紫玉兰苗木的年生长规律

研究了紫玉兰一年生播种苗苗高、地径的年生长变化及其生物量组分的分配模式。结果表明,苗高、地径的生长规律符合S型生长曲线;可用logistic方程来拟合。可将苗木的生长时期划分为4个阶段:即出苗期(4月26日以前);生长初期(4月26日至6月17日);生长盛期(6月17日至9月30日);生长后期(9月30日以后)。其中,生长盛期的生长量占年生长量的71.1%左右。利用回归分析,得出苗高、地径和地上部分生物量呈线性相关,且地径和地上部分总生物量的相关系数大于苗高与其的相关系数。并拟合了苗高、地径及主根生长之间的最优回归方程,以了解苗木各部分生长的相关关系。

Study on Annul Growth Dynamics of Magnolia liliflora Seedlings

The annul growth rhythm of height, caliper and distribution of biomass of seedlings of Magnolia liliflora was studied. The results indicated that growth patterns of height and caliper were fitted for S curves and can be simulated with Logistic equation. At the same time, the growing period of height was divided into 4 stages according to its growth rate, which were the emergence phase of seedling(before April 26), initiation phase of seedling growth (from April 26 to June 17), prosperous phase of seedling growth (from June 17 to September 30) and later phase of seedling growth (after September 30). The production of prosperity period was about 71.1% gross of whole year. According to regression analysis, the height and caliper were liner correlation with aboveground biomass, however, the correlation value of caliper with aboveground biomass were higher than that of the height. The optimum regression equations were found for the growth of seedlings height, caliper and main root, which would reveal the relations between two parts growth of seedlings.