Dynamic Growth Rhythm of One-year Old Seedling of Pinus yunnanensis
Nianhui Cai · Xibei Linxueyuan xuebao · 2012
Based on the data of height and basal diameters growth of one-year old seedlings of Pinus yunnanensis,the dynamic growth rhythm was analyzed by the growth parameters which were simulated from the Logistic Model.The results showed that:(1) The basal diameters growth of one-year seedlings of P.yunnanensis exhibited a curve as slow-fast-slow while the of seedling height were presented as a double S-shaped curve as slow-fast-slow-fast-slow.(2) The growth of seedling height could be described as the stage of sprouting,fast-growing Ⅰ,transition,fast-growing Ⅱ and late growing,while the basal diameters growth could be classified as pre-growing,fast-growing and late-growing stage.(3) Two durations of the fast-growing stage in respective of seeding height occurred during 23~34 d and 89~150 d respectively,the fast growing points occurred on the day 28 and day 120,respectively.For the basal diameters,the duration of fast-growing stage was 141~211 d and the fast growing point occurred on the day 176.(4) The largest accumulations of seedling height and basal diameters occurred during the fast growing stage,accounting for 58.37% and 57.85% of theoretic maximum number,respectively.(5) The allometry phenomenon were observed on the growth of seedling height and basal diameters,it was the seedling height that took the lead during the seedling stage before 150 d,and the basal diameters after 150 d.