49.02∶17.75∶33.23,地下部分与地上部分生物量之比(R/T)为0.96。苗高与地下部分生物量和总生物量的相关系数分别要大于地径与两者的相关系数。结论苗高、地径的生长动态符合S型生长曲线,可用Logistic方程拟合。苗高、地径与地下部分生物量和总生物量呈线性相关。

Objective To study the growth rhythm of height, diameter at ground and the distribution of biomass of annual seedlings of Glycyrrhiza uralensis. Methods Dynamic measurings were carried out after sowing to determine the indexes including the growth quantity and biomass of overground and underground part of annual seedlings of G. uralensis. Results The growing period can be divided into four stages: the emergence phase, initiation phase, prosperous phase, and late phase. The growth quantity during the prosperity period accounted to 63.3% and 50.2% of biomass of the whole year. The growth rate of root was much higher than that of the stem and leaf. The accumulating rate of biomass is the highest during the period of the July 20th to September 20th. The biomass distribution ratio of root, stem, and leaf was 49.02∶17.75∶33.23, and the biomass ratio of underground part to overground part was 0.96. According to regression analysis, the height and diameter at ground were liner correlation with underground biomass and total biomass was individually larger than that of two biomasses of diameter at ground. Conclusion The growth pattern of the height and diameter at ground is accordance with S curve and can be simulated with Logistic equation. The height and diameter at ground is linearly correlation with the underground biomass and total biomass

国家自然科学基金资助项目(30271074)