Effects of fertilization on nutrient concentrations of different root orders' fine roots in Cinnamomum camphora seedings.

Setting one-yearold potted Cnnmomum camphora seedlings as the research object, using exponential fertilization method, we detected the first to the fifth order fine roots C, N and P contents, in order to explore the effects of fertilization on C, camphora seedlings, and to provide a theoretical basis for C, camphor fatt growing and efficient use of resources in nurturing process. The results were as follows: (1) C concentrations of the differences orders' fine root were not significant, with the rise of the root order, while C content overall upward trend. Fertilization had no significant effect on the C concentration of fine root(P>0.05); (2) N and P concentrations of fist order roots were the maximum, while fifth order roots were the minimum, with the rise of root orders. N and P concentrations significantly decreased (P <0.05); (3) N significantly increased the N content level of the first to the second fine roots. P fertilizer significantly increased the P content of a root, mix of nitrogen and phosphorus fertilizer could improve the root uptake of P; (4) C : N : P had a significant difference in different root orders roots; (5) The firs order roots' mean C : N : P was 366 : 16 : 1. the fifth order root 807 : 12 : 1. with increased root order. C ratio of three kinds of elements increased significant ly. while the N : P changed little; (6) Fertilization did not change the proportion of C; however. N fertilizer or mix of nitrogen and phosphorus fertilizer significantly increased the N proportion of the fist to second order roots. In conclu-sion: The treatment 9 pairs of C. camphor on seedling stage indicators impatt mott significantly. A fertilizer with the nitrogen 4 g.plant-1 . the phosphorus 4 g.plant-1 and the potassium 2 g.plant-1 . would have significant promote growing for growing and development of fine roots in C. camphor seedlings. [ABSTRACT FROM AUTHOR]