CAJ | 학술논문

　　基于植物生长模型，考虑到植株体内养分含量的稳定性，本实验采用指数施肥法对美丽异木棉、红花荷和黄花风铃木3种华南地区常见园林树种幼苗进行N素指数施肥试验。结果表明，氮素指数施肥能给植物的生长、植物的根系和叶片带来显著的影响：（1）不同氮素处理间幼苗生长差异显著，其中美丽异木棉处理Ⅵ(5000 mg)的苗高、地径及总干质量表现为最佳状态，红花荷与黄花风铃木的处理Ⅴ(4000 mg)效果最好。3个树种幼苗各生长指标受N素影响的程度表现各不相同。（2）3个树种各处理间幼苗的根系变化有差异。美丽异木棉和红花荷幼苗根系的体积、表面积、投影面积均呈现出先上升后下降再上升的趋势。氮素对根系长度、根系的平均直径、根尖数、分叉数、交叉数的影响在3个树种上有不同的表现。（3）3个树种各处理间幼苗叶片的变化有显著差异。氮素对叶片的影响表现出相似的规律性变化，几乎所有幼苗的叶片长宽比随着氮素的施入，趋势基本保持稳定，而叶面积、叶片周长、穿孔数量等指标变化有差异。
　　기우식물생장모형，고필도식주체내양분함량적은정성，본실험채용지수시비법대미려이목면、홍화하화황화풍령목3충화남지구상견완림수충유묘진행N소지수시비시험。결과표명，담소지수시비능급식물적생장、식물적근계화협편대래현저적영향：（1）불동담소처리간유묘생장차이현저，기중미려이목면처리Ⅵ(5000 mg)적묘고、지경급총간질량표현위최가상태，홍화하여황화풍령목적처리Ⅴ(4000 mg)효과최호。3개수충유묘각생장지표수N소영향적정도표현각불상동。（2）3개수충각처리간유묘적근계변화유차이。미려이목면화홍화하유묘근계적체적、표면적、투영면적균정현출선상승후하강재상승적추세。담소대근계장도、근계적평균직경、근첨수、분차수、교차수적영향재3개수충상유불동적표현。（3）3개수충각처리간유묘협편적변화유현저차이。담소대협편적영향표현출상사적규률성변화，궤호소유유묘적협편장관비수착담소적시입，추세기본보지은정，이협면적、협편주장、천공수량등지표변화유차이。
Based on the growing model of plant, and considering the stability of nutrient content in the plant,an exponential fertilization trial was conducted to research the effects of different nitrogen levels of Chorisia speciosa, Rhodoleia championii Hook.f.’ and Tabebuia chrysotricha. It was indicated that nitrogen exponential fertilization could bring a significant impact on seedling growth, root growth and leaf growth. (1) Effects of varied nitrogen exponential fertilization treatments on seedling growth of three species were quite different. The height’ ground diameter and biomass of C. speciosa. fertilized by 5 000 mg/seedling, R. championii Hook.f.’ fertilized by 4 000 mg/seedling and T. chrysotricha fertilized by 4 000 mg/seedling achieved the best effect. With the nitrogen intake, seedling growth indexes of different species had different performance. (2) Effects of varied nitrogen exponential fertilization treatments on root growth of three species were quite different. The volume and surface area, projection area of C. speciosa and R. championii Hook. f.’ presented a trend that firstly rised followed by declining and a second rising. With the nitrogen intaken, the root length, average diameter of roots, number of roots, furcation, and crossing number of different tree seedling species had different performance. (3)Effects of varied nitrogen exponential fertilization treatments on leaf length/width ratio of three seedlings presented similar, with the increase in the amount of Nitrogen Fertilizer, the changing trend of leaf length/width ratio kept steady. But the changing trend of leaf area, leaf perimeter and perforation number performed different.