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.
选择南方有代表性的森林游憩区进行森林环境中空气负离子水平研究，结果表明：（1）不同林分类型的森林环境中空气负离子水平差异较大。
The studies on the concentration of aero anion in some south China forest recreation areas showed: (1) The aero anion concentration has differences in different forest types.
通过对天然红松林下的更新进行调查，阐明了天然红松林下的更新好坏和林分类型及土地条件有着密切的关系，对今后天然红松林经营起到借鉴作用。
According to the renovation investigation under natural Korean pine forest, this paper states that there are con - sanguineous relationship among renovation, forest type and site conditions.
本文就竹林分类经营的必要性、可行性、经营类型划分等作了描述。
The paper describes necessity, feasibility of classifi management of bamboo stands, along with identifying management modes.
本文对赤峰市巴林左旗山杏林资源、林分现状、产地条件等进行了分类，对各类型林分、林地生产力进行了分析和评价，提出了相应的经营对策。
Stand of all type and productive capacity on area hace been analysed and evaluated, and the relevant management countermeasures have been put forward.
本文对赤峰市巴林左旗山杏林资源、林分现状、产地条件等进行了分类，对各类型林分、林地生产力进行了分析和评价，提出了相应的经营对策。
Stand of all type and productive capacity on area hace been analysed and evaluated, and the relevant management countermeasures have been put forward.
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