枯立物对红松洼草地植物幼苗建立的影响

枯立物的存在对于改变植物种群的动态有潜在的影响。通过人工设置枯立物高度梯度，我们调查研究了枯立物对红松洼草地植物幼苗建立的影响，结果表明，枯立物对幼苗建立有明显的影响。枯立物对种群的潜在影响主要表现在幼苗的数量上。实验模拟枯立物高度分别为0、5、10、15cm，研究结果表明，双子叶幼苗数量与枯立物的变化呈单一峰值，而莎草科植物幼苗数量与枯立物的变化呈线形关系。枯立物高度在5cm时Shannon-Wiener指数和群落均匀度Evenness（％）指数量高，其排列顺序为：5cm→10cm→0cm→15cm。

Effect of standing litter on seedling emergence

The presence of standing litter has the potential to alter the population dynamics of plants. The effect of litter on seed- ling establishment in Hongsongwa was studied using a factorial experiment with four levels of standing litter. The result showed that the standing litter had significant effects on seed germination and on seedling survival and that the potential effect of litter on popula- tion dynamics resulted almost entirely from its effect on the number of plants. In this paper, the simulation method was adopted to establish different treatments of litter layer (the heights of litter were 0, 5, 10 and 15 cm, respectively). The result indicated that the diversity and evenness are the highest with the height of 5 cm litter, followed by 10, 0 and 15 cm. The number of dicotyledonous seedlings increased till a peak value and decreased with the increase of standing litter. However,the relationship between the number of Cyperaceae seedlings and the height of standing litter can be well described by a linear increase model.