楸树无性系苗期年生长参数的分析

Analysis of Annual Growth Parameters for Catalpa bungei Clones at Seedling Stage

对楸树30个无性系苗期苗高和地径的年生长动态进行了调查,并用Logistic方程对苗高和地径的生长动态进行拟合,分析了年生长动态规律及生长参数。研究结果表明：楸树无性系苗期年生长高度符合＂S＂型生长曲线。分别以苗高和地径划分苗木的年生长阶段,其苗高和地径的速生期持续时间分别为93-136 d和57-120 d,苗高、地径拟合值与苗高、地径实测值呈极显著的相关关系,相关系数分别为0.746 3和0.816 8。无性系的苗高与速生期始期、速生期结束期与速生点、地径与速生期始期呈显著的相关关系。

Seedling height and stem diameter at ground level of 30 Catalpa bungei clones at seedling stage were measured and simulated with Logistic equation.And the dynamic growth regularity and the growth parameters for C.bungei clones were analysed.Result shows that the annual height growth could be well described by an S-shaped curve.Annual growth stage of the seedlings was classified in terms of height and stem diameter at ground level,and the duration of rapid growth stages for seedling height and stem diameter at ground level were 93-136 days and 57-120 days respectively.Extremely significant correlations were found between the simulated values and the actual measured values of seedling height and stem diameter at ground level,and the correlation coefficient was 0.7463 for seedling height and 0.8168 for stem diameter at ground level.Significant correlations were also observed between seedling height of the clones and early stage of rapid growth,final stage of rapid growth,rapid growth point,as well as between stem diameter at ground level and early stage of rapid growth.