Objective The study aimed to learn the population quantity and dynamic of Populus pruinosa in Tarim basin.
目的了解塔里木盆地灰叶胡杨种群的数量及动态。
Significant difference can be found in pest's population quantity among different rape varieties and cultivate patterns.
油菜品种和栽培方式间害虫种群数量存在显著差异。
The paper analyzes distribution species, habitat settings, population quantity, living habit and characteristics, residence condition and serial features.
分析了分布种类、栖息生境、种群数量、生活习性、留居情况、区系特征。
The result revealed that there was obviously changed in age structure and reproduction structure of L. lagurus with the decline of the population quantity.
结果表明，随着草原兔尾鼠数量的下降，种群的年龄结构和繁殖结构都发生了明显的变化。
The reason why the population becomes the "heavy burden" of the nation economy is the great population quantity, low population quality and insufficient development and use of human resource.
人口之所以成为国家经济的沉重包袱，根本原因是人口数量过多、人口素质低下、人力资源开发利用不足。
Reproduction and mortality are two primary factors to affect population quantity dynamic.
种群的数量季节消长主要是繁殖和死亡两因素相互作用的结果。
In the stage of field population study, most study focus on the congregation and immigration of insect population, the investigation of natural population quantity.
在田间种群研究阶段，主要进行种群聚集与扩散迁移的研究和自然种群的数量调查。
In the stage of field population study, most study focus on the congregation and immigration of insect population, the investigation of natural population quantity.
在田间种群研究阶段，主要进行种群聚集与扩散迁移的研究和自然种群的数量调查。
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