查询词典 parameter of population

Based on the investigation of 12 plots Betula platyphylla population with an area of 6 000 m^2, the size structure and the life table of the population were established and the survivorship of B, platyphylla population was analyzed by the curves of survivorship, mortality rate, hazard in this paper.

根据12块总面积为6000平方公尺样地的实地调查资料，分析了白桦种群的径级结构，编制了该种群的特定时间生命表，绘制了存活曲线、死亡率曲线和损失度曲线，并用4个生存函数进行种群的生存分析。

This research concentrate on the demographical studies, by using generating population projection models of population growth, widespread study of the urban land use changes in Zwarah (i.e land use classification, land use patterns change and land use structure for 1980, 1990 and 2000), and descriptions of a number of aspects like population, housing, health education, commerce, Industry, Transportation and etc.

本文对Zwarah地区的土地利用变化进行了全面的研究，包括土地利用分类、土地利用模式的变化以及1980年，1990年，2000年的土地利用结构；并且描述了许多方面的情况，如人口、房屋、健康、教育，商业，工业、交通等。

The genetic structure of the raised population and wild population of Epinephelus malabaricus were studied by RAPD technique. Genomic DNA was extracted from 20 individuals of each population.

采用RAPD标记技术对海南点带石斑鱼养殖群体和野生群体的遗传结构进行了初步研究。

Behavioural Ecology and Populations:Population biology and population dynamics, Life history biology,Reproductive behaviour, sexual selection and the population consequences of individual behavour,Ethnobiology and evolutionary psychology,Ecophysiology.

其中行为生态学和人口包括：人口生物学和人口动力学，生命历史生物学，生殖行为，性的选择和个别行为人口推论，人种生物学和进化心理学，生理生态学。

Up to date, QTL analysis of adult-plant resistance against powdery mildew has not been reported in China. In the present study, QTL mapping of APR was conducted using a doubled-haploid population derived from the cross (Fukuho-komugi × Oligoculm) and a F_(2:3) population from the cross (Bainong64 × Jingshuang16). The methods and main results are described as follows:1. A doubled-haploid population from an intervarietal cross between the Japannese cultivar Fukuho-kumugi and the Israeli wheat line Oligoculm was prouduced by means of wheat × maize crosses.

国内关于白粉病成株抗性的QTL分析尚未见报道，本研究开展了小麦白粉病成株抗性鉴定、遗传连锁图构建、白粉病成株抗性QTL分析，得到以下研究结果：(1)以抗白粉病的日本小麦品种Fukuho-komugi和以色列小麦Oligoculm杂交产生的DH群体为材料，利用313个SSR标记和37个RFLP标记，对Fukuho-komugi和Oligoculm的白粉病成株抗性进行QTL分析。

The signal plants by sexual reproduction predominated faintly over ramets in genet population, but accouted for little proportion in clone population, which shows that the ramet has large quantity and has been the main part of population.

目前有性繁殖产生的单生植株在基株种群中还略占优势，但占无性系种群的比例小，表明无性繁殖产生的无性系小株数量大，无性系小株已逐步成为种群的主要组成部分。

The analyses of social and economic development indicate that, up to 1998, the total population in Yijinholo County is 143, 949 persons, the population density is 24 persons per square kilometer, large population number results in land exploitation for food and overgrazing in rangeland. The change in temporal and spatial pattern of landuse from 1977 to 1998 demonstrates that mobile sand dunes was replaced by rangeland and woodland and partial shrubland in the middle of study area changed into rangeland and farmland from 1977 to 1987, while mobile sand dunes and rangeland transformed into shrubland and farmland in a small parts from 1987 to 1998, the above-mentioned change is proved by the change of fractal dimension index and fragmentation index at landscape and its element levels.

对近50年来伊旗社会经济发展的分析结果表明，虽然人口增长率基本上呈下降趋势，但由于人口基数较大，截至1998年底，伊金霍洛旗的人口总数达143949人，人口密度为24人／平方公里，较高的人口密度带来了更多的生存需求，使得大量的草牧场被开垦，而剩余的则严重超载。1977-1998年间伊土地利用结构总体格局变化的分析结果表明，1977-1987时段内主要是流动沙地为草牧场和乔木林地所取代，伴随着中部的部分灌木林地转换为草牧场和农地：而1987-1998时段内主要是草牧场和流沙地为灌木林地和农地特别是灌木林地所取代，而景观及各景观要素的分维度指数和破碎度指数的变化也充分证实了这一结论，虽然在前10年（1977-1987年）中大面积的灌木林被砍伐，但土地利用格局的整体变化间接地反映出该时段内荒漠化的状况正在发生逆转。

Based on GIS, this paper quantitatively analyses the relationship between population distribution and environmental factors including elevation, land use, road system and river system, and the relationship between population density and residential area density in Qinghai-Tibet plateau. These relationships lay a foundation for spatialization of population census data in the study area.

本文利用GIS工具定量地分析了青藏高原地区人口分布与海拔高度、土地利用、道路网、河流水系等环境因素的关系以及人口密度与居民点密度之间的关系，这些客观存在的关系是进行人口统计数据空间化的基础。

B. Population Density. Population density will affect theb. Population Density.

b。人口的密度：人口的密度影响到厕所的可用空间和种类。

It is under the blow that weigh calamity, latter-day Anhui population produced bigger change, calamity causes population amount to drop, come from 1868 1949, anhui population is in all the time 20 million the left and right sides wanders.

在重灾打击之下，近代安徽人口发生了较大的变化，灾难造成人口数量下降，自1868年至1949年，安徽人口一直在2000万左右徘徊。

The dissecting of samples in group2 were difficult. The root of pulmonary artery and ascending aorta failed to be unfolded because fibrous tissue was tough, right and left fibrous trigone were too firm to be solved by hand. Cardiac muscle fibers couldn't be stripped along myofibrillar trajectory since they were prone to break because of their friability.

组2的心脏解剖困难，表现为纤维组织坚韧，游离肺动脉非常困难；徒手无法松解左、右纤维三角，肺动脉和主动脉根部的游离非常困难；心肌纤维坚硬、质脆，解剖时容易断离成碎块，无法沿纤维走行方向剥离。

We have battled against the odds in a province that has become increasingly violent.

我们对在一个争夺日益激烈省的可能性。