毛红椿1年生播种苗各器官生长量生物量变化规律

Study on Variation in Biomass and Annual Growth Rate of Different Organs of One-year-old Toona sureni var. pubescens Seedlings

采用定期测定,有序样本聚类和回归分析,拟合毛红椿1年生播种苗的苗高、地径与时间的相关关系,苗木各器官生长量生物量相关关系的数学模型。结果表明:毛红椿1年生播种苗的生长可划分为出苗期、生长初期、生长盛期和生长后期4个时期。生长初期茎的生物量分配比例最少,仅有全株的19.85%;生长盛期则以地上部分叶和茎生长为主,叶和茎生物量分配比例分别为44.41%和35.48%,茎在生长盛期生长量大,此期苗高、地径分别占总生长量的80.71%和71.74%;生长后期以茎和根生长为主,生物量分配比例为47.79%和37.03%。苗高和地径生长量与时间、苗木各器官生长量与苗高生长量、苗木各器官生物量分配与苗木地径及苗高生长量均存在着极显著的相关关系,拟合的数学模型可靠性高,可用来估测和分析毛红椿1年生播种苗在不同生长时期各器官的生长量和生物量分配。

The relationship between the height, basal diameter and the time for the one-year-old seedlings of Toona sureni var. pubesce~ was studied, and the mathematical models to describe the correlations among the growth rate and biomass of each organ of the seedlings were formulated by means of periodic measurement of each index and with help of the ordered sample clustering and regressional analysis. The results showed that the annual growth of the one-year-old Toona sureni var. pubescens seedlings could be divided into four stages, i. e. , the emergence stage, the initial growing stage, the flourishing growing stage and the late growing stage. The stem biomass in the initial growing stage was only 19.85% of the whole plant. The growth of the above ground part of the seedlings dominated at the flourishing growing stage, the biomass of the leaves and the stem respectively accounted for 44. 41% and 35.48% of the total. The growth rate of the stem volume in the flourishing growing stage reached the maximum level, growth of the height and basal diameter respectively accounted for 80.71% and 71.74% of the to- tal growth of the plant at this stage. The growth of the stem and root system dominated at the late growing stage, the biomass of stem and root system accounted for 47.79% and 37.03% individually. The study showed that there were significant correlations among the height growth and the time, the basal diameter growth and the time, the omass allocation for one-year-old seedlings of Toona sureni var. pubescens at different growing stages around the year.