1·Setting up alluring tree should be on sides of ventilative and sunny forest road or in forest windows with a less crown density.
是采取诱杀措施的重要时期；诱饵树的设置应以通风向阳的林道旁或郁闭度较小林分的林窗中为宜，距寄主植物有一定距离的林缘更佳。
2·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.
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。
3·Comparative experiments was conducted on the effect of one-time irrigation and fertilization on the DBH and crown density of young 107 poplar plantations of even planting density.
对等密度107杨幼龄林进行一次性施肥灌溉措施对比试验，结果表明，一次性水肥措施对其幼林未郁闭前各龄期胸径生长量和郁闭度均有促进作用。
4·He needed to be sure of the weight and density of the gold used in the crown.
他需要确定用于冠中的黄金的重量和密度。
5·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.
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。
6·The species component, density and index of crown cover in the tree layer effect on distribution of illumination and under plants in the plant community.
群落中光照的分布状况受乔木层的种类组成、密度与冠幅指数等因子的影响，且对下层植物分布有较大的作用。
7·The DBH, volume, crown breadth and the growth of shoots increase obviously as the density decreases.
胸径、材积、冠幅、新梢生长量随造林密度减小显著增大。
8·The studied items include the relationship between planting density and crown structure, planting density and growth characteristics, planting density and biomass etc.
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。
9·The density of Manchurian linden and the tree-crown -nesting birds shows the conspicuous negative correlation.
椴 密度与树冠营巢鸟类的种类存在显著负相关关系。
10·Stand density had a weak impact on height, crown height, crown width, diameter and length of upper branches;
密度对上层木的树高、冠长、冠幅、树冠上层枝直径和枝长等的影响比较小；