关键词: 品牌定位模型, 品牌定位模型

Abstract:

In order to explore the effects of different nitrogen levels on the growth and photosynthetic physiological characteristics of Camellia semiserrata Chi., an exponential fertilization trial was conducted with 6 nitrogen dose levels (applying a total of 0, 1000, 2000, 3000, 4000, 5000 mg/seedling in this experiment) of nitrogen to research the effects of different nitrogen levels on height’ ground diameter’ biomass and photosynthetic physiology characters of Camellia semiserrata Chi. It was indicated that: nitrogen exponential fertilization could bring a significant impact on growth and photosynthetic physiology of seedlings. (1) The heights of Camellia semiserrata Chi. fertilized by 0 mg/seedling achieved the worst effect. The height and ground diameter of Camellia semiserrata Chi. fertilized by 4000 mg/seedling achieved the maximum, the biomass fertilized by 1000 mg/seedling achieved the maximum. From the growth performance of Camellia semiserrata Chi. among different treatments, nitrogen had a greater impact on height than biomass and the effect on ground diameter was the least. (2) Effects of varied nitrogen exponential fertilization treatments on photosynthetic characteristics of Camellia semiserrata Chi. showed similar law. The net photosynthetic rate showed 2 times increasing firstly and then reducing. With the increase in the amount of nitrogen fertilizer, the changing trend of the transpiration rate and internal CO2 concentration kept consistent with the changing trend of stomata conductance.