长白山次生针阔混交林叶凋落物中有机物分解与碳、氮和磷释放的关系

被引:73
作者
李雪峰
韩士杰
胡艳玲
赵玉涛
机构
[1] 中国科学院沈阳应用生态研究所
关键词
凋落物分解; 次生针阔混交林; C、N、P; 释放;
D O I
10.13287/j.1001-9332.2008.0108
中图分类号
S714 [森林土壤学];
学科分类号
0903 ; 090301 ;
摘要
采用分解袋法,研究了长白山次生针阔混交林内9种树种叶凋落物34个月的分解过程.结果表明:在次生针阔混交林中,不同树种叶凋落物的初始N和P浓度存在很大差异,叶凋落物分解速率(k)与初始N浓度和C/N显著相关.有机物剩余百分率与C剩余百分率呈显著的线性正相关关系,与N和P剩余百分率之间呈显著的二项式回归关系.N和P剩余百分率在初期阶段随有机物分解而增加,达到峰值后逐渐降低.随着有机物剩余百分率的下降,C/N和C/P均呈逐渐降低趋势,各种叶凋落物之间C/N和C/P的差异逐渐减小,分解末期分别趋近于23和350.随有机物剩余百分率的降低,N/P变化不明显,当有机物剩余百分率低于25%时,不同树种叶凋落物之间N/P差异显著下降.有机物剩余百分率可用来预测C、N和P的剩余百分率.
引用
收藏
页码:245 / 251
页数:7
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