摘要：
To understand how species and stand age affects stoichiometric characteristics of plant leaves, litter and soil, and the limiting status of N, P nutrients, Pinus armandi and Quercus aliena var. acuteserrata natural for-ests with 4 stand age groups located in the Qinling Mountains, were selected to test C, N and P stoichiometric char-acteristics. The results showed that the C, N and P concentrations in each age group of 2 forests were the highest in tree leaves and the lowest in soil. The C concentration in P. armandi leaves was higher than that in Q. aliena var. acuteserrata, while N and P concentrations were lower. Species have extremely significant effects on the stoichiomet-ric characteristics of plant leaves, C content, N content, C :N and C :P of litters and P content and N :P in the soil. Stand age significantly effected on C content of leaves and litters. Also, it has extremely significant affect on P content, C :P , N :P ratio in the soil. The N :P ranges from 7. 47 to 12. 50, and the N played the dominant role in normal growth of plants.%为了解树种和林龄对乔木叶片、 枯落物和土壤化学计量特征的影响,以及N、P养分的限制特征,以秦岭山地典型林分华山松和锐齿栎4个龄组的天然林为研究对象,分析了各林分乔木叶片、 枯落物和土壤的C、N、P化学计量特征.结果表明:C、N、P含量在2种林分各龄组中表现为叶片>枯落物>土壤,华山松针叶中C含量高于锐齿栎叶片,而N含量、P含量均低于锐齿栎叶片;树种对植物叶片生态化学计量特征、 枯落物的C、N含量及C:N和N:P、 土壤P含量和N:P有极显著影响,对枯落物和土壤的C:P有显著影响;林龄对植物叶片和枯落物的C含量有显著影响,对土壤的P含量、C:P和N:P有极显著影响;该地区N:P为7.47~12.50,N成为限制研究区林分正常生长的主要元素.
