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以东北东部山区帽儿山实验林场落叶松人工林作为研究对象，从林地凋落量、林地凋落物归还量、凋落物层现存量以及土壤理化性质的变化等方面，研究了经抚育间伐后不同年龄阶段同一落叶松林分土壤肥力的变化以及间伐与未间伐林分土壤理化性质的差异．结果表明，落叶松人工林凋落量和以凋落物形式归还于林地的营养元素呈现出随年龄增加而增长的总趋势．经抚育间伐后，由于阔叶树种的引入使凋落物的组成结构发生变化，凋落物层的分解率逐步提高，加速了凋落物中营养物质的释放和归还，减缓了凋落物积累与分解的矛盾，提高了落叶松人工林的土壤肥力．１５年间土壤有机质、全Ｎ和全Ｐ２Ｏ５平均值分别增长了３５２．００％、２２５．５３％和３４．９６％．间伐后的落叶松人工林土壤的理化性质得到不同程度的改善．
Taking larch plantations of Maoershan experimental farm in the eastern mountainous area of Northeast China as the research object, this paper studied the changes of the litterfalls, the litterfall return, the litter layer existing in the litter layer and the changes of soil physical and chemical properties, The changes of soil fertility in the same stage of Larix chinensis stand and the differences of soil physical and chemical properties between thinning and non-cutting stand. The results showed that the litterfall of Larix gmelinii plantation and the nutrient elements returned to forestland in the form of litter showed the general trend of increasing with age. After the thinning, the composition of litter changed due to the introduction of broad-leaved tree species, the decomposition rate of litter layer was gradually increased, the release and return of nutrients in litter were accelerated, the contradiction between litter accumulation and decomposition was alleviated, Improve the soil fertility of larch plantations. The average values of soil organic matter, total N and total P2O5 in the past 15 years increased by 352.00%, 225.53% and 34.96% respectively. The physical and chemical properties of the thinly-planted larch plantation soil have been improved to varying degrees.