Based on the survey from 32 belt-transects and 779 quadrats, it was found that slope, seed-tree, and shrub growth status are the main factors which affect natural regeneration on clear-cut sites.
通过对32个样带779个样方的调查，认为坡度、留母树否、灌木生长状况是影响皆伐后天然更新的主要因子。
Finally, the application situation of belt-vacuum-filters in the production of the seed-precipitation-onyx was reviewed, and the existed problems and the relevant solutions were introduced.
最后叙述了其在种分玛瑙生产线上的应用情况、存在问题及解决方法。
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