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中文摘要：
采用棚内盆栽控水与添氮方法,以1a生刨花楠扦插苗为研究对象,通过设置不同的氮、水复合处理试验,研究氮、水对刨花楠幼苗光合特性和生物量分配的影响。结果表明：（1）干旱胁迫会显著降低幼苗的净光合速率（Pn）、气孔导度（Gs）和蒸腾速率（E）、总生物量和叶重比,增加茎重比,但对胞间CO2浓度、根重比和根冠比影响不显著;（2）低氮添加后幼苗的净光合速率（Pn）、气孔导度（Gs）和蒸腾速率（E）均大于对照,而高氮添加反而会抑制幼苗的光合作用;氮添加（低氮和高氮）后幼苗的总生物量均大于对照,但氮添加后对幼苗生物量在不同器官间的分配趋势影响不明显;（3）水分与施氮交互作用对幼苗光合特性和生物量分配均无显著影响。因此,在幼苗生长过程中一定要保证其充足的供水。
英文摘要：
To investigate the effects of water and nitrogen on photosynthetic characteristics and biomass allocation of Machilus pauhoi, one-year old cutting propagated Machilus pauhoi plants potted in greenhouse were treated with different gradients of water and nitrogen. The results showed that：（1） Drought stress significantly reduced the net photosynthetic rate（Pn）, stomatal conductance（Gs） and transpiration rate（E）, total biomass and leaf weight ratio, while the stem weight ratio increased; however, the influences on intercellular CO2 concentration, root weight ratio and root shoot ratio were not significant.（2） Pn, Gs and E in the low-nitrogen addition group were higher than CK, but addition of high-nitrogen inhibited the photosynthesis. The total biomass in the nitrogen addition groups（LN and HN） was higher than in CK. The effect of nitrogen addition on the biomass allocation trend in different organs was not obvious.（3） The interaction between water and nitrogen addition had no significant influence on the photosynthetic characteristics and biomass allocation of the plant. Therefore, we must provide sufficient water during the process of plant growth.
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