不同光照水平下白酒草 (Conyza japonica)氮、镁元素的分配

对多年生草本植物白酒草在高、中、低3个光照水平下，氮和镁在根、茎、叶中的分配进行了研究．结果表明：光照水平显著的影响了白酒草对叶和根的氮和镁的分配，而对于氮和镁在茎中的分配没有显著影响．高光照水平下，更多的氮和镁被分配到根中．低光照水平下．白酒草将较多的氮和镁分配至叶中．不同光照水平下白酒草氮镁分配方式和生物量分配方式的相似性说明．在氮和镁的分配利用上，植物也存在功能平衡作用．是植物生长和光合作用反馈调节的结果．

Nitrogen and Magnesium Allocation of Conyza japonica under Different Light Levels

In this paper, the effects of light levels on nitrogen and magnesium allocation in plants were investigated. A perennial forb, Conyza japonica was cultivated under three light levels and the nitrogen and magnesium allocation to the roots, stems and leaves were determined. The results indicated that the light levels affected significantly the nitrogen and magnesium allocation to the roots and leaves, but not to stems. It probably means that there could also exist a functional equilibrium when nitrogen and magnesium allocation and utilization is concerned, which is similar to that of biomass allocation. This pattern of nitrogen and magnesium allocation is mainly due to the feedback regulation between growth and photosynthesis.