N素指数施肥对沉香苗期光合生理特性的影响
Effects of exponential fertilization on seedling growth and photosynthesis of Aquilarias spp
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摘要: 设置每株0、1 000、2 000、3 000、4 000、5 000 mg 6个施肥量处理(编号为Ⅰ~Ⅵ)，进行珍贵树种马来沉香与土沉香苗期N素指数施肥试验，探究不同N素供应水平对其苗期生长、光合生理特性的影响。结果表明：施入N素对马来沉香、土沉香生长及光合特性有着显著影响。地径、苗高以及生物量随着N素浓度增加而增大，至N施用量每株3 000 mg后其生长表现和生物量趋于稳定。马来沉香(1 995.33 cm2)与土沉香(1 366.57 cm2)处理Ⅳ整株叶面积最大，在苗期生长季内的比叶质量变化趋势是生长初期和末期低，而中期比较高，马来沉香对照(处理Ⅰ)与土沉香指数施肥处理Ⅰ~Ⅴ的比叶质量季节变化曲线是双峰式。马来沉香与土沉香指数施肥处理Ⅳ(3 000 mg/株)的光合能力最大。Abstract: Exponential nutrient delivery accelerating seedling growth could bring about a steady state of nutrition in the plant and improve nutrient uptake. An exponential fertilization trial was conducted with six nitrogen dose levels (applying a total of 0，1 000，2 000，3 000，4 000，5 000 mg/seedling in this experiment)of nitrogen to research the effects of different nitrogen levels on growth and photosynthetic physiology of Aquilaria malaccensis and Aquilaria sinensis seedlings. It was indicated that nitrogen fertilization could bring a significant impact on growth and photosynthetic physiology of seedlings. Ground diameter, height and biomass of seedlings increased with the increase of nitrogen supply up to 3 000 mg/seedling, after then growth performance and biomass were unchanged. The total leaf area of A. malaccensis(1 995.33 cm2)and A. sinensis(1 366.57 cm2)fertilized by 3 000 mg/seedling achieved maximum, and the lamina mass per unit area (LMA) of A. seedlings was high at midgrowth. The nitrogen exponential fertilizations played an important role in the adjustment of net photosynthetic rate, transpiration rate and light response curves of Aquilaria seedlings. Under the nitrogen fertilization level (3 000 mg/seedling), the photosynthetic physiology characters of Aquilarias seedlings reached the maximums.
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