中文摘要：

为了研究枯落物对森林更新的影响，通过林地样方调查方法在不同的季节对辽宁省清原县大苏河林场花曲柳、蒙古栎、胡桃楸等次生林的天然更新状况、林下枯落物状况和土壤种子库状况进行了调查，分析了天然次生林枯落物对天然更新的障碍作用。经过统计学显著性检验表明，枯落物对东北次生林的天然更新有一定的障碍作用，枯落物过多有效更新幼苗数量就会减少，相反，枯落物少有效更新状况就好，林下枯落物数量和天然更新幼苗数量呈负相关性。

英文摘要：

In order to study the effect of the litter on forest regeneration, according to the investigation of forestland sampling plots in different seasons of the natural regeneration, litter and soil seed bank of natural secondary forest formed by broad-leaves trees （Fraxinus rhynchophulla Hance, Quercus mongolica and Juglans mandshurica ）, the barrier effect of the litter of the main forest type on natural regeneration is analyzed in this paper. The statistical significance test analyses show that the litter has a barrier effect on the natural regeneration of northeast secondary forest. The thicker of the litter has, the fewer of the regeneration seedlings and vice versa. There is a negative relationship between the forest litter and the natural regeneration seedlings.