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群落动态     
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  community dynamics
     Study on Community Dynamics of Secondary Tropical Forests:Review and Prospects
     热带次生林群落动态研究:回顾与展望
短句来源
     Using diversity indices, the analysis shows that human disturbances, community dynamics and habitat types are influential factors for species diversity, with human disturbances and habitat types to be the major factors.
     采用丰富度指数、综合多样性指数和均匀度指数对该流域湿地植被的物种多样性的分析结果表明:物种多样性受到人为干扰、群落动态、湿地生境类型等因素不同程度的影响,其中人为干扰和生境类型是导致物种多样性变化的主要原因。
短句来源
     The Study on the Community Dynamics of Main Pests and Natural Enemies and the Harmless Control in Litchi Orchard
     荔枝园主要害虫与天敌的群落动态及其无公害控制研究
短句来源
     COMMUNITY DYNAMICS AND GEOGRAPHICAL DISTRIBUTION OF RODENTS IN ZHEJIANG PROVINCE
     浙江省啮齿动物的分布及局部的群落动态
短句来源
     Primary productivity and community dynamics of mixed perennial grass pasture
     多年生禾草混播草地初级生产力及群落动态研究
短句来源
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  community dynamic
     Preliminary Study on Community Dynamic of Flower-visiting Insect on the North Slope of Changbai Mountain
     长白山北坡访花昆虫群落动态初步研究
短句来源
     Community Dynamic Characteristics and Effect Evaluation of Different Restoration Stages in Hongchiba Region, Wuxi County
     巫溪县红池坝不同恢复阶段群落动态特征与恢复成效评价
短句来源
     Three kinds of programming operators involving combination operator,harmony operator and abruption operator have been defined to perform community dynamic distribution in Particle Swarm Optimization. Thus a new random optimization tool has been developed,i. e.
     通过定义三类群落规划算子:合并算子、融合算子和裂分算子,实现了粒子群优化算法进程中的群落动态分配思想,从而构造了一种新的随机优化技术:基于群落动态分配的粒子群优化算法(Community Dynamic Assignation-based Particle Swarm Optimization,CDAPSO)。
短句来源
     Study on Community Dynamic of Pinus armandii in the Qinling Mountains
     秦岭中段华山松群落动态初步研究
短句来源
     Study on the plant community dynamic change of Potentilla fruticosa shrubs under grazing and enclosure
     放牧和封育条件下金露梅灌丛草地群落动态变化的研究
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  dynamics of community
     Analysis on the dynamics of community showed that the indices of the community were obviously fluctuated with time. During the period of June, 29 to Sept, 27, the indices of ecological concentration was low, the diversity and evenness were high. So the structure of arthropod community was rational.
     群落动态分析,群落特征指数都有明显的时间变化,6月29日到9月27日期间,生态优势度低,多样性和均匀度指数高,群落结构较合理。
短句来源
  “群落动态”译为未确定词的双语例句
     Dynamics of the Rodent Community in Cropland of the Western Sichuan Plain: Trends and Periodicity
     川西平原农田啮齿动物群落动态:趋势和周期性
短句来源
     Study on the Succession of Weeds in Mixed Perennial Artificial Grassland in the Alpine Region
     高寒地区禾草混播人工草地建植早期杂草群落动态变化研究
短句来源
     DYNAMICSOFTHERODENTCOMMUNITYINTHE CHIHUAHUANDESERTOFNORTHAMERICAⅠ.INTERANNUALFLUCTUATIONSANDTRENDS ZENG
     北美CHIHUAHUAN荒漠啮齿动物群落动态Ⅰ.年间变动和趋势
短句来源
     Study on Dynamics of Avian Community in Different Stages of Vegetation Succession in Chongming Dongtan Wetland
     崇明东滩湿地植被演替不同阶段鸟类群落动态变化的研究
短句来源
     DYNAMICD OF THE RODENT COMMUNITY IN THE CHIHUAHUAN DESERT OF NORTH AMERICA Ⅲ.FREQUENCY DISTRIBUTIONS AND PREDICTION OF VARIABLES
     北美CHIHUAHUAN荒漠啮齿动物群落动态Ⅲ.变量的频次分布和预测
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  community dynamics
It is shown that the new approach offers new opportunities in forecasting community dynamics under the effects of natural and anthropogenic factors.
      
The effect of decreasing alkalinity on microbial community dynamics in a sulfate-reducing bioreactor as analyzed by PCR-SSCP
      
PCR-single-strand conformation polymorphism (SSCP) and Southern blotting techniques were adopted to investigate microbial community dynamics in a sulfate-reducing bioreactor caused by decreasing influent alkalinity.
      
Predictions about population and community dynamics are usually based on lab experiments.
      
The Impact of Corporate Strategy on Community Dynamics: A Case Study of the Freeport Mining Company in West Papua, Indonesia
      
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  community dynamic
Two versions of the model wereused: population (yellow perch only) and community(dynamic predation on yellow perch by walleye).
      
Community dynamic models of two dioecious tree species
      
Community dynamic models of two dioecious tree species
      
So different recovery of dominant species lead a different community dynamic in each area.
      
  dynamics of community
In a second experiment, created habitat patches were sampled over time intervals ranging from 1?day to 36?days to examine temporal dynamics of community assembly.
      
This goal has been recognized not only for its relevance in defining the dynamics of community composition, but for enabling physiological studies of competitive species and inferring their impact on the microbial food web.
      
In our paper we will try to connect the dynamics of community decline to individual responses.
      
Within the dynamics of community safety and crime control practices there are dangers that 'security differentials' may become increasingly significant characteristics of wealth and status with implications for social exclusion.
      
Seasonal dynamics of community structure greatly differed among bacterial fractions and lakes.
      
更多          
  dynamic of community
Techno-optimists often focus on geography as a dynamic of community that the Internet will change.
      
  其他


The structure and ecological significances of the subtropical evergreen forest differ from those of the tropical rain forest in many aspects, chiefly in the former's lack of buttresses and cauliflories, and in the scarcity of epiphytes and large lia nas. Moreover, its coefficient of community is greater and its minimal area smaller than that of the tropical rain forest. As to the life-forms, they are also different, though a similarity in the coefficient of space exists between the two forest types.Differentiation...

The structure and ecological significances of the subtropical evergreen forest differ from those of the tropical rain forest in many aspects, chiefly in the former's lack of buttresses and cauliflories, and in the scarcity of epiphytes and large lia nas. Moreover, its coefficient of community is greater and its minimal area smaller than that of the tropical rain forest. As to the life-forms, they are also different, though a similarity in the coefficient of space exists between the two forest types.Differentiation of the evergreen forest is not well-defined. According to the data of field surveys this forest remains more complex and appears harmonious in structure, hence it can hardly be classified into distinct associations. The dominant trees distribute extensively over the whole forest, forming the pan-dominants. The characteristic species can be found only in the specific habitate, such as ridges, peaks or forge bottoms. These form additional dominants. This mixed community is one of the primary types of forest, the outgrowth of long-term historical development. At present it is still in a relatvely stable condition.The forest under investigation is a typically subtrcj-ical evergreen fcrest. It consists of floristic elements of subtropical origeji, including the species cf Fcgcccae, Hcmame-lidaceae, Theaceas, Magnoliaceae, Ilex , Styracdceas , Laurdceae , Elaeocarpaceae, Rhododendron and bamboos; all of these are the symbolic elements of the subtropical forest-types. This forest-type is distributing widely not only over the subtropical regions of Eastern Asia, but also on the uplands of the Asian Tropics. It seems thaj they are from the same origin and comprise an organic whole.According to the characteristic species three mixed communities are recognized.1 . Sempervirentisilva + Deciduisilva Mixed Community.2. Sempervirentisilva + Bambusisilva Mixed Community.3 . Sempervirentisilva + Acfculisilva Mixed Community.

亚热带常绿林比起热带雨林有许多差异。它缺乏具板根和茎花的植物,也罕见附生植物及大藤本。它的群落相同系数较大,最小面积则较小,生活型亦有不同,只有空间系数较大。 莽山常绿林的分化现象不很明显,是一个在结构上较为均一的混合常绿林,群落间的界线不易划分,建群种普遍存在于整个森林,只在特殊的环境如山脊和沟谷才有附加的特征种。这种混合的常绿林是一种原生性的森林类型,是长期历史发展的产物,目前仍处在比较稳定的状态。 莽山常绿林是典型的亚热带常绿林。它是由亚热带起源的植物区系成分所组成。这个森林类型在东亚的亚热带地区普遍存在,并且具有共同的起源,而且是统一的整体。 莽山是南岭山地海拔最高的山体,长期以来一直保存着大片的常绿林,是典型的亚热带常绿林。本文将就它的结构、生活型、生态型及群落动态等方面进行分析,探讨我国亚热带常绿林的各种特征。

Da Xue Mountaia of ZhenKang County is situated in 24°20' N and 99° 6' E, the south-west part of Yunnan Province. The altitude from vally to peak is about 2000 m (1700 m to 3500 m). The evergreen broad-leaf forest is mainly 'ocated between 2000 m and 2500 m. It is well preserved, and is a kind of representive of mountain humid evergreen broad-leaf forget in subtropical region.

云南镇康县大雪山常绿阔叶林,分布面积大,保存较完整,是一类有代表性的中山湿性常绿阔叶林,本文是在划分群落类型的基础上,进一步分析了常绿阔叶林的外貌、结构、植物种类成分、生境,以及林冠下乔木树种天然更新和群落动态的一些基本特征。 该地区的常绿阔叶林分布较南,山体较高、地形变化多样,生境湿润,土壤肥沃,群落结构复杂,树种资源和附生苔藓植物均较丰富。乔木层优势树种明显,林下形成竹子层片,单位面积上木材蓄积量较高。这类植被在自然保护和生产实践上有着重要的价值。

This paper reports that in 1962 there were one hundred and eightyfive species of birds in the suburbs of Lanzhou. They were found to belong to 16 orders and 39 families. There were 114(92+22)species in 1981-1982, they were found to belong to 14 orders and 32(31+1) families. According to the classification 2 orders and 8 families of birds were decreased against 1962, and a new family (Glareolidae) increased.Of existing birds only 92 species are just the same as in 1962, making up 49.72% of the total in 1962....

This paper reports that in 1962 there were one hundred and eightyfive species of birds in the suburbs of Lanzhou. They were found to belong to 16 orders and 39 families. There were 114(92+22)species in 1981-1982, they were found to belong to 14 orders and 32(31+1) families. According to the classification 2 orders and 8 families of birds were decreased against 1962, and a new family (Glareolidae) increased.Of existing birds only 92 species are just the same as in 1962, making up 49.72% of the total in 1962. Other 22 new records are found to be 19.29% of existing birds.Accoraingto the feeding analysis of the decrease and increase of the birds in the suburbs of Lanzhou from 1962—1982, it may be seen that the rough trend of the past twenty years on the bird community succession in the suburds of Lanzhou is as follows: The birds of feeding on fish had remarkablly decreased; those of feeding on mice and omnivorous birds had decreased also; and those of feeding on seeds and insectivorous birds had increased in varying degrees.There are nearly twenty hunting-birds which have economic value. among the 93 species decreased, and the middle-sized and small—sized insectivorous birds have greatly decreased also.The main reasons of these phenomena are the environmental change, the pollution of the environment and indiscriminate catching and killing.The paper puts forward a proposal at last. In order to renew bird′s resources, we should try to attract the beneficial birds to stay here. In the firstplace, we must attract Swallows、Tits、 Swifts、Starlings and sc on.

本文根据1981—1982年全年在兰州市郊所采鸟类并与1962年以前在相同范围内所集鸟类对比,作出群落动态分析和益害评价。文章认为;廿年来,兰州市郊鸟类种类总的来说是减少了,引起这种减少的原因固然很多,但主要是环境污染和人为的干扰,使本来能为人类提供肉食或消灭害虫的一部分鸟类失去了应有的作用,为人类带来巨大损关。应采取生态措施,植树造林悬挂巢箱招引益鸟,使其为农林、园艺和卫生保健事业服务。

 
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