为使用方便起见，以信息量最多的第一主分量，编制核桃楸立地类型上层林分高表，应用于林业生产实际。
For convenience, the principal components with most messages are used in making an upper stand height table of the manchurian walnut site types which will be applied to the forest production.
利用近50年的系统定位观测资料，分析红松果材兼用林不同林分密度与直径、树高、冠幅等主要测树因子的关系。
By using observation data over 50 years, the paper systematically analyzed the relations of different stand density with diameter, height, crown of trees and so on.
在本研究中，吾人将森林分为高、中、低密度三种等级。
In the research, forest density is classified into three levels: high, medium and low.
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