| One-year old Aquilaria malaccensis and Aquilaria sinensis seedlings as experimental materials were fertilizated by several methods including field survey, potted plant exponential fertilization, average fetilization, NPK ratio fertilization to study Chinese wild Aquilaria sinensis' character of nutrient and ecological enviroment in different producing areas, according to the comparison of changing regulation of plant growth, biomass, nutrition, net photosynthesis, root growth under different fertlizing methods and different doses of fertilization, the author learned the growing and fertilizing regulation of Aquilaria malaccensis and Aquilaria sinensis, and came up with the scientific fetilizing methods, proper fertilizing timing and proper fertilizing doses, in the hope to standardization the planting of Aquilaria malaccensis and Aquilaria sinensis and to protect the wild resources. The specific results are below:(1) The soil of Chinese wild Aquilaria sinensis growing areas is acid, the content of organism and nutrition elements were generally a bit low, the correlation between the nutrient elements of leaf was unobvious.(2)The growth, biomass, photosynthetic physiological characteristics and root system morphological parameter of A. malaccensis were better than A. sinensis. The annual variation rule of seedling growth and Logistic growth equations were revealed by studying the height and diameter growth and leafing amount.The N, P, K contents of leaf of A. malaccensis in November were 1.01%, 0.19%,1.57%, and the total root length, superficial area of root, root volume, average root diameter were 23.117cm,569.567cm2,19.508cm3,6.032mm. While N, P, K contents of leaf of the A. sinensis in November are 1.65%,0.13%,1.40%, and total root length, superficial area of root, root volume, average root diameter were 21.751cm,348.208cm2,12.078cm3,3.251mm.(3) The growing physiological index of seeding plants used exponential fertilization treatment wrer better than those fertilized by mean fertilization treatment. It was indicated that ground diameter, height and biomass seedlings increased with the increase of nitrogen supply, up to 3000mg·seedling-1 after then growth performance and biomass were unchanged and leaf area remarkable decreased. Critical level approach was used for identifying N, P and K deficiencies by means of foliar analysis in A. malaccensis seedlings, and the critical values of N, P, and K were 35.55,1.75 and 17.99g·kg-1, while their optimal concentrations ranged from 35.55 to 53.11,1.75 to 2.73,17.99 to 26.63g·kg-1, respectively. And the critical values of N, P, and K of A. sinensis were 37.78,3.08 and 18.89 g·kg-1, while their optimal concentrations ranged from 37.78 to 58.56,3.08 to 4.44,18.89 to 29.28g·kg-1. Based on these data. it could be inferred that 3000 mg·seedling-1 would be the optimal nitrogen amount for A. malaccensis and sinensis seedlings.The Lorentzian model as a multi-variable nonlinear model was firstly applied to the simulations using both base diameter and height, and performed the best fit to total root biomass in the two species with the highest correlation coefficients (R2,0.95～0.99) and smallest root mean squared deviations (RMSD,0.538～2.352) among all the examined models. The Paraboloid model accurately simulated base diameter, height, and performed the best fit to specific root length in the two species with the highest correlation coefficients(R2,0.92～0.99) and smallest root mean squared deviations(RMSD,3.218～6.692) among all the examined models.(4) The NPK ratio fertilization experiment was conducted with "311-A"D-saturation optimum design. DRIS nutrient diagnosis index table of A. malaccensis and A. sinensis were established.The optimal combination of 3.637g·plant-1 of N fertilization+2.50g·plant-1 of P fertilization+1.25g·plant-1 of K fertilization, under which the biomass of A. malaccensis seedlings achieved 27.688g. The optimal combination of 3.889 g·plant-1 of N fertilization+3.26g·plant-1 of P fertilization+1.33g·plant-1 of K fertilization, under which, the biomass of A. sinensis seedlings achieved 20.115g.
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