用氮素指数施肥法对连香树幼苗进行不同施氮量处理，结果表明，随着施氮量的增大，连香树幼苗的株高、地径、叶片数以及根、茎、叶生物量和总生物量总体呈先增后降，均在施尿素10 g/株时达到得最大值，在施尿素14 g /株的处理下，叶面积最大。根冠比随施氮量的增加而降低。综合分析苗高、地径和生物量3个性状，确定连香树幼苗生长的最适施氮量为尿素10 g/株。

Katsura tree seedling is cultured with exponential fertilization under different nitrogen concentration， the seedling growth are studied . The results shows that with the increasing concentration of nitrogen， katsura tree of some trait which include ground the height、 diameter、 number of leaves， biomass of root、 stem、 leaves and total biomass of seedling increased and then decreased， it has the maximum value at N-10， Under the treatment of N-14 . The largest leaf area， But root shoot ratio is decreased with the increasing concentration of nitrogen . Through the comprehensive analysis of seedling height， ground diameter and biomass， we found that the optimal concentration of nitrogen for Katsura tree seedling is per plant 10 g .

S792；S147.22