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- Problems existed in the Antarctic krill age determination were introduced and the methods used in the krill population age structure analysis were reviewed. 本文对国际上有关南极磷虾（Euphausiasuperba）的寿命和年龄鉴定研究的现状、研究过程中所存在的困难和问题进行了分析和探讨，对各种不同的磷虾年龄鉴定方法的特点和存在的问题进行了评述
- Based on the theory of demology, the types of population age structure are divided according to the different proportions of elderly population and young population. 按人口学理论，人口年龄结构的类型是依据老年人口或未成年人口在人口中的不同比例来划分的。人口年龄结构类型分为年轻型、成年型和老年型。
- Population age structure and recruitment information were obtained using an age-DBH (diameter at breast height) regression from the sampled cores and the DBH measured on all trees in the plots. 某一地区的太阳辐射能量高常会导致高温少雨，故高强度的太阳辐射使表土的湿度降低而不利于树木的径向生长。
- Population aging refers to the course of social development in which the proportion of the elderly population continuously rises in the general population and as well as the aging of population age structure. 所谓人口老龄化，是指在一个国家或地区因人均预期寿命的不断延长而使老年人口在总人口中的比重上升和人口年龄构成老化的社会发展过程。
- POPULATION AGE STRUCTURE AND LIFE TABLE OF BLACK BEAR 黑熊种群年龄结构和生命表初探
- STUDIES ON REPRODUCTION AND POPULATION AGE STRUCTURE OF SUNCUS MURINUS 臭?的繁殖和种群年龄结构
- Rodent pest control on reclaimed forest and pasture land from cropping--Studies on population age structure of large field mouse 退耕还林还草地鼠害治理--大林姬鼠种群年龄结构的研究
- Attending the maximum total LW(liveweight) output, the optimal stocked ewe population age structure and relative off-take strategy as follows: P_1=P_2=46.1%, P_3=P_4=3.9%; 畜群的年总淘汰率为0.;461;母畜的最大使用年限为4龄。 相应数学表示为:P_1=P_2=46
- Age structure is a foundational base to study the population dynamics. 年龄结构是研究种群动态的重要基础。
- Population age structure 种群年龄结构
- Age structure dynamics of virgin Larix gmelini forest. 兴安落叶松原始林年龄结构动态的研究
- Age structure may also be represented by a survivorship curve. 存活曲线也可以反映年龄结构。
- Judging method of individual age and age structure of Stellera chamaejasme population in degraded steppe. 退化草原狼毒个体年龄判定方法及其种群年龄结构的研究。
- Age structure and regeneration mechanism of Acanthopanax senticosus population were researched in different ecological environments. 对不同生境刺五加种群的年龄结构和更新机制进行了初步研究。
- Their numbers could skyrocket as the U.S. population ages. 另外，这项技术还可应用于无人驾驶车辆等军事领域。
- In this paper, we study a nonautonomous SIS model with age structure. 摘要研究具有年龄结构的非自治的SIS模型。
- Most of them as de jure population,whose age structure and sex struc-ture were of imbalance,had developed the Northeastern frontier region with the minority nationalities there. 由于种种原因而造成年龄和性别结构的失调。他们与各少数民族共同开发东北边疆。
- These problems include the high sex ratio and the growing population aging. 例如出生人口性别比偏高、人口老龄化等。
- According to its age structure and life curve, Caragana korshinski population were mainly made up by young individuals yet, and tended to be increasing or developing stably. 通过对柠条年龄结构图和种群静态生命曲线分析发现，柠条种群幼龄植株较多，群落处于进一步扩大或者稳定发展的趋势。
- An endowment system will be established to meet the trend of population aging. 建立适应老龄化发展趋势的养老保障体系。
