查询词典 decrease in population

The age class structure of Salix oritrepha population in alpine, cloudy and wet area of east Qilian Mountian is studied ,on two levels of genets and their ramets and sprouting branches .The results show that genets population is very short of the first and second class seedlings,and most of seedlings belong to the third and forth classes, and the development trend of population on this level is stable;on the other hand,the age structure of remets and sprouting branches population is more complete,and its age class distribution chart likes triangle, belonging to increasing type.In general,Salix oritrepha population in this area is increasing, but its reproduct way have changed in community succession process in order to accommodate varying circumstances.

从无性基株个体种群和无性克隆分株及萌生枝种群两个层次上对东祁连山高寒阴湿地区山生柳种群年龄结构进行分析，结果表明：无性基株个体种群 0~10 龄级幼苗贮备严重不足，11~20 龄级苗木所占比重最大，种群动态呈稳定型；无性克隆分株和萌生枝种群年龄结构比较完整，结构分布图呈正三角形，种群动态表现为增长型；总体上来讲山生柳种群呈增长趋势，只是在演替过程中为适应环境其繁殖方式有所改变，导致现阶段山生柳种群两个层次结构状态。

Biomass in the rain forest was far more than that in the plantation of 12 years,especially for the shrub layer.But the biomass of litterfall collected in the plantation was greater than that of the rain forest for the reason that Betula alnoidis defoliated in dry seasons.9 Four years observation found that soil bulk density tended to increase first, then decrease after planting trees;total soil porosity and non-capillary porosity tended to decrease and after few years they recovered to different degrees;the soil cation exchange capacity for all forest types increased;in the soil of 0-30cm depth,soil salt saturation tended to decrease;nutrient content in the soil of 0-60cm depth in the young stand tended to decline;soil effective P,effective K and N contents all tended to decrease.

山地雨林的总生物量远远大于10年生的西南桦人工林，其中灌木层的相对差别尤其巨大。94次的观测发现，人工林栽植后，土壤容重一般呈现一个先上升后下降的特点；而土壤非毛管孔隙度、土壤总孔隙度大多呈下降趋势，几年后有不同程度的恢复。

1Niche construction can lead to stable coexistence of diverse genotypes in spatially structured population, which supports a stable polymorphism even without heterozygote superiority.(2)With habitat deterioration, niche construction accelerates the formation of steady polymorphism and hence impedes the harmful influences of environment on the population, which might embody a life-history strategy of organism under the unfavorable environment.(3)Niche construction results in the coexistence with alternative polymorphism through genotype-environment feedback and limited gene flow.(4)The niche-constructing organism is an active force to alter its environment and hence the direction of natural selection in order to better survival.(5)Spatial dynamics and distribution pattern of metapopulation are profoundly influenced by time-lagged niche construction.(6)Metapopulation size can reach a fixed level in the recency effect and equal weighting of time lag but is statistical stability in primacy effect, which implies the primacy effect is most remarkable.(7)The increment in the relative weightingof each generation\' niche construction and the length of time lag are significant factors for system destabilization.(8)Moderate capacity of positive niche construction benefits the metapopulation persistence.(9)The narrowing of niche breadth can decrease the metapopulation size and thereby increase the extinction risk.(10)The coupled function of time lag and niche construction make the system oscillation and generate the spiral wave, spiral-broken and circular wave in heterogeneous habitat.The spatial distributions of metapopulation and resource content are complementary due to a phase lag of their both frequencies.(12)Metapopulation persistence with niche construction depends not only on the balance between colonization and extinction, but also on the balance between the ability of niche construction and natural dissipation of habitat.(13)Metapopula-tion can survive under certain condition when the percent of suitable patches in habitat is lower than the ration of extinction to colonization.(14)Two thresholds exist in the process of transition of habitat quality dynamics from unsuitable to suitable, which include the intensity of niche construction and the initial condition of system.(15)Metapopulation size is positive correlated with the ability of positive niche construction, which means that organism or population who has strongly positive influences on their environment plays an important role to maintain the available habitat.

通过上述几个方面的研究，主要得出以下15条结论：(1)生态位构建可使空间结构种群，甚至是在没有杂合子优势的条件下，形成多种可能的稳定基因型分布模式；(2)随着环境的破坏与恶化，种群的生态位构建作用加速其较早形成稳定多态以阻碍环境对种群的不利影响，解释了有机体在不利环境下的一种生活史对策；(3)生态位构建作用通过基因型—环境反馈机制及有限的基因交流导致基因型多态的稳定共存；(4)有机体的生态位构建作用是一种积极的动力改变环境进而改变其自然选择的方向；(5)生态位构建的时滞作用对集合种群动态和空间分布产生深刻影响；(6)集合种群大小在时滞的崭新效应和等权重效应下达到一固定值，而在首位效应下达到统计稳定，表明首位效应的影响最显著；(7)首位效应下生态位构建相对权重的增量和时滞的长度是影响系统不稳定性动态的关键因素；(8)适中的生态位构建强度有利于集合种群的续存；(9)生态位宽度变窄会减少集合种群的数量从而增加其灭绝风险；(10)时滞和生态位构建的双重作用使系统产生周期振荡，并在异质性环境中产生稳定的螺旋波，破碎的螺旋波和环形波三种分布模式；(11)集合种群与资源含量的空间分布因为相滞而互补；(12)具有生态位构建的集合种群续存不仅取决于侵占率与灭绝率之间的平衡，而且依赖于生态位构建能力同其生境的自然消耗速率之间的妥协；(13)当生境中适合侵占的斑块比例小于其侵占率与灭绝率之比时，生态位构建作用促使集合种群在一定条件下续存：(14)生境斑块的状态从不适合到适合转变过程中存在生态位构建强度和系统初始条件这两个阈值；(15)集合种群的大小同正生态位构建能力正相关，意味着对环境具有较强正作用的有机体对维持有效生境起积极作用。

Results:The level of total anaerobic population and total aerobic population of excrement specimens of three kinds of IBS sufferers were different significantly, particularly the level of bifidobacterium and cillobacterium(P.01);the level of bacteroid population was higher significantly in diarrhea-predominant and mixed type of IBS sufferers (P.01);the level of enterococcus population was higher significantly in diarrhea-predominant IBS sufferers(P.05);among the aerobes, the number of Escherichia coli and Staphylococcus aureus colonies were increased by different level(P.01or0.05) in the IBS suffers, in particular, the number of Escherichia coli colonies in diarrhea-predominant IBS sufferers increased most significantly.

结果：三种类型的IBS患者粪便中总厌氧菌群和需氧菌群数目与健康人差异明显，特别是双歧杆菌属和乳酸杆菌属明显减少（P.01；拟杆菌菌落数在腹泻型和混合型IBS患者中明显增加（P.01）；肠球菌菌落数在腹泻型IBS患者中明显增加（P.05）；需氧菌中患者组大肠杆菌和金黄色葡萄球菌菌落数均不同程度增加（P.01或0.05），大肠杆菌菌落数在腹泻型IBS患者中增加最明显。

The study also summarizes the theories of rural population flow both home and abroad from the economic perspective, and makes the model of the rural population flow in the background of politics, Economy, society and culture in the transition period of China upon the binary economic structure theory, by-business theory,"push-draw"theory, anticipated revenue hypothesis, new labor force move and other population flow theories. Through the empirical analysis the study has demonstrated the economic motivations of population flow in the rural areas of Henan Province.

文章总结了国内外从经济方面研究农村人口流动的基本理论，特别是在二元经济结构理论、兼业理论、"推——拉"理论、预期收入假说、新劳动力转移理论等人口转移理论的基础上，结合中国转型期的政治、经济、社会、文化背景，构建了转型期中国农村人口流动的理论模型；经过实证分析，对河南省农村人口流动的历史过程和现状有了较为全面的认识，这对河南省农村人口流动的经济动因有了明确的认识。

Methods: Choosing some high hazardous population (sex service distaff, long distance truckers), frail population, common population (community inhabitant, community commission leader) being target population, exploring their acknowledge of AIDS knowledge and behaviour transformation, carrying out health education and behavior intervention by lots of methods, and investigating their acknowledge of AIDS knowledge and behaviour transformation after intervention.

分别选定一定数量的高危人群、脆弱人群、一般人群作为目标人群，对他们进行艾滋病知识知晓和行为形成调查，利用多种形式对他们开展健康教育和行为干预工作，并在干预结束后再次对他们进行艾滋病知识知晓和行为形成调查。

Erysimi CarE activity both of resistant populations and of susceptive population were trend to normal school, and the resistant L. erysimi populations have significant higher CarE activity than susceptive L. erysimi population. Thereinto, the activity level of CartE in Hongtang L. erysimi population is the highest among the four field populations, which is tally to the result of drug-fast test on each population.

对各地菜缢管蚜种群个体羧酸酯酶研究结果表明，无论是抗性种群还是敏感种群，其个体羧酸酯酶活性分布频率均趋于正态分布，即两头低，中间高；各抗性种群的羧酸酯酶的活性水平明显高于敏感种群，其中以洪塘菜缢管蚜种群的羧酸酯酶活性水平最高，这跟各种群的抗药性监测结果亦相吻合。

As showed above, we could draw the conclusion that H3 viruses could cause outbreaks or local epidemics in Shanghai for the immune of population to the new emerging antigenic drift was still unknown though there was strong immune barrier to the previous vaccine strain, H1 viruses also may caused epidemics as the population had a weak immune protection to the previous reference strains A/New Caledonia/20/99-like and part of the recent isolates were distingwishing from them and continued to evolute on the new reference strain, and H5N1 HPAI activities has expanded its geographical range thus increasing the size of the population at risk as the continuing emergence of human cases which give the virus an opportunity to evolve towards a fully transmissible pandemic strain. We should keep eyes on the human cases of avian influenza virus an its variation for the H5 isolates in Shanghai also has the possibility to infect human directly and the infection of H5, H9 viruses had previously occurred in the population especially in those contacting with animals.

综合上述分析结果，我们认为上海地区人群虽然对原有的H3亚型参考病毒株有较高的免疫保护，但H3亚型病毒HA已出现新的抗原漂移，人群现在对新变异株的保护水平尚未知，有可能在未来引起局限性暴发甚至地方性流行；人群对H1亚型流感病毒免疫保护水平低，同时H1亚型流感病毒株部分与原推荐疫苗株抗原性差别较大，并在现推荐疫苗株基础上继续变异，需警惕发生流行的可能性；H5N1亚型高致病性禽流感地域范围扩大，人间病例不断发生，存在演变成大流行株的威胁，上海市H5亚型禽流感病毒株存在跨宿主屏障感染人类的可能性，而且已发现人群尤其禽、畜类动物接触人群中存在H5、H9亚型流感病毒的既往感染，应警惕禽流感病毒的变异和人间病例的发生。

Population of old age of 60 years old of above year growth will exceed 10 million, population of old age of 60 years old of above will achieve the fastigium with aged population 400 million, occupy the 1/4 left and right sides of total population about.

特别是下一个世纪二三十年代，是我国老年人口急剧增长的时期。60岁以上老年人口年增长将超过1000万，人口老龄化的高峰期60岁以上老年人口将达到4亿，约占总人口的1/4左右。

The number of Hans population was about three million. They were consisted of three parts of the populations, army migration population, Hans population governed by the local administration and Hans population of Mu's fazenda.

笔者注意到以往研究中忽略了沐庄隐含的汉族人口数，故文中首次通过人地比的换算，考察了沐庄隐含汉族人口的情况，使明代后期云南汉族人口的估算数更加接近客观实际。

As of Tuesday, Google's results were still censored in China.

截至周二，谷歌的搜索结果仍受中国审查。

In order to make the positive action increase and negative one decrease, the sub-forces of the social factors must be adjusted to form a centripetal force.

在这一过程中，人的主体性发挥是社会有机体健康发展的灵魂。