NITROGEN UPTAKE AND PLANT-GROWTH .1. EFFECT OF NITROGEN REMOVAL ON GROWTH OF POLYGONUM-CUSPIDATUM
NITROGEN UPTAKE AND PLANT-GROWTH .1. EFFECT OF NITROGEN REMOVAL ON GROWTH OF POLYGONUM-CUSPIDATUM
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DOI：
10.1093/annbot/58.4.479
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发表时间：
1986-10-01
期刊：
影响因子：
4.2
通讯作者：
KITAJIMA, K
中科院分区：
文献类型：
--
作者：
HIROSE, T;KITAJIMA, K
以虎杖为试材，研究了营养液脱氮对虎杖生长及干物质和氮素在器官间分配的影响。脱氮降低生长速率主要是由于叶面积的增长减少。加速根生长只在植物中观察到，较早收到高水平的氮。氮去除导致有效氮几乎完全分配给根系生长。氮素从地上部向根部的转移主要发生在低氮处理的植株上。净同化率（NAR）不仅受氮去除的影响很小，而且与面积上叶片氮浓度也不相关。光饱和CO2交换速率（CER）与叶片氮浓度呈高度相关。氮素利用效率（NUE）在CER（CER除以叶氮）中相对于叶氮保持恒定，表明光饱和下氮素的有效利用，而NUE在NAR中随着叶氮浓度的升高而降低。
Polygonum cuspidatum was grown hydroponically to examine the effect of nitrogen removal from the nutrient solution upon plant growth and the partitioning of dry matter and nitrogen among organs. Nitrogen removal reduced the growth rate mainly due to the reduced growth of leaf area. Accelerated root growth was observed only in plants which earlier had received high levels of nitrogen. Nitrogen removal caused almost exclusive allocation of available nitrogen to root growth. Nitrogen flux from the shoot to the root occurred in plants which had received low nitrogen. Not only was net assimilation rate (NAR) little affected by nitrogen removal, but it also was not correlated with the concentration of leaf nitrogen on an area basis. Light-saturated CO2 exchange rate (CER) was highly correlated with the concentration of leaf nitrogen. Nitrogen use efficiency (NUE) in CER (CER divided by leaf nitrogen) remained constant against leaf nitrogen, indicating efficient use of nitrogen under light saturation, while NUE in terms of NAR decreased with higher concentration of leaf nitrogen.