查询词典 decrease in population

There were no significant correlations between food concentration and the rate of population increase of Clone B as well as the mixis rate and fertilization rate of Clone A, B and C. However, the relationships between food concentration and the rate of population increase of Clone A and C were significantly curvilinear, with the regression equation Y=0.019X2-0.209X+0.638 and Y=0.042X2-0.402X+0.852, respectively. The relationships between the food concentration and the instant rate of population increase, the mixis rate and the fertilization rate of clone D were all significantly curvilinear, with the following regression equations Y=-0.052X2+0.609X-0.667,Y=0.994X2-15.763X+73.424 and Y=-0.251X2+15.940X-15.446, respectively.

克隆B的种群瞬时增长率、种群中的混交雌体百分率和混交雌体受精率均与食物密度间无显著的相关性；克隆A和C的种群瞬时增长率与食物密度间呈曲线相关，而其种群中的混交雌体百分率和混交雌体受精率均与食物密度间无显著的相关性；克隆D的种群瞬时增长率、种群中的混交雌体百分率和混交雌体受精率均与食物密度间呈曲线相关。

The protection measures were proposed based on the discussion of the status and trends of the population viability. The results will enrich the studies on conservation of endangered plants, and improve the cross researches of population ecology and conservation biology, and provide the scientific guidance for conservation of Cycas fairylakea population.

研究结果不仅丰富和发展了珍稀濒危植物保护研究的理论和方法；而且有利于种群生态学和保护生物学交叉领域研究的进一步深入；同时为仙湖苏铁种群保护对策的制定以及保护行动的开展提供了科学依据和方法指导。

Now the facing new problems are a relative worsen of the living conditions among the poverty population, enlarging difficultness for the poverty population to add income, increasing the cost of the anti-poverty, disjointedness between the government anti-poverty policy and its goal, investment absence and illogic structure in the anti-poverty capital, lack of inspirit mechanism of the poverty population in the poverty areas, the conflict among the anti-poverty.

目前面临的新问题是：贫困人口的生活状况相对恶化，贫困人口增收的难度加大，贫困人口的脱贫成本逐年增加，政府的扶贫政策与扶贫目标相左甚至背离，扶贫资金的投入力度不够，且结构不合理，对贫困地区和贫困人口缺乏激励机制，扶贫工作的许多矛盾相互交织。

The study of regional population evolution is helpful to reveal the rule of population distribution and is important for reasonably making population developmental policy, and for the promotion of regional sustainable development.

研究区域人口空间演变，可揭示区域人口空间分布的规律性，对于制定合理的人口发展政策，促进区域的可持续发展，均具有重要意义。

A predator model with refuge and toxicity is studied. By constructing a suitable Dulac function, it is shown that there is no limit cycle in the first quadrant, thus the globally stability of the equilibrium is proved. Further more, the paper analyzes the influence of refuge, toxicity and harvesting. It is amazing that ① if the death rate of predator is big or the harvesting effort is big, the existence of the predator is unrelated with refuge; if the death rate of predator and the harvesting effort are small, and the refuge is small enough, the population of both species is increased as the increase of refuge;② if d2=0, the increase of d1 has no influence on the prey population, while the population of predator is decreased.

研究一类有避难所、毒素作用和外界捕获影响的捕食系统，通过构造恰当的Dulac函数，证明系统在第一象限没有极限环，从而证明了平衡点的全局稳定性；分析了避难所、毒素、捕获作用对该系统最终种群数量的影响，发现：①当捕食者的死亡率大或其被捕获得多时，两种群的绝灭与避难所的存在无关；当捕食者的死亡率小、被捕获得多且避难所足够小时，随着食饵避难所的增加，捕食者种群数量也随之增加；②当毒素d2=0时，毒素d1的增加对食饵种群最终数量没有影响，而使捕食者种群数量下降。

The seedlings of both genet population and clone population appeared random for their scarcity. The viability of population will be weakened because of the lack of seedlings.

基株种群和无性系种群幼龄级的分布格局均呈随机分布，与幼龄个体的数量稀少有关。

In the base of population and quantity of house-completed data of Xi'an, the paper builds an Auto-regressive Distributed Lag Model of population Geordie coefficient and quantity of house-completed, and analyzes the relationship between the two, which find that house construction is one cause of population suburbanization, but contrarily it's not.

本文以西安市人口和住宅竣工量为基础数据，建立人口基尼系数和住宅竣工量之间的自回归分布滞后模型，并对二者的关系进行了分析，发现住宅建设是西安市人口郊区化的动力之一，反之则不然。

The basal diameter, height of aerial stem, leaf length at middle stem, leaf width at middle stem, internode length at middle stem, internodes number and panicle length of 30 plants from every population were recorded. The statistics of morphological characters showed that the distribution trends of the averages of morphological characters are similar among populations. However, the coefficients of variation within population of 7 morphological characters were very different. The CV of internodes was largest and the CV of height was smallest within population. F-statistics showed that the differences of all morphological characters among populations were significant (P.01). But the differences among populations were different between different groups. The cluster analysis proved that all populations could be divided into three types: salty reed, freshwater reed and giant reed.

对来自每个种群的30个个体的基径、株高、中部叶长、中部叶宽、中部节间长、节间数、穗长7个形态特征的统计分析表明：各形态特征平均值在种群间的分布趋势相似，但变化幅度不同，株高、叶长等营养特征变化较大大，生殖特征穗长的变化较小；7个形态指标在种群内的平均变异度从大到小依次为中部节间长、中部叶宽、穗长、中部叶长、基径、节间数、株高，种群内的平均形态变异度与生境异质性有关；7个形态指标在种群间均差异显著，但多重比较分析显示显著差异主要存在于BZH、淡水生境种群和盐渍化生境种群之间，在相似生境种群间的形态差异不显著；以形态特征为依据的聚类分析支持将15个种群分为三类：盐生芦苇、淡水芦苇和巨型芦苇。

This study showed that population genetic diversity was much lower than other Gymnosperm and there was no distinct genetic differentiation among individuals in this population. In order to protect or preserve its genetic resource,it is suggested that the most individuals in the population should be selected as we can.

研究结果表明：AFLP方法是一种十分有效的检测种群遗传多样性的分子标记，既具有可靠性又有方便高效性；元宝山冷杉种群的遗传多样性水平很低，种群内各个个体间的相似性系数很大，遗传关系很近，无明显的遗传分化，这说明该种群的适应能力差、进化潜力有限，濒危程度很高；若要保护或保存这个物种的遗传资源，建议应该选择种群内尽可能多的个体进行保护。

This thesis gives some research on Chongqing city\'s population data by several models, which reveals the population problem. The last chapter analyzes the temporary habitant population by the statistics methods.

本文根据已有的人口数据对重庆市目前的人口状况给出了几方面的研究，建立了多个模型，初步了解了目前的人口问题，为未来人口的发展提出了一些设想。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。