北方设施栽培条件下氮素水平对辣木幼苗生长的影响

为了明确辣木幼苗速生期氮素需求规律，在北方设施条件下，通过设置5个氮素水平处理，研究施氮对辣木幼苗株高、地径生长及其叶片N、P、K养分含量、色素含量及光合特性等方面的变化特征。结果显示，随着氮素水平增加，辣木株高、地径、叶片N、P、chla、类胡萝卜素、总色素含量及光量子效率（Q）呈先上升后下降的变化趋势，光补偿点（Lcp）呈先下降后上升趋势；株高生长与叶片P及chla显著相关，地径与暗呼吸速率（RD）及叶片K含量显著相关；当氮素水平在30 g·株^-1（N₃）时，辣木生长速度最快，植株养分状况较好、光能利用率最佳。

Effects of Different Nitrogen Level on Growths of Moringa oleifera Seedling under Northern Facilities of China

In order to clarify the rule of Moringa oleifera for nitrogen demand on fast-growing period, the experiment was carried out under five nitrogen level gradients applied on Moringa seedling, and to study the difference of characteristics on the growth of height, ground diameter, the contents of N, P, K in leaf, the contents of blade pigment and photosynthetic characteristics. The result showed that the height, ground diameter, N, P, chla, total pigment, carotenoid in leaf and photo-quantum efficiency rose first and descended later accompanied with nitrogen level increasing, while the light compensation point showed the contrary. Plant height growth was significantly correlated with leaf P and chla, and ground diameter was significantly correlated with dark respiration rate and leaf K content. When the nitrogen level was in 30 g·ind.^-1(N₃), M.oleifera seedling growth was the fastest, the plant nutrient status was better, and the utilization rate of light was the best.