秦岭山地华山松和锐齿栎典型林分化学计量特征分析  

Stoichiometric Characteristics of Pinus armandii and Quercus aliena var. acuteserrata Stands in the Qinling Mountains

作　　者：董宁宁[1] 李哲[1] 侯琳[1] 杨安定 岳亚军 

机构地区：[1]西北农林科技大学,陕西杨凌712100 [2]宝鸡市马头滩林业局,陕西宝鸡721006

出　　处：《西南林业大学学报（自然科学）》2017年第3期81-87,共7页Journal of Southwest Forestry University：Natural Sciences

基　　金：林业公益性行业科研专项项目(201304307)资助

摘　　要：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。To understand how species and stand age affects stoichiometric characteristics of plant leaves, litter and soil, and the limiting status of N, P nutrients, Pirtus 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. alierta var. acuteserrata, while N and P concentrations were lower. Species have extremely significant effects on the stoichiomet- fie 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.

关 键 词：秦岭山地 华山松 锐齿栎 天然林 树种 龄组 化学计量 

分 类 号：S713[农业科学—林学]