The community floristics of dominant species in protection forests was very excessive. The difference of its component was not only rather great, its component with the same stand type was also different drastically.
防护林优势树种群落植物种类多,不同优势树种群落植物种类组成差异较大,相同林分类型植物种类组成也存在较大差异。
参考来源 - 北京山区防护林优势树种群落结构研究·2,447,543篇论文数据，部分数据来源于NoteExpress
本研究为天然次生林采取合理的经营措施，指导各林分类型的经营实践活动提供理论依据。
In this study, it takes reasonable measures to operate the natural secondary forest guide the operation of the various forest types and provide a theoretical basis for practical activities.
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.
依据大量的调查资料，应用有序样本聚类方法，按林分类型、立地条件和林龄来确定次生林改造生长量划分标准；
Based on a large amount of investigating data, the authors use cluster analysis method with ordered samples to set dividing standards for the growth rate of secondary forests rechange.
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