不同林龄油松针叶凋落物初期分解特性比较  

Study on initial decomposition characteristics of Pinus tabulaeformis needle litter at different stand age

作　　者：吕瑞恒[1,2] 李国雷[1] 刘勇[1] 金虎范[1] 林娜[1] 

机构地区：[1]北京林业大学,省部共建森林培育与保护教育部重点实验室,北京100083 [2]新疆塔里木大学植物科学学院,新疆阿拉尔843300

出　　处：《南京林业大学学报（自然科学版）》2013年第2期39-44,共6页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家自然科学基金项目(30972353)

摘　　要：应用凋落袋法,研究了北京山区24、32、40年生油松(Pinus tabulaeformis)人工林针叶凋落物初始化学组成、分解速率以及养分释放过程。结果表明:凋落物初始基质无机养分含量、灰分、粗蛋白、C/N在3个林龄之间差异性明显(p<0.05)。凋落物失重率季节动态变化表现为双峰型,且季节变化明显。随着林龄的增大,针叶凋落物年平均分解速率、分解系数k值逐渐增大。通过重复测量设计的方差分析可知,随着分解时间的延长,失重率、N剩余百分率在不同林龄间均有显著性差异,而P、K、Ca、Mg元素的积累释放受林龄影响不明显(p<0.05)。To explore the impact of stand age class on litter decomposition process,initial chemical composition,decomposition rate and nutrient releasing process of needle litter were studied with litter bag method in 24,32,and 40 years old Pinus tabulaeformis plantations in Beijing mountain areas.The results showed that initial inorganic nutrient content,ash content,crude protein content and C/N value were significant differences among three stand ages（p0.05）.Dynamic changes of needle litter weight loss rate were a double-peak curves with an obvious seasonal dynamics.The average annual decomposition rate and decomposition coefficient（k）gradually increased with the stand age.Repeated test showed that weight loss rate,percentage of N remaining were significant differences at different stand ages,but percentage of P,K,Ca,and Mg accumulation and release were not obviously effected by the stand ages（p0.05）.

关 键 词：针叶凋落物 林龄 分解 养分释放 油松 

分 类 号：S718[农业科学—林学]