Study on Annual Growth Dynamics of Azadirachta indica Seedling

Annual growth dynamics of one-year seedling,the accumulation and distribution of biomass and relation between growth of Azadirachta indica seedling and the meteorologic factors were studied.The result showed that annual growth dynamics of seedling agreed Logistic's curve feature.According to this equation,fitting model about height and caliper of seeding with meteorologic factors could be created.According to Logistic's model and continuous growth model of quadratic polynomial,the growing period of seedling could be divided into 4 stages,i.e.emergence phase,initiation phase,prosperous phase,and later phase.The growth of prosperous phase was over 70% of total increment.Period of caliper's initiation phase was shorter than that of the height increment,but the percentage of caliper's initiation period increment vs total was 2 times of height increment.The biomass'accumulation of seedling was closely related to height and caliper of seedling.The aboveground biomass was 69.1% of all biomass.The moisture content of whole tree was 1.58 times of total dry biomass.According to partial correlation analysis,the air temperature is the key factor affecting the growth of seedling among all meteorologic factors which restrict the growth of seedling.