Abstract：[Background] Plant growth dynamics reveals the impacts of the environment on plants. Quercus variabilis is one of the afforestation species widely used in rocky mountainous areas. It is prone to growth retardation or death under environmental stress. In order to further reveal the reasons for the stunted seedling growth and death, this paper traced the life course of each organ.[Methods] In this study, the seedlings of Quercus variabilis were sampled by hand-excavation in the nursery field. The sampling interval was 10 d in the first year, one month in the second year, and one season in the third year, and the growth, dry biomass and sugar concentration of every organ in the seedlings were measured by drying and Anthrone colorimetry.[Results] 1) During the first growing season, there was obvious growth-stasis-regrowth of stem and leaf, showing the phenomenon of blocked growth in summer.2) Except for the winter season (December-March of the next year), the roots of 1/2-year-old seedlings grew continuously. At the age of 3, the rate of root elongation was slower than at 1/2 years, with root thickening and lateral root growth being the main growth.3) Analysis of seed kernel dry matter consumption and total sugar concentration showed that the growth of seedlings in their first summer (from early June) was blocked, which was in line with the lowest seed kernel residue and total sugar. 4) In early June, the total sugar concentration of the seed kernel began to fall beneath the total sugar concentration of the leaf, indicating that the seed kernel was no longer the main nutrient donor of the plant.5) Seedlings aged 2 to 3 years began to grow from the middle of March, and growth slowed down in July, and they did not show the phenomenon of blocked growth.[Conclusions] The ecological strategy of 0-3 years old seedlings of Q. variabilis was to ensure the growth of the main roots, the 1-year-old seedlings have stunted growth in summer, which is closely related to the period of weakest seedling resistance transform (heterotrophic autotrophic transformation), and there was no stagnation in the growth of 2 or 3 year old seedlings.
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2019, Vol. 17 
