摘要
采用15N示踪的方法,研究了烟株打顶后肥料氮和土壤氮两种不同氮源对总氮和烟碱积累与分配的影响。结果表明,打顶后烟株不同部位总氮含量持续下降,烟碱含量持续上升,烟株总氮和烟碱积累量持续上升;到采收结束时,土壤氮和肥料氮分别占烟株氮素积累总量的63.57%和36.43%,由土壤氮和肥料氮合成的烟碱分别占烟株烟碱积累总量的68.22%和31.78%;烟株上部叶总氮和合成烟碱的氮素来源于土壤氮素最多,其次是根和茎,下部叶最低,但仍在52%以上;烟株吸收的氮素中,无论是土壤氮还是肥料氮,约有2/3分布在叶片,并在上部叶中分布最多,由土壤氮和肥料氮合成的烟碱约有3/4分布在叶片中,1/2以上分布在上部叶中。
The ^15N isotope was employed to determine effects of deferent nitrogenous sources on accumulation and distribution of total nitrogen and nicotine in flue-cured tobacco. The results showed that the total nitrogen content of different parts （upper leaves, middle leaves, lower leaves, stem and roots） decreased significantly; and the nicotine content of each part increased significantly in the later growth period, 65 days after transplanted. At harvest, of the total nitrogen, 63.57% came from soil mineralization, while 36. 43% from fertilizer, and, 68.22% of nitrogen in nicotine came from soil mineralization, while 31.78% from fertilizer. More than 52G of the total nitrogen and nicotine-nitrogen in each part, especially upper leaves, came from soil mineralization, followed by roots and stem, and lower leaves. Approximately 2/3 of the total nitrogen and 3/4 of the nicotine-nitrogen in the leaves came from either fertilizer or soil mineralization, with the greatest proportion in the upper leaves. Three quarters of the nicotine-nitrogen were found in the leaves, with more than 1/2 of it in the upper leaves.
出处
《福建农业学报》
CAS
2008年第3期314-317,共4页
Fujian Journal of Agricultural Sciences
基金
农业部948项目(2003Z-53)
关键词
烤烟
^13N
总氮
烟碱
物质积累
flue-cured tobacco
^15N, nitrogen
nicotine
material accumulation
