风的扰动主要包括风速、频率等的变化，并受不同林木密度和复杂地形下的风场分布的影响。
The disturbance of wind mainly means the variety of speed and frequency of wind, and it's affected by forest density and the distribution of wind field under complex landform.
判定低质低效林的依据是林分的结构、林木个体质量、密度和郁闭度、灌木林结构和功能。
Forest structure, individual quality, tree density and crown density, and structure and function of brush forest are used to construct a criterion to the LQBF.
选择林分密度指数(SDI)作为反映林分中林木之间平均拥挤指标。
Stand density index (SDI) was applied as a quantitative index to measure mean crowd degree between trees.
应用正交试验设计方法，系统分析了不同林龄、不同立地条件和不同林分密度下人工杉木林木材纤维形态的变异规律。
By using orthogonal design, this paper systematically analysed the variation law of fiber morphology of Chinese fir wood from plantations with different ages, densities and growing sites.
内容包括造林密度与树冠结构、造林密度与林木生长特性、造林密度与生物量等关系的研究。
The studied items include the relationship between planting density and crown structure, planting density and growth characteristics, planting density and biomass etc.
不同林分密度人工林纤维长宽比差异显著；不同海拔梯度人工林及不同林木等级间基本密度差异显著。
There were significant differences in ratios of fibre length to width of plantations, with different densities, as well as in basic densities of different elevation gradient and of tree classes.
不同林分密度人工林纤维长宽比差异显著；不同海拔梯度人工林及不同林木等级间基本密度差异显著。
There were significant differences in ratios of fibre length to width of plantations, with different densities, as well as in basic densities of different elevation gradient and of tree classes.
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