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.
林木枝下高直接影响树木的生长和树干形状，建立林木枝下高动态模型可以了解林木或林分的生长规律。
Under branch height has direct impact on woods growth and trunks form, so dynamic model established with under branch height can reflect the growth of woods and stands.
结果表明，保留密度的变化对树高生长影响不大，对林分胸径和单株材积的生长影响显著。
The results showed that the effect of the reserve density on the diameter and volume of individual tree were obvious.
通过对渭北黄土高原刺槐人工林最大林木的树干解析和年轮分析描述了林分最大两株林木的树高、直径和材积生长过程。
Growth process of height, diameter and volume of the largest two stems of some sampled black locust stands on Weibei-loess plateau were described by analyzing stem disks and growth rings.
栓皮栎人工林还具有良好的水源涵养功能，林分总持水量比杉木人工林高10%。
Oriental oak plantation also has better function of water conservation, total water-holding content of stand reaches to 10% higher than that of Chinese fir plantation.
同一处理类型对不同产量类型林分的增产效果随着高、中、低产量类型的顺序而增加。
The effect of treatment was positively correlated with the type of plantation. The higher the yield of plantation, the more the yield increased.
弦面和径面抗剪强度，林分密度相对低的林分人工林赤松低于林分密度相对高的林分人工林赤松；
The shearing strength in tangential face and shearing strength in radial face of P. densiflora wood from the stand with low density were lower than those from the stand with high density.
弦面和径面抗剪强度，林分密度相对低的林分人工林赤松低于林分密度相对高的林分人工林赤松；
The shearing strength in tangential face and shearing strength in radial face of P. densiflora wood from the stand with low density were lower than those from the stand with high density.
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