氮肥对风箱果幼苗形态和生理特性的影响

采用盆栽实验的方法，设置4种水平氮肥处理，研究不同氮肥处理对风箱果1年生幼苗的生长表现、生物量积累和分配、光合生理特征、非结构性碳（NSC）积累等的影响。结果表明：施用氮肥促进了风箱果幼苗的地径、分枝数和冠幅的生长，促进了茎、叶和总生物量的积累（P<0.05），提高了茎的生物量分配比例，减少了根生物量的分配比例；施用氮肥显著提高了净光合速率、叶氮含量、茎中的可溶性糖和NSC的积累（P<0.05），但减少了根中的可溶性糖和NSC含量（P<0.05）。不同水平氮肥处理间（N1、N2、N3）的大部分指标差异并不显著，说明风箱果幼苗对土壤养分的变化并不敏感。

Effect of Nitrogen Fertilization on Morphological and Physiological Characteristics of Physocarpus amurensis Seedlings

Growth performance, biomass accumulation and distribution, photosynthetic characteristics, non structural carbon (NSC) accumulation of one-year-old seedlings of Physocarpus amurensis was studied under four kinds of nitrogen fertilization treatment by pot experiment. The results showed that nitrogen fertilization promoted the growth of basal diameter, branch number, and crown width of seedlings. The nitrogen fertilization increased the biomass of stem, leaf and plant (P<0.05) and biomass allocation ratio of stem, and decreased biomass allocation ratio of root. The nitrogen fertilization significant increased net photosynthetic rate, leaf nitrogen content, soluble sugar and NSC in stem (P<0.05), and significant decreased soluble sugar and NSC content in root (P<0.05). However, there were no significant different in most of the parameters among nitrogen fertilization treatments (N1, N2 and N3), indicating that the seedlings of P.amurensis were not sensitive to the change of soil nutrients.