针对帽儿山林区的水曲柳、山杨两种主要林分类型凋落物以及林下凋落物层进行细致的研究较少。
There were no detailed studies on litter and forest floor of Populus davidiana and Fraxinus mandshurica in this region.
不同地位指数和不同林龄杉木及其林下植物的凋落物积累量也存在明显差异，杉木凋落物积累量随林龄的增大而增加。
The accumulation quantity of litter of Chinese fir forest and its undergrowth plant at different site indices and forest ages also existed obvious difference.
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