小兴安岭红松混交林凋落物现存量月动态

Seasonal Dynamics of Litter Standing Crops in Pinus koraiensis Mixed Forest in Xiaoxinganling Mountains

[目的]研究小兴安岭地区原始红松混交林（红松针叶混交林和红松阔叶混交林）凋落物现存量的动态变化。[方法1采用直接收获森林凋落物和烘干称重法进行分析研究。[结果]红松针叶林和红松阔叶混交林凋落物现存总量分别为19．4324～27．2488t／hm2，21．2450—24．2791t／hm2。红松针叶混交林凋落物现存总量及各层量均在9月最高，7月最低，腐殖质层显著高于未分解层和半分解层。红松阔叶混交林凋落物现存总量、未分解层和半分解层凋落物现存量均在10月份最高，7月最低，腐殖质层现存量在各月之间差异不显著；除10月份外，各月凋落物现存量均表现出未分解层显著高于半分解层和腐殖质层。红松针叶混交林未分解层、半分解层和腐殖质层现存量之间呈极显著相关；红松阔叶混交林未分解层与半分解层凋落物现存量极显著相关，与腐殖质显著相关。[结论]凋落物总现存量和各层凋落物量月动态变化与树种群落有关。

[ Objective ] The research aimed to study dynamics of litter standing crop in virgin Pinus koraiensis mixed forest （ Korean pine-spruce mixed forest and Korean pine broad-leaved mixed forest） in Xiaoxingarding Mountains. [ Method] Direct harvesting and drying weighing of forest litter were adopted to conduct research. [ Result] The total litter standing crops were 19,432 4 -27. 248 8 t/hm2 in Korean pine-spruce mixed forest, 21. 245 0-24. 279 1 t/hm2 in Korean pine broad-leaved mixed forest ,respectively. The total and three layers litter standing crops were highest in September, the lowest in July, and litter standing crops of humus layer were significantly higher than litter layer and fermentation layer in Korean pine-spruce mixed forest. In Korean pine broad-leaved mixed forest, the total and litter layer and fermentation layer of litter standing crops were highest in October, the lowest in July, the differences among each month of humus litter standing crops were not significant, except for October, the litter layer of humus htter standing crops were significantly higher than which in fermentation layer and humus layer each month. Highly significant correlations of litter standing crops were observed among litter layer, fermentation layer and humus layer in Korean pine-spruce mixed forest. In Korean pine broad-leaved mixed forest, correlations of litter standing crops were highly significant between litter layer and fermentation layer, while significant between litter layer and humus layer. [ Conclusion ] Seasonal dynamics of total and three layers of litter standing crops were mainly associated with community types in Xiaoxinganling Mountains.